Relevant bibliographies by topics / Paleontology - India / Journal articles
To see the other types of publications on this topic, follow the link: Paleontology - India.

Journal articles on the topic 'Paleontology - India'

Author: Grafiati
Published: 4 June 2021
Last updated: 8 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Paleontology - India.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Agnihotri, Deepa, Jorge F. Genise, Anju Saxena, and A. K. Srivastava. "Palliedaphichnium gondwanicum new ichnogenus new ichnospecies, a millipede trace fossil from paleosols of the upper Permian Gondwana sequence of India." Journal of Paleontology 95, no. 5 (2021): 906–12. http://dx.doi.org/10.1017/jpa.2021.38.

Full text
Abstract:
AbstractThe new invertebrate trace fossil from paleosols of the Bijori Formation, Palliedaphichnium gondwanicum new ichnogenus new ichnospecies, which belongs to an upper Permian Gondwana sequence of India, makes a significant contribution to the meager records of invertebrate trace fossils from Permian and Indian paleosols. This trace fossil attributed to Diplopoda and composed of tunnels and chambers filled with pellets is also an important addition to the scarce record of Permian millipedes. The abundance of plant remains in the same paleosol indicates that these millipedes probably fed on leaf litter as other fossil and extant representatives. Chambers and abundant pellets in burrows indicate adverse conditions on the surface, at least seasonally. This finding contributes to the emerging scenario of invertebrate ichnofaunas from paleosols and points to a successive dominance of millipedes during the Paleozoic, crayfishes and earthworms in the Mesozoic, and insects in the Cenozoic.UUID: http://zoobank.org/4378c739-9bd1-4382-b084-e2176045e209
APA, Harvard, Vancouver, ISO, and other styles
2

Bose, Kanishka, Shiladri S. Das, and Subhronil Mondal. "An updated generic classification of Cenozoic pleurotomariid gastropods, with new records from the Oligocene and early Miocene of India." Journal of Paleontology 95, no. 4 (2021): 763–76. http://dx.doi.org/10.1017/jpa.2021.4.

Full text
Abstract:
AbstractAlthough taxonomically distinct, the Cenozoic pleurotomariids are the bottlenecked remnants of the Mesozoic members of the family in terms of morphology, with only conical forms surviving the end-Cretaceous mass extinction. Here, we propose an updated classification scheme for the Cenozoic representatives of this group, based on data from the entire Cenozoic pleurotomariid fossil record. We consider all conventional as well as several new characters so that this scheme can readily help to distinguish Cenozoic pleurotomariid genera. Following the new classification scheme, a revision of the generic status of Cenozoic species previously assigned to ‘Pleurotomaria’ Defrance, 1826 is presented.Only a few Cenozoic pleurotomariid gastropods have been reported from the Indian subcontinent. Here we report four species from the Oligocene of the Kutch Basin and the early Miocene (Burdigalian) of the Dwarka Basin of Gujarat, western India, of which two are described as new: Perotrochus bermotiensis n. sp., Entemnotrochus kathiawarensis n. sp., Entemnotrochus cf. E. bianconii, and Entemnotrochus? sp. 1.UUID: http://zoobank.org/89b6ff67-2834-477f-862b-67691104aca4
APA, Harvard, Vancouver, ISO, and other styles
3

Kathal, P. K. "Taxonomy, distribution patterns and ecology of Recent littoral foraminifera of the east coast of India." Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 224, no. 1 (2002): 115–60. http://dx.doi.org/10.1127/njgpa/224/2002/115.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Sharma, Archana, and Sanjay Singh. "A small assemblage of marine hybodont sharks from the Bathonian of the Jaisalmer Basin, India." Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 301, no. 3 (2021): 317–33. http://dx.doi.org/10.1127/njgpa/2021/1014.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Kaushik, Tushar, Anupam Ghosh, Thirumalai M, and Ishita Das. "Srinivasania Sundarbanensis gen. et sp. nov., a New Agglutinated Benthic Foraminifer from the World's Largest Mangrove Ecoregion, the Sundarbans, India." Journal of Foraminiferal Research 51, no. 2 (2021): 81–91. http://dx.doi.org/10.2113/gsjfr.51.2.81.

Full text
Abstract:
ABSTRACT We describe Srinivasania sundarbanensis n. gen. et sp. nov., a multichambered textulariid foraminifer from the world's largest mangrove ecosystem, the Sundarbans, India. The new genus has an agglutinated wall structure, planispirally coiled test, and a single high-arched equatorial aperture located at the base of the final chamber with a narrow, agglutinated lip and with morphological similarity to the genera GobbettiaDhillon, 1968, and HaplophragmoidesCushman, 1910. Phylogenetic analyses, using partial small subunit rRNA gene, partial large subunit rRNA gene, and concatenated (LSU+SSU) sequence data clearly show the placement of this new taxon among other textulariid foraminifers, distant from all other genera in a strongly supported clade. In the new genus and species, the test is discoidal, measuring 100 to 350 µm in diameter with six to seven chambers in the final whorl. Elemental characterization (SEM-EDS) of the agglutinated test wall reveals a preference for quartz grains (SiO2) to construct its test. It is a common species and is presently known only from the northern marsh environments of Indian Sundarbans.
APA, Harvard, Vancouver, ISO, and other styles
6

Paul, Sharmistha, and Tapas Kumar Gangopadhyay. "Shell concentration stratum of minute viviparid gastropods from Barga Intertrappean Bed, Madhya Pradesh, India – a case study of juvenile mass mortality." Neues Jahrbuch für Geologie und Paläontologie - Abhandlungen 299, no. 3 (2021): 309–18. http://dx.doi.org/10.1127/njgpa/2021/0971.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Bardhan, Subhendu, Sandip Saha, Shiladri S. Das, and Ranita Saha. "Paleoecology of naticid–molluscan prey interaction during the Late Jurassic (Oxfordian) in Kutch, India: evolutionary implications." Journal of Paleontology 95, no. 5 (2021): 974–93. http://dx.doi.org/10.1017/jpa.2021.24.

Full text
Abstract:
AbstractWe document and quantify one of the oldest predator–prey interactions between naticid gastropods and molluscan prey, on the basis of drill holes in shells, from the Late Jurassic (Oxfordian) beds of Kutch, western India. Previously, many workers recorded naticid-like drill holes on prey taxa from the Triassic and the Jurassic, but in the absence of associated naticid body fossils, they remained equivocal.The present gastropod community is dominated by turritellines (98% of the sample) that form the turritelline-dominated assemblage, and the naticid drilling predation is restricted almost entirely to turritellines among gastropods. Confamilial naticid predation takes place occasionally. Within the bivalve community, corbulids and nuculids are most abundant and are drilled more often than other taxa. These observations indicate that prey selection was opportunistic and based solely on availability. Drilling intensities at both assemblage and lower taxon levels are low. Behavioral stereotypy of naticid predation in some cases is moderately high.Turritellines are often the preferred prey of naticid gastropods since the late Early Cretaceous. These two groups form a recurrent association reflecting prey–predator interaction. Here we suggest that both turritellines and naticids evolved during the Jurassic, and the prey–predator interaction between them was established shortly thereafter. Among bivalves, corbulids also became important prey of naticids in the same spatiotemporal framework. Corbulids are older than naticids and first appeared during the Middle Jurassic. After their first encounter with naticids, corbulids evolved conchiolin layers within the valves to resist predation.
APA, Harvard, Vancouver, ISO, and other styles
8

Kshetrimayum, Deepak Singh, Varun Parmar, Ranjit Singh Lourembam, and Guntupalli V. R. Prasad. "A diversified Ostracoda (Crustacea) assemblage from the Upper Cretaceous intertrappean beds of Gujri, Dhar District, Madhya Pradesh, India." Cretaceous Research 124 (August 2021): 104784. http://dx.doi.org/10.1016/j.cretres.2021.104784.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Khanolkar, Sonal, Tathagata Roy Choudhury, Pratul Kumar Saraswati, and Santanu Banerjee. "Late Paleocene-Early Eocene Foraminiferal Assemblage and Carbon Isotope Excursion Indicating Hyperthermal Events in Paleotropical Succession of Northwestern India." Journal of Foraminiferal Research 51, no. 1 (2021): 4–13. http://dx.doi.org/10.2113/gsjfr.51.1.4.

Full text
Abstract:
ABSTRACT This study focuses on marine sediments of the late Paleocene-early Eocene (∼55.5–49 Ma) interval from the Jaisalmer Basin of western India. It demarcates the Paleocene Eocene Thermal Maximum (PETM) using foraminiferal biostratigraphy and carbon isotope stratigraphy. A negative carbon isotope excursion of 4.5‰ delineates the PETM within the basin. We demarcate five foraminiferal biofacies using the detrended correspondence analysis. These reflect characteristics of ecology, bathymetry, relative age, and environment of deposition of the foraminifera. They record the response of foraminifera to the warmth of the PETM. Biofacies A was deposited within an inner neritic setting ∼55.5 Ma and includes benthic foraminifera Haplophragmoides spp., Ammobaculites spp., and Lenticulina spp. The presence of Pulsiphonina prima and Valvulineria scorbiculata in Biofacies B suggests an increase in runoff conditions in the basin. Fluctuating trophic conditions prevailed between ∼54–50 Ma. It is evidenced by alternating Biofacies C (endobenthic and chiloguembelinids of eutrophic conditions) and Biofacies D (epibenthic and acarininids of oligotrophic conditions). Biofacies E is dominated by deep-dwelling parasubbotinids, indicating an increase in bathymetry, possibly corresponding to the Early Eocene Climatic Optimum (∼49 Ma).
APA, Harvard, Vancouver, ISO, and other styles
10

Samant, Bandana, Roberto Pronzato, Dhananjay Mahendrakumar Mohabey, et al. "Insight into the evolutionary history of freshwater sponges: A new genus and new species of Spongillida (Porifera: Demospongiae) from Upper Cretaceous (Maastrichtian) Deccan intertrappean lacustrine deposits of the Malwa Group, Central India." Cretaceous Research 126 (October 2021): 104851. http://dx.doi.org/10.1016/j.cretres.2021.104851.

Full text
APA, Harvard, Vancouver, ISO, and other styles
11

Singh, Birendra P., Jinliang Yuan, Om N. Bhargava, et al. "A new stratigraphic occurrence of the taxon Pagetia (Trilobita) from the Spiti region and its biostratigraphic significance in correlation of the Wuliuan Stage (Miaolingian Series) in the Kashmir and the Spiti regions (Tethyan Himalaya), India." Annales de Paléontologie 107, no. 3 (2021): 102506. http://dx.doi.org/10.1016/j.annpal.2021.102506.

Full text
APA, Harvard, Vancouver, ISO, and other styles
12

Sonar, Mohan A., Dnyaneshwar V. Wayal, and Ramesh M. Badve. "Lepraliomorph bryozoans from Holocene deposits along the Konkan Coast of Western India." Alcheringa: An Australasian Journal of Palaeontology 45, no. 2 (2021): 274–87. http://dx.doi.org/10.1080/03115518.2021.1916836.

Full text
APA, Harvard, Vancouver, ISO, and other styles
13

Singh, Y. Raghumani, Mark B. Abbott, T. Elliot Arnold, and Sh Priyokumar Singh. "Early Eocene palynofloras and geochemistry from the Garo Hills in Meghalaya (India)." Review of Palaeobotany and Palynology 292 (September 2021): 104458. http://dx.doi.org/10.1016/j.revpalbo.2021.104458.

Full text
APA, Harvard, Vancouver, ISO, and other styles
14

Parker, Sarah E., Sandy P. Harrison, Laia Comas-Bru, Nikita Kaushal, Allegra N. LeGrande, and Martin Werner. "A data–model approach to interpreting speleothem oxygen isotope records from monsoon regions." Climate of the Past 17, no. 3 (2021): 1119–38. http://dx.doi.org/10.5194/cp-17-1119-2021.

Full text
Abstract:
Abstract. Reconstruction of past changes in monsoon climate from speleothem oxygen isotope (δ18O) records is complex because δ18O signals can be influenced by multiple factors including changes in precipitation, precipitation recycling over land, temperature at the moisture source, and changes in the moisture source region and transport pathway. Here, we analyse >150 speleothem records of the Speleothem Isotopes Synthesis and AnaLysis (SISAL) database to produce composite regional trends in δ18O in monsoon regions; compositing minimises the influence of site-specific karst and cave processes that can influence individual site records. We compare speleothem δ18O observations with isotope-enabled climate model simulations to investigate the specific climatic factors causing these regional trends. We focus on differences in δ18O signals between the mid-Holocene, the peak of the Last Interglacial (Marine Isotope Stage 5e) and the Last Glacial Maximum as well as on δ18O evolution through the Holocene. Differences in speleothem δ18O between the mid-Holocene and the Last Interglacial in the East Asian and Indian monsoons are small, despite the larger summer insolation values during the Last Interglacial. Last Glacial Maximum δ18O values are significantly less negative than interglacial values. Comparison with simulated glacial–interglacial δ18O shows that changes are principally driven by global shifts in temperature and regional precipitation. Holocene speleothem δ18O records show distinct and coherent regional trends. Trends are similar to summer insolation in India, China and southwestern South America, but they are different in the Indonesian–Australian region. Redundancy analysis shows that 37 % of Holocene variability can be accounted for by latitude and longitude, supporting the differentiation of records into individual monsoon regions. Regression analysis of simulated precipitation δ18O and climate variables show significant relationships between global Holocene monsoon δ18O trends and changes in precipitation, atmospheric circulation and (to a lesser extent) source area temperature, whereas precipitation recycling is non-significant. However, there are differences in regional-scale mechanisms: there are clear relationships between changes in precipitation and δ18O for India, southwestern South America and the Indonesian–Australian regions but not for the East Asian monsoon. Changes in atmospheric circulation contribute to δ18O trends in the East Asian, Indian and Indonesian–Australian monsoons, and a weak source area temperature effect is observed over southern and central America and Asia. Precipitation recycling is influential in southwestern South America and southern Africa. Overall, our analyses show that it is possible to differentiate the impacts of specific climatic mechanisms influencing precipitation δ18O and use this analysis to interpret changes in speleothem δ18O.
APA, Harvard, Vancouver, ISO, and other styles
15

Pausata, Francesco S. R., Gabriele Messori, Jayoung Yun, Chetankumar A. Jalihal, Massimo A. Bollasina, and Thomas M. Marchitto. "The remote response of the South Asian Monsoon to reduced dust emissions and Sahara greening during the middle Holocene." Climate of the Past 17, no. 3 (2021): 1243–71. http://dx.doi.org/10.5194/cp-17-1243-2021.

Full text
Abstract:
Abstract. Previous studies based on multiple paleoclimate archives suggested a prominent intensification of the South Asian Monsoon (SAM) during the mid-Holocene (MH, ∼6000 years before present). The main forcing that contributed to this intensification is related to changes in the Earth's orbital parameters. Nonetheless, other key factors likely played important roles, including remote changes in vegetation cover and airborne dust emission. In particular, northern Africa also experienced much wetter conditions and a more mesic landscape than today during the MH (the so-called African Humid Period), leading to a large decrease in airborne dust globally. However, most modeling studies investigating the SAM changes during the Holocene overlooked the potential impacts of the vegetation and dust emission changes that took place over northern Africa. Here, we use a set of simulations for the MH climate, in which vegetation over the Sahara and reduced dust concentrations are considered. Our results show that SAM rainfall is strongly affected by Saharan vegetation and dust concentrations, with a large increase in particular over northwestern India and a lengthening of the monsoon season. We propose that this remote influence is mediated by anomalies in Indian Ocean sea surface temperatures and may have shaped the evolution of the SAM during the termination of the African Humid Period.
APA, Harvard, Vancouver, ISO, and other styles
16

Pokharia, Anil K., Shalini Sharma, Y. S. Rawat, Alka Srivastava, Bhushan Dighe, and P. C. Pande. "Rice, beans and pulses at Vadnagar: An early historical site with a Buddhist monastery in Gujarat, western India." Geobios 64 (February 2021): 77–91. http://dx.doi.org/10.1016/j.geobios.2020.12.002.

Full text
APA, Harvard, Vancouver, ISO, and other styles
17

Zhang, Qinghai, Helmut Willems, Lin Ding, Kai-Uwe Gräfe, and Erwin Appel. "Initial India-Asia Continental Collision and Foreland Basin Evolution in the Tethyan Himalaya of Tibet: Evidence from Stratigraphy and Paleontology." Journal of Geology 120, no. 2 (2012): 175–89. http://dx.doi.org/10.1086/663876.

Full text
APA, Harvard, Vancouver, ISO, and other styles
18

Rana, Rajendra Singh, Mohd Waqas, Maeva Orliac, Annelise Folie, and Thierry Smith. "A new basal raoellid artiodactyl (Mammalia) from the middle Eocene Subathu Group of Rajouri District, Jammu and Kashmir, northwest Himalaya, India." Geobios 66-67 (July 2021): 193–206. http://dx.doi.org/10.1016/j.geobios.2020.12.003.

Full text
APA, Harvard, Vancouver, ISO, and other styles
19

Braconnot, Pascale, Samuel Albani, Yves Balkanski, et al. "Impact of dust in PMIP-CMIP6 mid-Holocene simulations with the IPSL model." Climate of the Past 17, no. 3 (2021): 1091–117. http://dx.doi.org/10.5194/cp-17-1091-2021.

Full text
Abstract:
Abstract. We investigate the climate impact of reduced dust during the mid-Holocene using simulations with the IPSL model. We consider simulations where dust is either prescribed from an IPSL PI simulation or from CESM simulations (Albani et al., 2015). In addition, we also consider an extreme mid-Holocene case where dust is suppressed. We focus on the estimation of the dust radiative effects and the relative responses of the African and Indian monsoon, showing how local dust forcing or orography affect atmospheric temperature profiles, humidity and precipitation. The simulated mid-Holocene climate is statistically different in many regions compared to previous mid-Holocene simulations with the IPSL models. However, it translates to only minor improvements compared to palaeoclimate reconstructions, and the effect of dust has little impact on mid-Holocene model skill over large regions. Our analyses confirm the peculiar role of dust radiative effect over bright surfaces such as African deserts compared to other regions, brought about by the change of sign of the dust radiative effect at the top of atmosphere for high surface albedo. We also highlight a strong dependence of results on the dust pattern. In particular, the relative dust forcing between West Africa and the Middle East impacts the relative climate response between India and Africa and between Africa, the western tropical Atlantic and the Atlantic meridional circulation. It also affects the feedback on the Atlantic Ocean thermohaline circulation. Dust patterns should thus be better constrained to fully understand the changes in the dust cycle and forcing during the mid-Holocene, which also informs on the potential changes in key dust feedbacks in the future.
APA, Harvard, Vancouver, ISO, and other styles
20

Quamar, Mohammad Firoze, Ratan Kar, and Biswajeet Thakur. "Vegetation response to the Indian Summer Monsoon (ISM) variability during the Late-Holocene from the central Indian core monsoon zone." Holocene 31, no. 7 (2021): 1197–211. http://dx.doi.org/10.1177/09596836211003191.

Full text
Abstract:
Pollen analysis and radiocarbon dating of a 1.4 m deep lacustrine sediment profile from Chhattisgarh State, central India, in the core monsoon zone (CMZ), has revealed the vegetation history, associated climate change and the Indian Summer Monsoon (ISM) rainfall variability during the Late-Holocene. The pollen evidence suggests that between ca. 3000 and 2600 cal year BP, tree-savannah vegetation occurred in the region having a comparatively lesser monsoon rainfall. The forest expanded and culminated into an open-mixed tropical deciduous forest between ca. 2600 and 2200 cal year BP under a warm and moderately humid climate with an increase in monsoon rainfall. Subsequently, between ca. 2200 and 2000 cal year BP, the existing open-mixed tropical deciduous forest transformed into a mixed tropical deciduous forest under a warm and humid climate with further increase in monsoon rainfall. Finally, between ca. 2000 and 1800 cal year BP, a dense mixed tropical deciduous forest occupied the landscape under a regime of a warm and relatively more humid climate with further strengthening of the ISM. The gradual warming, and the climatic amelioration with the intensification of the ISM, during the Late-Holocene (ca. 2600–1800 cal year BP; ~650 BC to AD150) corresponds to the Roman Warm Period (RWP), recorded globally between 2500 and1600 cal year BP (~550 BC to AD ~350). Human activities were present around the study area, which varied according to the ISM variations. The present study provides insights into the gradual intensification of the monsoon since the last ca. 2600 cal year BP (between ca. 2600 and1800 cal year BP), and an increase in the ISM strength in the CMZ of India, against the generally weakening trend during the Late-Holocene.
APA, Harvard, Vancouver, ISO, and other styles
21

Huo, Yiling, William Richard Peltier, and Deepak Chandan. "Mid-Holocene monsoons in South and Southeast Asia: dynamically downscaled simulations and the influence of the Green Sahara." Climate of the Past 17, no. 4 (2021): 1645–64. http://dx.doi.org/10.5194/cp-17-1645-2021.

Full text
Abstract:
Abstract. Proxy records suggest that the Northern Hemisphere during the mid-Holocene (MH), to be assumed herein to correspond to 6000 years ago, was generally warmer than today during summer and colder in the winter due to the enhanced seasonal contrast in the amount of solar radiation reaching the top of the atmosphere. The complex orography of both South and Southeast Asia (SA and SEA), which includes the Himalayas and the Tibetan Plateau (TP) in the north and the Western Ghats mountains along the west coast of India in the south, renders the regional climate complex and the simulation of the intensity and spatial variability of the MH summer monsoon technically challenging. In order to more accurately capture important regional features of the monsoon system in these regions, we have completed a series of regional climate simulations using a coupled modeling system to dynamically downscale MH global simulations. This regional coupled modeling system consists of the University of Toronto version of the Community Climate System Model version 4 (UofT-CCSM4), the Weather Research and Forecasting (WRF) regional climate model, and the 3D Coastal and Regional Ocean Community model (CROCO). In the global model, we have taken care to incorporate Green Sahara (GS) boundary conditions in order to compare with standard MH simulations and to capture interactions between the GS and the monsoon circulations in India and SEA. Comparison of simulated and reconstructed climates suggest that the dynamically downscaled simulations produce significantly more realistic anomalies in the Asian monsoon than the global climate model, although they both continue to underestimate the inferred changes in precipitation based upon reconstructions using climate proxy information. Monsoon precipitation over SA and SEA is also greatly influenced by the inclusion of a GS, with a large increase particularly being predicted over northern SA and SEA, and a lengthening of the monsoon season. Data–model comparisons with downscaled simulations outperform those with the coarser global model, highlighting the crucial role of downscaling in paleo data–model comparison.
APA, Harvard, Vancouver, ISO, and other styles
22

Kumar Das, Supriyo, Kaushik Gangopadhyay, Ahana Ghosh, et al. "Organic geochemical and palaeobotanical reconstruction of a late-Holocene archaeological settlement in coastal eastern India." Holocene 31, no. 10 (2021): 1511–24. http://dx.doi.org/10.1177/09596836211025970.

Full text
Abstract:
Integration of palaeobotanical (spores, pollen, phytoliths and non-pollen palynomorphs) and organic geochemical proxies, such as stable isotopes of organic carbon (δ13C) and n-alkanes, for studying the evolution and palaeoenvironmental conditions of an archaeological site are rare in India. The evolution of a protohistoric-historic site at Erenda, situated in the eastern coastal region of India, has been studied by using multiple palaeobotanical and organic geochemical proxies assisted with AMS radiocarbon dates. The excavated site lies above Late Pleistocene–Early Holocene Sijua Formation. The absence of anthropogenic evidence in the Sijua Formation likely indicates inhabitable conditions in nearshore/estuarine marshy conditions. The earliest human settlements at the excavation site begin during the first millennium BCE after the initiation of habitable conditions along the coast. The presence of fungal spores and the dominance of C4 phytolith morphotypes indicate prevailing warm and humid climatic conditions and proximity to a freshwater body. The δ13C signature and n-alkane composition indicate the use of C4 grass for the construction of the mud and clay-built huts. The settlers most likely used to consume wild or domestic variety of rice, as evidenced by the presence of bilobate scooped morphotypes. The site was partly abandoned, covered with C3 and C4 vegetation and used as a dumping ground after 663 ± 92 BCE. This implies that people continued to live in the area but possibly moved to a nearby site while using the excavated site as refuse.
APA, Harvard, Vancouver, ISO, and other styles
23

Jones, Penelope J., Tamsin C. O’Connell, Martin K. Jones, RN Singh, and Cameron A. Petrie. "Crop water status from plant stable carbon isotope values: A test case for monsoonal climates." Holocene 31, no. 6 (2021): 993–1004. http://dx.doi.org/10.1177/0959683621994649.

Full text
Abstract:
Stable carbon isotope analysis is increasingly used in archaeology as an indicator of crop water status and/or water management regime. While the technique shows promise, robust modern baseline studies are required to inform and validate archaeological interpretations. Here, we test stable carbon isotope values as a crop water status proxy in a monsoonal climatic context for the first time. Specifically, we test the relationship between grain stable carbon isotope values (δ13Cgrain), water availability, irrigation and soil type in barley ( Hordeum vulgare L. (Zohary and Hopf.)) in north-west India, with the aim of deriving a locally-appropriate model for isotopic interpretation. We test this relationship across a substantial rainfall gradient (200–1000 mm/year) and find a negative logarithmic relationship between climatic water availability and δ13C. However, there is significant noise in the relationship, and we report δ13Cgrain variation of over 3‰ amongst samples drawn from similar climatic contexts. Soil type, irrigation type and irrigation frequency have no clear modifying effects. We conclude that: (1) barley stable carbon isotope values can act as an archaeological water status proxy in monsoonal areas, but will be most sensitive in areas receiving <450 mm rainfall per year; and (2) it is not possible to precisely infer water management regimes. On the basis of our results, we propose guidelines for archaeological barley stable carbon isotope interpretation in north-west India and analogous monsoonal climates.
APA, Harvard, Vancouver, ISO, and other styles
24

BHATTACHERJEE, MADHURA, DEVAPRIYA CHATTOPADHYAY, BIDISHA SOM, AMMU S. SANKAR, and SATYAKI MAZUMDER. "MOLLUSCAN LIVE-DEAD FIDELITY OF A STORM-DOMINATED SHALLOW-MARINE SETTING AND ITS IMPLICATIONS." PALAIOS 36, no. 2 (2021): 77–93. http://dx.doi.org/10.2110/palo.2020.020.

Full text
Abstract:
ABSTRACT Actualistic studies are important for evaluating the fidelity of fossil assemblages in representing the living community. Poor live-dead (LD) fidelity in molluscan assemblages may result from transport-induced mixing. Large-scale mixing is more common in siliciclastic settings with a narrow shelf, high sedimentation rate, and those that are frequented by episodically high-energy events. Chandipur-on-sea, on the east coast of India has an optimal setting to promote such conditions. By studying the LD fidelity and modeling size-frequency distribution (SFD) of the fauna, we attempted to evaluate the contribution of “out-of-habitat” versus “within-habitat” mixing in developing the molluscan death assemblage. The correlation between the composition of live (LA) and death assemblages (DA) was insufficient; unlike LAs, the DAs do not show environmental partitioning in ordination space. A numerical simulation of the shell size frequency distribution (SFD) for DAs from LAs was compared with the observed SFD of the DAs. The results of this simulation indicate that DAs are not likely to be a product of within-habitat mixing. DAs probably received considerable input via regional transport, facilitated by frequent tropical cyclones affecting the coast of Odisha. Chandipur receives a large proportion of cyclones originating above 15°N, which causes a high degree of lateral transport and shell mixing between 15° to 21°N, explained by the high compositional similarity of species within this latitudinal extent. Our study highlights the significance of out-of-habitat transport in shaping the regional distribution of marine fossil assemblages, especially in storm dominated siliciclastic shallow-marine settings.
APA, Harvard, Vancouver, ISO, and other styles
25

Roy Choudhury, Tathagata, Santanu Banerjee, Sonal Khanolkar, Pratul Kumar Saraswati, and Sher Singh Meena. "Glauconite authigenesis during the onset of the Paleocene-Eocene Thermal Maximum: A case study from the Khuiala Formation in Jaisalmer Basin, India." Palaeogeography, Palaeoclimatology, Palaeoecology 571 (June 2021): 110388. http://dx.doi.org/10.1016/j.palaeo.2021.110388.

Full text
APA, Harvard, Vancouver, ISO, and other styles
26

Kumar, Jitendra, Krishan Mohan Rai, Shahryar F. Kianian, and Sudhir P. Singh. "Study of Triticum aestivum Resistome in Response to Wheat dwarf India Virus Infection." Life 11, no. 9 (2021): 955. http://dx.doi.org/10.3390/life11090955.

Full text
Abstract:
Susceptible and resistant germplasm respond differently to pathogenic attack, including virus infections. We compared the transcriptome changes between a resistant wheat cultivar, Sonalika, and a susceptible cultivar, WL711, to understand this process in wheat against wheat dwarf India virus (WDIV) infection. A total of 2760 and 1853 genes were differentially expressed in virus-infected and mock-inoculated Sonalika, respectively, compared to WL711. The overrepresentation of genes involved in signaling, hormone metabolism, enzymes, secondary metabolites, proteolysis, and transcription factors was documented, including the overexpression of multiple PR proteins. We hypothesize that the virus resistance in Sonalika is likely due to strong intracellular surveillance via the action of multiple PR proteins (PR1, RAR1, and RPM1) and ChiB. Other genes such as PIP1, LIP1, DnaJ, defensins, oxalate oxidase, ankyrin repeat protein, serine-threonine kinase, SR proteins, beta-1,3-glucanases, and O-methyltransferases had a significant differential expression and play roles in stress tolerance, may also be contributing towards the virus resistance in Sonalika. In addition, we identified putative genes with unknown functions, which are only expressed in response to WDIV infection in Sonalika. The role of these genes could be further validated and utilized in engineering resistance in wheat and other crops.
APA, Harvard, Vancouver, ISO, and other styles
27

Bhattacharya, Sharmila, Yadav Ankit, Srikanta Murthy, and Vasudev Kushwaha. "Biotic response to environmental shift during the Permian-Triassic transition: Assessment from organic geochemical proxies and palynomorphs in terrestrial sediments from Raniganj Sub-basin, India." Palaeogeography, Palaeoclimatology, Palaeoecology 576 (August 2021): 110483. http://dx.doi.org/10.1016/j.palaeo.2021.110483.

Full text
APA, Harvard, Vancouver, ISO, and other styles
28

Mishra, Shreya, Suryendu Dutta, Vikram Partap Singh, Sumit Kumar, Runcie Paul Mathews, and Neerja Jha. "A new acritarch spike of Leiosphaeridia dessicata comb. nov. emend. from the Upper Permian and Lower Triassic sequence of India (Pranhita-Godavari Basin): Its origin and palaeoecological significance." Palaeogeography, Palaeoclimatology, Palaeoecology 567 (April 2021): 110274. http://dx.doi.org/10.1016/j.palaeo.2021.110274.

Full text
APA, Harvard, Vancouver, ISO, and other styles
29

Bagla, P. "PALEONTOLOGY: Team Rejects Claim of Early Indian Fossils." Science 289, no. 5483 (2000): 1273a—1273. http://dx.doi.org/10.1126/science.289.5483.1273a.

Full text
APA, Harvard, Vancouver, ISO, and other styles
30

Liu, Pengju, Shuhai Xiao, Chongyu Yin, Shouming Chen, Chuanming Zhou, and Meng Li. "Ediacaran Acanthomorphic Acritarchs and Other Microfossils from Chert Nodules of the Upper Doushantuo Formation in the Yangtze Gorges Area, South China." Journal of Paleontology 88, S72 (2014): 1–139. http://dx.doi.org/10.1666/13-009.

Full text
Abstract:
Silicified microfossils preserved in chert nodules of the Doushantuo Formation in the Yangtze Gorges area of South China have great potential to improve the biostratigraphic subdivision and correlation of the Ediacaran System. This potential can be realized only if solid taxonomy is available. However, a systematic treatment of these microfossils (particularly acanthomorphic acritarchs) is lacking, greatly limiting their biostratigraphic potential. This paper presents the systematic paleontology of silicified microfossils from upper Doushantuo Formation (Member III) chert nodules at three sections in the Yangtze Gorges area. More than 90 species of microfossils are described, including 66 named taxa of acanthomorphs, seven named taxa of sphaeromorphs, 12 taxa of cyanobacterial filaments and coccoids, four taxa of algal thalli, and two species of tubular microfossils. Several acritarch species, includingAppendisphaera clavan. sp.,Mengeosphaera grandispinan. sp.,M. stegosauriformisn. sp.,Leiosphaeridia, and possiblySinosphaera rupina, are shown to be multicellular organisms, consistent with the proposition that some Ediacaran acritarchs may be diapause eggs of early animals. This study supports the view that theTianzhushania spinosaacanthomorph biozone is unique to the lower Doushantuo Formation in South China (and perhaps its equivalent in northern India) and that Ediacaran acanthomorph assemblages from Australia, Siberia, and East European Platform are younger than theTianzhushania spinosabiozone. It is proposed that the first occurrence ofHocosphaeridium anozos, a species with easily recognizable morphology and wide taphonomic and geographic distributions, be used to define the second Doushantuo acanthomorph biozone succeeding theTianzhushania spinosabiozone. New taxa described in this paper include three new genera (Bispinosphaeran. gen.;Yushengian. gen.; andGranitunican. gen.) and 40 new species:Appendisphaera?brevispinan. sp.,A. clavan. sp.,A.?hemisphaerican. sp.,A. longispinan. sp.,A. setosan. sp.,Bispinosphaera peregrinan. gen. n. sp.,Crinita paucispinosan. sp.,Ericiasphaera densispinan. sp.,Hocosphaeridium dilatatumn. sp.,Knollisphaeridium denticulatumn. sp.,K. longilatumn. sp.,K. obtusumn. sp.,K. parvumn. sp.,Mengeosphaera angustan. sp.,M. bellulan. sp.,M.cf.bellulan. sp.,M. constrictan. sp.,M.?cuspidatan. sp.,M.?gracilisn. sp.,M. grandispinan. sp.,M. latibasisn. sp.,M. miniman. sp.,M. spicatan. sp.,M. spinulan. sp.,M. stegosauriformisn. sp.,M. triangularisn. sp.,M. uniformisn. sp.,Sinosphaera asteriformisn. sp.,Tanarium acusn. sp.,T. elegansn. sp.,T. longitubularen. sp.,T.?minimumn. sp.,T. obesumn. sp.,T. variumn. sp.,Urasphaera fungiformisn. sp.,U. nuptan. sp.,Yushengia ramispinan. gen. n. sp.,Granitunica mcfaddeniaen. gen. n. sp.,Osculosphaera arcelliformisn. sp., andO. membraniferan. sp.
APA, Harvard, Vancouver, ISO, and other styles
31

Liñan, Eladio. "La criptopaleontología en los lapidarios griegos apócrifos." Spanish Journal of Palaeontology 20, no. 2 (2021): 119. http://dx.doi.org/10.7203/sjp.20.2.20550.

Full text
Abstract:
El estudio de los diversos manuscritos griegos referentes a las propiedades de las piedras (lapidarios griegos apócrifos) que han llegado hasta nosotros indica que entre las diferentes clases de piedras descritas se encuentran fósiles y restos pétreos de animales actuales. Los lapidarios constituyen una de las más antiguas denominaciones y descripciones de fósiles y son una fuente fundamental para conocer el significado dado a los fósiles por las culturas antiguas.
APA, Harvard, Vancouver, ISO, and other styles
32

Anan, Haidar Salim. "TAXONOMICAL CONSIDERATIONS, PHYLOGENY, PALEOGEOGRAPHY AND PALEOCLIMATOLOGY OF THE MIDDLE EOCENE (BARTONIAN) PLANKTIC FORAMINIFERA FROM JABAL HAFIT, AL AIN AREA, UNITED ARAB EMIRATES." Earth Sciences Pakistan 4, no. 1 (2020): 10–20. http://dx.doi.org/10.26480/esp.01.2020.10.20.

Full text
Abstract:
The taxonomical consideration, probable phylogeny and stratigraphic significance of twenty-eight middle Eocene (Bartonian) planktic foraminiferal species from the eastern limb of Jabal Hafit, Al Ain area, United Arab Emirates (UAE), Northern Oman Mountains (NOM) are presented, and twenty one of them are illustrated. Identification of these twenty-eight species belonging to ten genera Globoturborotalia, Subbotina, Globigerinatheka, Inordinatosphaera, Orbulinoides, Hantkenina, Acarinina, Morozovelloides, Pseudohastigerina and Turborotalia has led to the recognition of three biostratigraphic zones, in ascending order: Morozovelloides lehneri PRZ (E11), Orbulinoides beckmanni TRZ (E12) and Morozovelloides crassata HOZ (E13). Eight out of the identified species are recorded, in this study, for the first time from Jabal Hafit: Globoturborotalia martini, Subbotina gortanii, S. jacksonensis, S. senni, Globigerinatheca barri, Acarinina praetopilensis, A. punctocarinata and Morozovelloides bandyi. The second or third record of three species from J. Hafit outside its original records are recently documented by the present author: Inordinatosphaera indica, Hantkenina australis and H. compressa. The paleontology, paleoclimatology and paleogeographic distribution of the identified taxa at Jabal Hafit and other Paleogene outcrops in the UAE and Tethys are presented and discussed. The identified fauna emphasis the wide geographic areas in the Tethys, from Atlantic to Indian-Pacific Oceans via Mediterranean.
APA, Harvard, Vancouver, ISO, and other styles
33

Ou, Xiong, Anne Replumaz, and Peter van der Beek. "Contrasting exhumation histories and relief development within the Three Rivers Region (south-east Tibet)." Solid Earth 12, no. 3 (2021): 563–80. http://dx.doi.org/10.5194/se-12-563-2021.

Full text
Abstract:
Abstract. The Three Rivers Region in south-east Tibet represents a transition between the strongly deformed zone around the Eastern Himalayan Syntaxis (EHS) and the less deformed south-east Tibetan Plateau margin in Yunnan and Sichuan. In this study, we compile and model published thermochronometric ages for two massifs facing each other across the Mekong River in the core of the Three Rivers Region (TRR), using the thermo-kinematic code Pecube to constrain their exhumation and relief history. Modelling results for the low-relief (< 600 m), moderate-elevation (∼ 4500 m) Baima Xueshan massif, east of the Mekong River, suggest regional rock uplift at a rate of 0.25 km/Myr since ∼ 10 Ma, following slow exhumation at a rate of 0.01 km/Myr since at least 22 Ma. Estimated Mekong River incision accounts for 30 % of the total exhumation since 10 Ma. We interpret exhumation of the massif as a response to regional uplift around the EHS and conclude that the low relief of the massif was acquired at high elevation (> 4500 m), probably in part due to glacial “buzzsaw-like” processes active at such high elevation and particularly efficient during Quaternary glaciations. Exhumation of the Baima Xueshan is significantly higher (2.5 km since ∼ 10 Ma) than that estimated for the most emblematic low-relief “relict” surfaces of eastern Tibet, where apatite (U–Th) / He (AHe) ages > 50 Ma imply only a few hundreds of metres of exhumation since the onset of the India–Asia collision. The low-relief Baima Xueshan massif, with its younger AHe ages (< 50 Ma) that record significant rock uplift and exhumation, thus cannot be classified as a relict surface. Modelling results for the high-relief, high-elevation Kawagebo massif, to the west of the Mekong, imply a similar contribution of Mekong River incision (25 %) to exhumation but much stronger local rock uplift at a rate of 0.45 km/Myr since at least 10 Ma, accelerating to 1.86 km/Myr since 1.6 Ma. We show that the thermochronometric ages are best reproduced by a model of rock uplift on a kinked westward-dipping thrust striking roughly parallel to the Mekong River, with a steep shallow segment flattening out at depth. Thus, the strong differences in elevation and relief of two massifs are linked to variable exhumation histories due to strongly differing tectonic imprint.
APA, Harvard, Vancouver, ISO, and other styles
34

Bradley, Lawrence. "Dinosaurs and Indians: Fossil Resource Dispossession of Sioux Lands, 1846-1875." American Indian Culture and Research Journal 38, no. 3 (2014): 55–84. http://dx.doi.org/10.17953/aicr.38.3.w4l1q51m13442202.

Full text
Abstract:
The emergence of vertebrate paleontology as an established, scientific discipline can in part be attributed to large vertebrate fossils found on land dispossessed from indigenous populations from around the world. Specifically, geographic locations of the North American continental interior are known to yield fossiliferous stratagraphic sequences. I argue that vertebrate fossils are another natural resource dispossessed from Native peoples within the historical boundaries of Sioux lands. This body of research discusses the physical and geographical evidence of the first quarter-century of fossil dispossession in Indian country between the years 1846 and 1875.
APA, Harvard, Vancouver, ISO, and other styles
35

Miño-Boilini, Ángel R., Esperanza Cerdeño, and Mariano Bond. "Revisión del género toxodon Owen, 1837 (Notoungulata: Toxodontidae) en el Pleistoceno de las provincias dE Corrientes, Chaco y Santa Fe, Argentina." Spanish Journal of Palaeontology 21, no. 2 (2021): 93. http://dx.doi.org/10.7203/sjp.21.2.20483.

Full text
Abstract:
Se realiza una revisión sistemática de los materiales referidos a Toxodontidae (Notoungulata) provenientes del Lujanense (Pleistoceno tardío-Holoceno temprano) de las Provincias de Corrientes y Chaco, Argentina. Previamente, diversos autores habían reconocido en esta área la presencia de los siguientes Toxodontidae: Toxodon gezi, T. cf. T. gezi, T. aguirrei, T. cf. T. platensis, T. gracilis y Toxodon sp. Los resultados obtenidos sugieren que las especies presentes en la Provincia de Corrientes son T. platensis y T. gracilis. En la Provincia de Chaco, los materiales originalmente referidos a T. cf. T. gezi se reconocen como T. platensis. En este sentido, la evidencia indica que T. gezi y T. aguirrei no son especies válidas y deben ser consideradas sinónimos posteriores de T. platensis. Además, en este trabajo, se da a conocer un cráneo bastante completo de T. platensis procedente del Lujanense (Pleistoceno tardío-Holoceno temprano) de la Provincia de Santa Fe.
APA, Harvard, Vancouver, ISO, and other styles
36

Dey, Rikee, Amit K. Ghosh, Ajoy Kumar Bhaumik, Arindam Chakraborty, Stuti Saxena, and Lopamudra Roy. "Late Pliocene to Early Pleistocene Planktonic Foraminifera from Northern Indian Ocean (Andaman and Nicobar Islands): Interpretation on Cooling Event and Ocean Upwelling." Journal of Foraminiferal Research 51, no. 3 (2021): 115–38. http://dx.doi.org/10.2113/gsjfr.51.3.115.

Full text
Abstract:
ABSTRACT Thirty-two planktonic foraminiferal taxa have been identified based on Bright Field microscopic study as well as Scanning Electron Microscopy on the samples collected from the outcrop adjacent to the type section of Neill West Coast Formation at Neil Island of Ritchie's Archipelago, northern Indian Ocean. The planktonic foraminiferal taxa belong to ten genera viz., Dentoglobigerina, Globigerina, Globigerinoides, Globoconella, Globorotalia, Globorotaloides, Globoturborotalita, Neogloboquadrina, Orbulina, and Trilobatus. A number of statistical analyses have been done in addition to taxonomic study to interpret the palaeocenographic scenario. We performed PCA analysis on the foraminiferal content of the samples to test the relatedness. Two biozones have been established by Stratigraphically Constrained Cluster Analysis (CONISS). We used SHEBI (SHE analysis for biozone identification) analysis to precisely demarcate seven biozones. Attempts have been made to decipher the Plio–Pleistocene boundary in the Neill West Coast Formation based on specific zonal markers. The presence of some taxa (e.g., Globoconella inflata, Globigerina bulloides, and Neogloboquadrina pachyderma) indicates the initiation of a cooling event from late Pliocene onwards. An event of ocean upwelling also has been identified based on the presence of Globigerina bulloides, Neogloboquadrina pachyderma, and N. dutertrei from the late Pliocene to early Pleistocene of the northern Indian Ocean that also correlates with palaeoceanographic records known from other upwelling regions.
APA, Harvard, Vancouver, ISO, and other styles
37

Zamora, Samuel, and Imaran A. Rahman. "Nuevos datos sobre el género Sucocystis (Cincta, echinodermata) en el Cámbrico medio de España: implicaciones biostratigráficas y filogenéticas." Spanish Journal of Palaeontology 23, no. 2 (2021): 301. http://dx.doi.org/10.7203/sjp.23.2.20413.

Full text
Abstract:
Se describe nuevo material de carpoideos de la clase Cincta del Cámbrico medio de las Cadenas Ibéricas (España). El material se compone de un ejemplar identificado como perteneciente al género Sucocystis. La longitud de los surcos epitecales y las características del dintel hacen posible diferenciar a Sucocystis sp. A del resto de los Sucocystidae conocidos. El ejemplar procede de la localidad de Mesones de Isuela (Zaragoza) y fue recogido en el techo de la Formación Murero en niveles de la zona de Solenopleuropsis thorali, de edad Languedociense inferior. Esto permite ampliar considerablemente el rango biostratigráfico de este género en nuestro país. La comparación con el material previamente descrito en otras regiones gondwanicas, indica que se trata de uno de los representantes más antiguos del género Sucocystis. Se analiza la importancia de Sucocystis sp. A en la evolución del grupo, ya que se trata del único representante de la Familia Sucocystidae cuyo surco epitecal izquierdo alcanza la placa M2l. Tras comparar la longitud de los surcos epitecales en las distintas especies del género (sensu Friedrich, 1993) se observa una variación importante en número y longitud de los mismos. Esta variación hace proponer a Sucocystis como un grupo parafilético.
APA, Harvard, Vancouver, ISO, and other styles
38

García-Alcalde, Jenaro L. "Iberirhynchiidae nueva familia de rinconélidos ancistrorhynchoideos (braquiópodos) del Ordovícico Medio al Devónico Inferior de Euroamérica y Gondwana." Spanish Journal of Palaeontology 24, no. 2 (2021): 149. http://dx.doi.org/10.7203/sjp.24.2.20353.

Full text
Abstract:
Se propone la nueva Familia Iberirhynchiidae (Ancistrorhynchoidea), para rinconélidos anteriormente incluidos en Trigonirhynchiidae (Rhynchotrematoidea), pero con seudoseptalio, cubierto o no por un conectivo, formado por la unión de las placas crurales con un tabique medio dorsal constituido por láminas superpuestas de concha secundaria, en lugar del típico septo medio trigonirínquido, con finas láminas de calcita granular (mediotest) en la región axial, sobre las que van apareciendo hacia delante láminas de concha secundaria. Se redescribe la especie-tipo de Iberirhynchia, I. santaluciensis, a partir de una numerosa muestra de ejemplares posiblemente topotípicos, varios especimenes de diferentes localidades asturianas y leonesas, y de otra pequeña muestra de material original prestado por el Rijksmuseum van Geologie en Mineralogie de Leiden, Holanda. En esta redescripción se abordan y se resuelven, hasta donde resulta posible, diferentes problemas relacionados con la naturaleza, procedencia y actual lugar de depósito del holotipo y demás tipos de la especie. Se aportan también diferentes observaciones paleoecológicas que muestran el desarrollo alométrico de la concha que, con la edad, crece más en grosor que en longitud. La relativa escasez de epizoos y de señales de reparación de las conchas, indica un medio marino relativamente tranquilo y estable. Hasta ahora, la única especie del género es la tipo, I. santaluciensis. Las formas denominadas Iberirhynchia nargis e Iberirhynchia sp. son verdaderos trigonirínquidos, con septalio convencional, no cubierto.
APA, Harvard, Vancouver, ISO, and other styles
39

Saxena, S., A. Chakraborty, A. K. Ghosh, R. Dey, L. Roy, and J. P. Keshri. "Burdigalian to Early Serravallian Diatom Biostratigraphy from Havelock Island, Northern Indian Ocean." Stratigraphy and Geological Correlation 29, no. 2 (2021): 241–62. http://dx.doi.org/10.1134/s0869593821020064.

Full text
APA, Harvard, Vancouver, ISO, and other styles
40

Leupold, Maike, Miriam Pfeiffer, Takaaki K. Watanabe, et al. "El Niño–Southern Oscillation and internal sea surface temperature variability in the tropical Indian Ocean since 1675." Climate of the Past 17, no. 1 (2021): 151–70. http://dx.doi.org/10.5194/cp-17-151-2021.

Full text
Abstract:
Abstract. The dominant modes of climate variability on interannual timescales in the tropical Indian Ocean are the El Niño–Southern Oscillation (ENSO) and the Indian Ocean Dipole. El Niño events have occurred more frequently during recent decades, and it has been suggested that an asymmetric ENSO teleconnection (warming during El Niño events is stronger than cooling during La Niña events) caused the pronounced warming of the western Indian Ocean. In this study, we test this hypothesis using coral Sr∕Ca records from the central Indian Ocean (Chagos Archipelago) to reconstruct past sea surface temperatures (SSTs) in time windows from the mid-Little Ice Age (1675–1716) to the present. Three sub-fossil massive Porites corals were dated to the 17–18th century (one coral) and the 19–20th century (two corals). Their records were compared with a published modern coral Sr∕Ca record from the same site. All corals were subsampled at a monthly resolution for Sr∕Ca measurements, which were measured using a simultaneous inductively coupled plasma optical emission spectrometer (ICP-OES). Wavelet coherence analysis shows that interannual variability in the four coral records is driven by ENSO, suggesting that the ENSO–SST teleconnection in the central Indian Ocean has been stationary since the 17th century. To determine the symmetry of El Niño and La Niña events, we compiled composite records of positive and negative ENSO-driven SST anomaly events. We find similar magnitudes of warm and cold anomalies, indicating a symmetric ENSO response in the tropical Indian Ocean. This suggests that ENSO is not the main driver of central Indian Ocean warming.
APA, Harvard, Vancouver, ISO, and other styles
41

Villa, Giuliana, Fabio Florindo, Davide Persico, et al. "Integrated calcareous nannofossil and magnetostratigraphic record of ODP Site 709: Middle Eocene to late Oligocene paleoclimate and paleoceanography of the Equatorial Indian Ocean." Marine Micropaleontology 169 (December 2021): 102051. http://dx.doi.org/10.1016/j.marmicro.2021.102051.

Full text
APA, Harvard, Vancouver, ISO, and other styles
42

Jöhnck, Janika, Ann Holbourn, Wolfgang Kuhnt, and Nils Andersen. "Oxygen Isotope Offsets in Deep-Water Benthic Foraminifera." Journal of Foraminiferal Research 51, no. 3 (2021): 225–44. http://dx.doi.org/10.2113/gsjfr.51.3.225.

Full text
Abstract:
ABSTRACT Despite the extensive use of the benthic foraminiferal oxygen isotope composition (δ18O) as a proxy for paleoclimatic reconstructions, uncertainties remain regarding the consistency of interspecies offsets and the environmental factors controlling 18O fractionation. We investigated δ18O offsets of some frequently used Uvigerina, Bulimina, and Cibicidoides species in core top samples from different hydrographic and sedimentary regimes in the South China Sea, Makassar Strait, and Timor Strait/Eastern Indian Ocean. The δ18O values of the epifaunal taxa Cibicidoides mundulus and Cibicidoides wuellerstorfi showed no significant offset in all investigated regions, whereas shallow infaunal Cibicidoides species exhibited higher variability and were less reliable. We found no offsets between species of Uvigerina and Bulimina and assume that these genera can be measured together and/or substituted. Our results show that epifaunal taxa are close to equilibrium with ambient seawater and thus provide more reliable records of past ice volume and/or bottom water temperature variations than infaunal taxa. Offsets among equilibrium calcite, epifaunal taxa, and infaunal taxa are not constant “vital effects” but are influenced by changing gradients in bottom to pore water pH and carbonate ion concentrations that depend on deep-water ventilation and export flux of particulate carbonate and organic carbon. Offsets between epifaunal and infaunal taxa varied between 0.58 and 0.73‰, depending on regional bottom and pore water conditions. Our findings highlight the importance of regional and temporal variations in organic carbon flux/degradation and dissolution of calcite that may lead to slight under- or overestimates of the amplitude of δ18O fluctuations, especially during times of rapidly changing calcite-saturation of bottom and pore water.
APA, Harvard, Vancouver, ISO, and other styles
43

Hayek, Lee-Ann C., Martin A. Buzas, Pamela Buzas-Stephens, and Jeffrey S. Buzas. "On Replicates for Comparing Species Densities in Space and Time." Journal of Foraminiferal Research 51, no. 2 (2021): 92–97. http://dx.doi.org/10.2113/gsjfr.51.2.92.

Full text
Abstract:
ABSTRACT Because benthic foraminifera exhibit spatial heterogeneity, a number of replicates or multiple biological samples are necessary to estimate population densities. In this study, we empirically examine the efficacy of taking four or fewer replicates to differentiate among mean densities in location and time using p-values as a metric for strength of evidence against the null hypothesis of no difference in taxon density. For spatial analyses, four stations along a traverse with four replicates per station were compared with ANOVA within Mission Bay, Texas, using the four most abundant taxa. The p-values for comparing mean densities among stations increased markedly for all taxa, as the number of samples per station decreased from four to two. Using a test level of 0.05, four replicates per station resulted, on average, in significant differences for three of four taxa, three replicates distinguished two of four taxa, and two replicates detected only one difference. For temporal analyses, a single station was sampled in the Indian River Lagoon, Florida, seasonally over four years. Again, p-values increased markedly as the number of samples per station decreased. Using a test level of 0.05, both four- and three-replicate groups were found to separate mean densities among the four years for three of four taxa, two replicates distinguished one taxon, and use of only one replicate could not detect any difference in mean densities among the four years. Based on these and previous field results, we recommend at least four replicates per station for environmental monitoring. However, when examining mean densities within larger ecological entities such as biofacies, just one sample at each station along a single traverse containing four stations in each bay could delineate Mission, Copano, and Mesquite bays in Texas.
APA, Harvard, Vancouver, ISO, and other styles
44

Collareta, Alberto, Marco Merella, Simone Casati, Giovanni Coletti, and Andrea Di Cencio. "Another thermophilic "Miocene survivor" from the Italian Pliocene: A geologically young occurrence of the pelagic eagle ray Aetobatus in the Euro-Mediterranean region." Carnets de géologie (Notebooks on geology) 21, no. 10 (2021): 203–14. http://dx.doi.org/10.2110/carnets.2021.2110.

Full text
Abstract:
Aetobatus (Myliobatiformes: Aetobatidae) is a living genus of eagle rays that occurs in shallow-marine, tropical and subtropical environments of the Atlantic, Pacific, and Indian Oceans. Nowadays, Aetobatus does not inhabit the cool- to warm-temperate European and Mediterranean waters, though it is known from this broad region by virtue of several fossil teeth ranging chronostratigraphically from the lower Palaeogene to the upper Neogene. The present paper reports on a fossil aetobatid tooth discovered in mid-Pliocene (upper Zanclean to lower Piacenzian, 3.82-3.19 Ma) marine deposits exposed in the vicinities of Certaldo (Tuscany, Italy) and identified as belonging to †Aetobatus cf. cappettai. This specimen comprises the youngest occurrence of Aetobatus along the coasts of mainland Europe; furthermore, together with previous finds from roughly coeval deposits of Mallorca (Balearic Islands, Spain), it represents the most recent record of this genus in the whole Euro-Mediterranean region. In light of the environmental preferences of extant Aetobatus spp., our discovery suggests palaeoenvironmental conditions favourable to the persistence of tropical/subtropical taxa of "Miocene survivors" along the Pliocene coasts of Tuscany. In addition, it raises the question of whether or not the Messinian Salinity Crisis really resulted in the complete collapse of the Mediterranean marine biota and in the subsequent recolonisation of the Mediterranean Basin from the adjoining Atlantic waters and/or scattered marginal intrabasinal refugia at the beginning of the Pliocene. The possibility of Aetobatus recolonising the Mediterranean Sea through the Suez Canal in the near future is discussed.
APA, Harvard, Vancouver, ISO, and other styles
45

Crockart, Camilla K., Tessa R. Vance, Alexander D. Fraser, et al. "El Niño–Southern Oscillation signal in a new East Antarctic ice core, Mount Brown South." Climate of the Past 17, no. 5 (2021): 1795–818. http://dx.doi.org/10.5194/cp-17-1795-2021.

Full text
Abstract:
Abstract. Paleoclimate archives, such as high-resolution ice core records, provide a means to investigate past climate variability. Until recently, the Law Dome (Dome Summit South site) ice core record remained one of few millennial-length high-resolution coastal records in East Antarctica. A new ice core drilled in 2017/2018 at Mount Brown South, approximately 1000 km west of Law Dome, provides an additional high-resolution record that will likely span the last millennium in the Indian Ocean sector of East Antarctica. Here, we compare snow accumulation rates and sea salt concentrations in the upper portion (∼ 20 m) of three Mount Brown South ice cores and an updated Law Dome record over the period 1975–2016. Annual sea salt concentrations from the Mount Brown South site record preserve a stronger signal for the El Niño–Southern Oscillation (ENSO; austral winter and spring, r = 0.533, p < 0.001, Multivariate El Niño Index) compared to a previously defined Law Dome record of summer sea salt concentrations (November–February, r = 0.398, p = 0.010, Southern Oscillation Index). The Mount Brown South site record and Law Dome record preserve inverse signals for the ENSO, possibly due to longitudinal variability in meridional transport in the southern Indian Ocean, although further analysis is needed to confirm this. We suggest that ENSO-related sea surface temperature anomalies in the equatorial Pacific drive atmospheric teleconnections in the southern mid-latitudes. These anomalies are associated with a weakening (strengthening) of regional westerly winds to the north of Mount Brown South that correspond to years of low (high) sea salt deposition at Mount Brown South during La Niña (El Niño) events. The extended Mount Brown South annual sea salt record (when complete) may offer a new proxy record for reconstructions of the ENSO over the recent millennium, along with improved understanding of regional atmospheric variability in the southern Indian Ocean, in addition to that derived from Law Dome.
APA, Harvard, Vancouver, ISO, and other styles
46

Devincenzi, Susana Mariel. "Catálogo de ejemplares tipo de las Colecciones Paleontológicas del Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales (IANIGLA), Mendoza, Argentina." Revista del Museo de La Plata 1, no. 2 (2016): 83–108. http://dx.doi.org/10.24215/25456377e007.

Full text
Abstract:
El Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales (IANIGLA) custodia cinco colecciones paleontológicas que empezaron a formarse en la década de 1990 y cuya información sobre los ejemplares tipo estuvo siempre atomizada. En esta contribución, se presenta por primera vez el catálogo del material tipo de cada una de las colecciones de Paleontología del IANIGLA, que corresponde a fósiles de invertebrados, vertebrados, plantas, icnitas y palinomorfos. Este material procede de secuencias sedimentarias paleozoicas y mesozoicas del noroeste y centro-oeste de Argentina y corresponde a 5 géneros y 31 especies publicadas hasta mediados del año 2015. Para cada taxón, se proporciona información sobre la sistemática, la sinonimia, la diagnosis, su identificación, el estatus, la localidad tipo, la procedencia estratigráfica y la derivación del nombre del taxón. Se indica la cantidad de holotipos y de paratipos que pertenecen a cada una de las colecciones y se señala el material no localizado.
APA, Harvard, Vancouver, ISO, and other styles
47

Yao, Tandong, Fuyuan Wu, Lin Ding, et al. "Multispherical interactions and their effects on the Tibetan Plateau's earth system: a review of the recent researches." National Science Review 2, no. 4 (2015): 468–88. http://dx.doi.org/10.1093/nsr/nwv070.

Full text
Abstract:
Abstract The Tibetan Plateau (TP) is a regional Earth system showing very strong interactions among its lithosphere, hydrosphere, cryosphere, biosphere, atmosphere, and anthrosphere. These interactions manifest TP's impact on surrounding regions and reflect TP's response to the global change. Quantifying the multispherical interactions is critically important to understand the TP environment. Our recent years researches including the ongoing program entitled ‘Tibetan Multi-Spheres Interactions and Their Resource-Environment Significance (TIMI)’, the completed program entitled. ‘Paleo-Altitudes of Tibetan Plateau and Environment (PATE)’, as well as the other relating projects have focused on multidisciplinary research approaches and emphasized on three major pathways: Eurasia-Indian plates collision on deep-Earth dynamics, uplift impact on Earth's mantle–crust dynamics, and contemporary interface on land surface and atmospheric dynamics. Our researches have taken in situ measurement as priority and developed several platforms of data acquisition and analysis, including the platforms of water-phase transformations, and ecosystem observations. Our field investigations have been conducted to obtain data about stratum, paleontology, paleoenvironment, genetic differentiation of animals and plants. We have developed conceptual and mathematical models for crust uplift formation, paleoclimate, glacial melt, water–air interface flux, vegetation climate, and soil erosion. We have also assessed the anthropogenic impacts on environment. Our researches have achieved new and reliable redating of the mantle–crust interaction and initial formation of the TP, found the interaction between tectonics and uplift of the TP and resultant paleoaltitude acting as a spreading source; discovered the interaction between the westerlies and Indian monsoon acting as a control chain that dominates the TP's contemporary environment. The scientific results can play fundamental roles in supporting the TP's resource exploration and societal sustainable development.
APA, Harvard, Vancouver, ISO, and other styles
48

Burdanowitz, Nicole, Tim Rixen, Birgit Gaye, and Kay-Christian Emeis. "Signals of Holocene climate transition amplified by anthropogenic land-use changes in the westerly–Indian monsoon realm." Climate of the Past 17, no. 4 (2021): 1735–49. http://dx.doi.org/10.5194/cp-17-1735-2021.

Full text
Abstract:
Abstract. The Indian summer monsoon (ISM) rainfall is the lifeline for people living on the Indian subcontinent today and was possibly the driver of the rise and fall of early agricultural societies in the past. The intensity and position of the ISM have shifted in response to orbitally forced thermal land–ocean contrasts. At the northwestern monsoon margins, interactions between the subtropical westerly jet (STWJ) and the ISM constitute a tipping element in the Earth's climate system because their non-linear interaction may be a first-order influence on rainfall. We reconstructed marine sea surface temperature (SST), supply of terrestrial material and vegetation changes from a very well-dated sediment core from the northern Arabian Sea to reconstruct the STWJ–ISM interaction. The Holocene record (from 11 000 years) shows a distinct, but gradual, southward displacement of the ISM in the Early to Mid-Holocene, increasingly punctuated by phases of intensified STWJ events that are coeval with interruptions of North Atlantic overturning circulation (Bond events). The effects of the non-linear interactions culminate between 4.6 and 3 ka BP, marking a climatic transition period during which the ISM shifted southwards and the influence of STWJ became prominent. The lithogenic matter input shows an up to 4-fold increase after this time period, probably related to the strengthened influence of agricultural activities of the Indus civilization, with enhanced erosion of soils. This anthropogenic land-use change is amplifying the impact of Bond events and adding to the marine sedimentation rates adjacent to the continent.
APA, Harvard, Vancouver, ISO, and other styles
49

Yeung, Nicholas King-Hei, Laurie Menviel, Katrin J. Meissner, Andréa S. Taschetto, Tilo Ziehn, and Matthew Chamberlain. "Land–sea temperature contrasts at the Last Interglacial and their impact on the hydrological cycle." Climate of the Past 17, no. 2 (2021): 869–85. http://dx.doi.org/10.5194/cp-17-869-2021.

Full text
Abstract:
Abstract. Due to different orbital configurations, high northern latitude summer insolation was higher during the Last Interglacial period (LIG; 129–116 thousand years before present, ka) than during the pre-industrial period (PI), while high southern latitude summer insolation was lower. The climatic response to these changes is studied here with focus on the Southern Hemisphere monsoons, by performing an equilibrium experiment of the LIG at 127 ka with the Australian Earth System Model, ACCESS-ESM1.5, as part of the Paleoclimate Model Intercomparison Project 4 (PMIP4). Simulated mean surface air temperature between 40 and 60∘ N over land during boreal summer is 6.5 ∘C higher at the LIG compared to PI, which leads to a northward shift of the Intertropical Convergence Zone (ITCZ) and a strengthening of the North African and Indian monsoons. Despite 0.4 ∘C cooler conditions in austral summer in the Southern Hemisphere (0–90∘ S), annual mean air temperatures are 1.2 ∘C higher at southern mid-latitudes to high latitudes (40–80∘ S). These differences in temperature are coincident with a large-scale reorganisation of the atmospheric circulation. The ITCZ shifts southward in the Atlantic and Indian sectors during the LIG austral summer compared to PI, leading to increased precipitation over the southern tropical oceans. However, weaker Southern Hemisphere insolation during LIG austral summer induces a significant cooling over land, which in turn weakens the land–sea temperature contrast, leading to an overall reduction (−20 %) in monsoonal precipitation over the Southern Hemisphere's continental regions compared to PI. The intensity and areal extent of the Australian, South American and South African monsoons are consistently reduced in LIG. This is associated with greater pressure and subsidence over land due to a strengthening of the Southern Hemisphere Hadley cell during austral summer.
APA, Harvard, Vancouver, ISO, and other styles
50

Singh, Raj K., Anil K. Gupta, Moumita Das, and Benjamin P. Flower. "Paleoceanographic turnovers during the Plio-Pleistocene in the southeastern Indian Ocean: Linkages with Northern Hemisphere glaciation and Indian Monsoon variability." Palaeogeography, Palaeoclimatology, Palaeoecology 571 (June 2021): 110374. http://dx.doi.org/10.1016/j.palaeo.2021.110374.

Full text
APA, Harvard, Vancouver, ISO, and other styles
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography