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Letteratura scientifica selezionata sul tema "Coniferâs, Fossil"

Autore: Grafiati

Pubblicato: 25 luglio 2024

Ultima modifica: 31 luglio 2025

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Articoli di riviste sul tema "Coniferâs, Fossil"

Ram-Awatar and A. Rajanikanth. "Triassic Conifer wood from the Tiki Formation, South Rewa Basin, Madhya Pradesh, India." Journal of Palaeosciences 56 (December 31, 2007): 127–32. http://dx.doi.org/10.54991/jop.2007.63.

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The present paper records a conifer wood from the Triassic sequence of the Tiki Formation, ~3 km NE of Tiki Village, district Shahdol, Madhya Pradesh, India. Since Triassic wood records are hardly known from India when compared to leaf fossils, the present report of podocarpean wood provides additional evidence for the existence of conifers in the otherwise pteridosperm dominated fossil flora of South Rewa Basin during the Carnian-Norian times.

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Jordan, Gregory J., Raymond J. Carpenter, Jennifer M. Bannister, Daphne E. Lee, Dallas C. Mildenhall, and Robert S. Hill. "High conifer diversity in Oligo-Miocene New Zealand." Australian Systematic Botany 24, no. 2 (2011): 121. http://dx.doi.org/10.1071/sb11004.

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Eight species of Podocarpaceae foliage are recognised from the late Oligocene or early Miocene Newvale site, South Island, New Zealand, and the following five new species are described: two of Dacrydium Lamb. and one each of Dacrycarpus (Endl.) de Laub., Phyllocladus Rich. ex Mirb. and Halocarpus Quinn. The latter is the first macrofossil record of this New Zealand endemic genus. All these conifers, plus Agathis Salisb., Microcachrys Hook.f. and Podocarpus Pers., co-occurred in the local vegetation at Newvale. In conjunction with prior records of macrofossils and pollen, these fossils indicate

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Yao, Zhao-Qi, Lu-Jun Liu, Gar W. Rothwell, and Gene Mapes. "Szecladia new genus, a late Permian conifer with multiveined leaves from South China." Journal of Paleontology 74, no. 3 (2000): 524–31. http://dx.doi.org/10.1017/s0022336000031784.

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A conifer from the uppermost Permian with small, helically arranged leaves is described from the Guangxi Autonomous Region and Guizhou Province of South China as Szecladia multinervia, new genus and species. The material includes both impression specimens and the first anatomically preserved Paleozoic conifer fossils from China. Shoots are irregularly branched, with small, helically arranged, multiveined leaves. Stems display an endarch eustele with abundant, dense wood. Leaf traces diverge from the stele as a single bundle that divides several times in the cortex and at the base of the leaves

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Bomfleur, Benjamin, Christian Pott, and Hans Kerp. "Plant assemblages from the Shafer Peak Formation (Lower Jurassic), north Victoria Land, Transantarctic Mountains." Antarctic Science 23, no. 2 (2010): 188–208. http://dx.doi.org/10.1017/s0954102010000866.

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AbstractThe Jurassic plant fossil record of Gondwana is generally meagre, which renders phytogeographic and palaeoclimatic interpretations difficult to date. Moreover, plant fossil assemblages mainly consist of impressions/compressions with rather limited palaeobiological and palaeoecological significance. We here present a detailed survey of new Early Jurassic plant assemblages from the Pliensbachian Shafer Peak Formation, north Victoria Land, Transantarctic Mountains. Some of the well-preserved fossils yield cuticle. The floras consist of isoetalean lycophytes, sphenophytes, several ferns, b

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Hansen, Barbara C. S. "Conifer stomate analysis as a paleoecological tool: an example from the Hudson Bay Lowlands." Canadian Journal of Botany 73, no. 2 (1995): 244–52. http://dx.doi.org/10.1139/b95-027.

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The identification of conifer stomata in fossil pollen preparations of peat cores from the Hudson Bay Lowlands is used to determine the local presence of conifers in lieu of macrofossil analyses. The differentiation of eight conifer stomate types (Picea type, Larix laricina, Pinus sp., Abies sp., Tsuga mertensiana, Tsuga heterophylla, Chamaecyparis nootkatensis, and Thuja type) is accomplished with a key, diagrammatic stomate illustrations, photographs, and measurements. Results of fossil conifer-stomate analyses indicate that both Picea and Larix arrived locally in the Albany River area of th

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Kunzmann, L., B. A. R. Mohr, and M. E. C. Bernardes-de-Oliveira. "Gymnosperms from the Lower Cretaceous Crato Formation (Brazil). I. Araucariaceae and Lindleycladus (incertae sedis)." Fossil Record 7, no. 1 (2004): 155–74. http://dx.doi.org/10.5194/fr-7-155-2004.

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Fossil conifers from the Early Cretaceous, most likely late Aptian, Crato Formation were studied. The excellent preservation of several of those fossils allowed detailed investigations of the leaf epidermis by light microscope (LM) and by scanning electron microscope (SEM). Members of two conifer taxa were recognized: The Araucariaceae are represented by a female cone of cf. Araucaria spec. A juvenile cone (Araucariostrobus spec.) and sterile foliage shoots of Brachyphyllum obesum might be attributed to the Araucariaceae as well. The mor

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Atkinson, Brian A., Dori L. Contreras, Ruth A. Stockey, and Gar W. Rothwell. "Ancient diversity and turnover of cunninghamioid conifers (Cupressaceae): two new genera from the Upper Cretaceous of Hokkaido, Japan." Botany 99, no. 8 (2021): 457–73. http://dx.doi.org/10.1139/cjb-2021-0005.

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Conifers of the taxodiaceous grade of Cupressaceae were more diverse and widespread during the Mesozoic than they are today. The earliest diverging subfamily, Cunninghamioideae, only includes a single extant genus, but has at least 10 fossil genera. Here, two additional cunninghamioid genera are characterized on the basis of permineralized seed cones from the Upper Cretaceous of Hokkaido, Japan. These conifers display seed cone characters typical of cunninghamioids; however, they have a mosaic of characters that are not seen in any reported conifer of Cupressaceae. They are, therefore, designa

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Kvaček, Jiří, and Jakub Sakala. "Late Cretaceous flora of James Ross Island (Antarctica) – preliminary report." Czech Polar Reports 1, no. 2 (2011): 96–103. http://dx.doi.org/10.5817/cpr2011-2-9.

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Fossil plants from Late Cretaceous strata (Hidden Lake Formation and Santa Marta Formation) of James Ross Basin exposed in the northern part of the James Ross Island are preliminary described. Both formations contain plant mega fossils, petrified wood, and charcoalified mesofossils. Fossil plants from the Hidden Lake Formation are represented by leaf impressions of pteridophytes (Microphyllopteris, Delosorus, Lygodium), conifers (Elatocladus, Brachyphyllum, Pagiophyllum, Araucaria, Podozamites vel Lindleycladus), Bennettitales vel Cycadales (Zamites vel Dioonites sp.) and angiosperms (Cinnamom

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Condamine, Fabien L., Daniele Silvestro, Eva B. Koppelhus, and Alexandre Antonelli. "The rise of angiosperms pushed conifers to decline during global cooling." Proceedings of the National Academy of Sciences 117, no. 46 (2020): 28867–75. http://dx.doi.org/10.1073/pnas.2005571117.

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Competition among species and entire clades can impact species diversification and extinction, which can shape macroevolutionary patterns. The fossil record shows successive biotic turnovers such that a dominant group is replaced by another. One striking example involves the decline of gymnosperms and the rapid diversification and ecological dominance of angiosperms in the Cretaceous. It is generally believed that angiosperms outcompeted gymnosperms, but the macroevolutionary processes and alternative drivers explaining this pattern remain elusive. Using extant time trees and vetted fossil occ

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Taylor, David W., J. Michael Moldowan, and Leo J. Hickey. "Investigation of the terrestrial occurrence and biological source of the petroleum geochemical biomarker oleanane." Paleontological Society Special Publications 6 (1992): 286. http://dx.doi.org/10.1017/s2475262200008467.

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Oleanane is a triterpane that is commonly found in Late Cretaceous (Campanian) through Cenozoic marine and deltaic rocks and related oils. Based on its affinity to the β-Amyrin group of natural products and its abundance in Tertiary deltaic sediments and oils, such as in the Niger Delta, oleanane is thought to be a geochemical fossil of terrestrial flowering plants. The β-Amyrin group forms the basis of many angiosperm triterpenoids and triterpenoid saponins. These compounds appear in moderately advanced flowering plant lineages and are often used as a defense against herbivores. This group of

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Più fonti

Tesi sul tema "Coniferâs, Fossil"

Ewin, Timothy Alfred. "Identification of conifer families using SEM analysis of fossil and extant conifer leaf cuticles." Thesis, University of Manchester, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.493777.

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The cuticles of 58 extant conifer species are examined using scanning electron microscopy (SEM) and described in detail for the first time. The chosen species include representatives of all extant conifer families and also coincide with the species used in various recent genetic conifer phylogenies. A detailed phylogeny of the Coniferales has been compiled by the amalgamation of published genetic phylogenies. Sixty nine cuticle characteristics are identified and scored a numerical system, similar to numerical analyses by Alvin et al (1982). The character scores are plotted onto the Conifer phy

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Barral, Cuesta Abel. "The carbon isotope composition of the fossil conifer Frenelopsis as a proxy for reconstructing Cretaceous atmospheric CO2." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1148.

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Le Crétacé a été une période d'instabilité climatique et du cycle du carbone, dont le CO2 atmosphérique a été désigné comme le driver majeur. Cependant, les reconstitutions du CO2 atmosphérique ne reflètent ni les dynamiques climatiques ni les grands évènements de perturbation du cycle du carbone décrits pour cette période. J'ai utilisé la composition isotopique de carbone de la plante fossile Frenelopsis (d13Cleaf) comme un nouvel proxy pour reconstituer le CO2 atmosphérique du Crétacé en termes de composition isotopique de carbone (d13CCO2) et de concentration (pCO2). La première courbe de d

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Lu, Yueming. "Détermination de la signature moléculaire des conifères fossiles par la maturation artificielle de leurs homologues actuels : implications paléobotaniques et paléoenvironnementales." Thesis, Université de Lorraine, 2014. http://www.theses.fr/2014LORR0353/document.

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De nombreuses biomolécules qui constituent les plantes vasculaires ne sont synthétisées que par certains taxons de plantes et ont donc une spécificité chimiotaxonomique. Certaines d'entre elles, tels que les bioterpénoïdes, sont particulièrement résistantes et sont préservées dans les sédiments où elles se transforment en géoterpénoïdes lors de la diagenèse. Ces géoterpénoïdes conservent, partiellement ou totalement, leur spécificité initiale (spécifité paléochimiotaxonomique). Cependant, nos connaissances actuelles en paléochimiotaxonomie botanique, qui permettent d'associer ces biomarqueurs

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Fradet, Alice. "Caractérisation moléculaire d’ambres géologiques et archéologiques : origines botaniques et géographiques." Electronic Thesis or Diss., Strasbourg, 2025. http://www.theses.fr/2025STRAF009.

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Les travaux de cette thèse comprennent deux volets dédiés à l'étude moléculaire d’ambres issus de formations géologiques et trouvés en contexte archéologique. Le premier volet, d’ordre paléobotanique, vise à établir une corrélation entre les signatures moléculaires d’ambres et leurs sources botaniques. Un référentiel moléculaire d’ambre de différents sites européens et méditerranéens a ainsi été établi. Cette étude a notamment permis de proposer une typologie moléculaire pour les ambres de Cheirolepidiacées, une famille éteinte de conifères, et de mettre en évidence une nouvelle famille de com

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Brown, MJM. "Old plants, new tricks : machine learning and the conifer fossil record." Thesis, 2022. https://eprints.utas.edu.au/47489/1/Brown_whole_thesis.pdf.

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The palaeobotanical record contains a wealth of information on the evolution and ecology of species, as well as the palaeoenvironment. However, accessing and analysing this information can be challenging. It is not possible to study the ecology of fossils directly, but there are two main inferential approaches to palaeoecology: nearest living relative (NLR) techniques, and physiognomic methods. In NLR techniques, the taxonomic identity of the fossil is key – once the nearest living relatives of a fossil have been identified, we can study the ecology of living species in order to make inferenc

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Libri sul tema "Coniferâs, Fossil"

Dijkstra, S. J. Gymnospermae (Gingophyta et Coniferae). Backhuys Publishers, 1999.

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J, Enright Neal, and Hill Robert S, eds. Ecology of the southern conifers. Smithsonian Institution Press, 1995.

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Srinivasan, Vijayalakshmi. Taxodiaceous conifers from the Upper Cretaceous of Sweden. Royal Danish Academy of Sciences and Letters, 1989.

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Kunzmann, Lutz. Koniferen der Oberkreide und ihre Relikte im Tertiär Europas: Ein Beitrag zur kenntnis ausgestorbener Taxodiaceae und Geinitziaceae fam. nov. Staatliches Museums für Mineralogie und Geologie zu Dresden, 1999.

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The Wollemi pine: The incredible discovery of a living fossil from the age of the dinosaurs. Text Publishing, 2005.

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The Wollemi pine. Text Publishing, 2002.

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Capitoli di libri sul tema "Coniferâs, Fossil"

Górriz-Mifsud, Elena, Aitor Ameztegui, Jose Ramón González, and Antoni Trasobares. "Climate-Smart Forestry Case Study: Spain." In Forest Bioeconomy and Climate Change. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-99206-4_13.

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AbstractIn Spain, 55% of land area is covered by forests and other woodlands. Broadleaves occupy a predominant position (56%), followed by conifers (37%) and mixed stands (7%). Forest are distributed among the Atlantic (north-western Iberian rim), Mediterranean (rest of the peninsula including the Balearic Islands) and Macaronesian (Canary Islands) climate zones. Spanish woodlands provide a multiplicity of provisioning ecosystem services, such as, wood, cork, pine nuts, mushrooms and truffles. In terms of habitat services, biodiversity is highly relevant. Cultural services are mainly recreatio

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TAYLOR, T. "Conifers." In Biology and Evolution of Fossil Plants. Elsevier, 2009. http://dx.doi.org/10.1016/b978-0-12-373972-8.00021-8.

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Love*, Renee L., Lindsay MacKenzie*, and Ian Spendlove*. "Uncovering a Miocene forest in ancient Lake Clarkia and beyond." In Proterozoic Nuna to Pleistocene Megafloods: Sharing Geology of the Inland Northwest. Geological Society of America, 2024. http://dx.doi.org/10.1130/2024.0069(06).

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ABSTRACT The middle Miocene Clarkia Fossil Beds of northern Idaho, USA, is a world-renowned exceptional fossil deposit (Fossil-Lagerstätte). These ancient lake deposits contain fossils showing exceptional preservation of original plant material, insects, and fish, including organelles and possible ancient DNA, and their stable isotope signatures. Yang et al. (1995) determined the upper age of the lake deposits to be 15.78 ± 0.039 Ma during peak outflows of the Priest Rapids Member of the Wanapum Basalt of the Columbia River Basalt Group, part of Earth’s youngest large igneous province of conti

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Savill, Peter, Julian Evans, Daniel Auclair, and Jan Falck. "Short-rotation crops." In Plantation Silviculture in Europe. Oxford University PressOxford, 1997. http://dx.doi.org/10.1093/oso/9780198549093.003.0015.

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Abstract In temperate regions, short-rotation crops may be considered as those grown on rotations of less than about 30 years. Many traditional, broadleaved coppice crops fulfil this definition but it also includes some short-rotation plantations grown for specialized products, notably Populus spp. and Eucalyptus spp. and some conifers grown directly for pulp with no intermediate thinnings. With the present European trend towards diversified land uses, and in particular the ‘set-aside’ policy, increasing areas of former agricultural land will become available for non-food crops. Rather than ha

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Morey, Elsie Darrah. "Carl Rudolf Florin (1894–1965): A pioneer in fossil-conifer studies." In Historical Perspective of Early Twentieth Century Carboniferous Paleobotany in North America. Geological Society of America, 1995. http://dx.doi.org/10.1130/mem185-p119.

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Paracer, Surindar, and Vernon Ahmadjian. "Fungal Associations Of Protozoa And Animals." In Symbiosis. Oxford University PressNew York, NY, 2000. http://dx.doi.org/10.1093/oso/9780195118063.003.0007.

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Abstract Morn than 1 million species of fungi are estimated to exist, but only about 69,000 species have been described. Most of the undescribed fungi occur in tropical and subtropical regions of the world (Hawksworth and Rossman, 1997). Some fungi are large, like mushrooms, but most of them are microscopic. Armillaria bulbosa, a fungal parasite of the roots of conifers and hardwoods, may be one of the largest and oldest living organisms. One individual strain of this fungus occupies more than 30 acres of Michigan forest, weighs more than 11.0 tons, and is estimated to be 1500 years old (M.L.

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Ornduff, Robert. "The Sequoia Sempervirens (Coast Redwood) Forest of the Pacific Coast, USA." In Coastally Restricted Forests. Oxford University PressNew York, NY, 1997. http://dx.doi.org/10.1093/oso/9780195075670.003.0015.

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Abstract Since its discovery in the late 18th century, scientists and lay persons alike have been impressed by the magnificence of the stately Sequoia sempervirens (coast redwood) and the dense forests it forms. Yet this conifer is one of the world’s most restricted tree species, occurring only along a very narrow portion of the Pacific coast of California and Oregon. Within this narrow range, however, S. sempervirens exerts a powerful ecological influence in its ecosystem. This chapter describes the morphological features of S. sempervirens, its geographical distribution and the factors that

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Dolezych, M., L. Reinhardt, J. Kus, and V. Annacker. "Taxonomy of Cretaceous–Paleogene coniferous woods and their distribution in fossil Lagerstätten of the high latitudes." In Circum-Arctic Structural Events: Tectonic Evolution of the Arctic Margins and Trans-Arctic Links with Adjacent Orogens. Geological Society of America, 2019. http://dx.doi.org/10.1130/2018.2541(02).

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Atti di convegni sul tema "Coniferâs, Fossil"

Brown, Alexander L., and Richard A. Jepsen. "Forest Thinning Residues as a Potential Fuel Source." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11679.

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Northern New Mexico forests are characterized predominantly by small (i.e. around 10 cm diameter), densely populated conifers. Land managers, both private and government, often thin the forests to reduce the risks from wildland fire. Thinned residues typically amount to approximately 20 to 50 tons per acre. With no obvious market use for these small thinning residues, they are presently either discarded on the ground, or burnt as waste. Through a small business assistance initiative, Sandia National Laboratories is helping to identify and promote process improvements. Several productive uses o

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Leng, Qin, Jiaqi Liang, Daianne Höfig, et al. "Assessment of natural variations of key fossil parameters in conifer species and their impact on the accuracy of the leaf gas exchange model for ancient CO₂ reconstruction." In Goldschmidt2021. European Association of Geochemistry, 2021. http://dx.doi.org/10.7185/gold2021.6576.

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