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Journal articles on the topic 'Early Jurassic'

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Published: 2 June 2025

Last updated: 31 July 2025

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1

Crux, Jason A. "Early Jurassic calcareous nannofossil biostratigraphic events." Newsletters on Stratigraphy 17, no. 2 (1987): 79–100. http://dx.doi.org/10.1127/nos/17/1987/79.

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2

Brandt, Klaus. "Glacioeustatic cycles in the Early Jurassic?" Neues Jahrbuch für Geologie und Paläontologie - Monatshefte 1986, no. 5 (1986): 257–74. http://dx.doi.org/10.1127/njgpm/1986/1986/257.

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3

Hudson, Wendy, Malcolm B. Hart, and Christopher W. Smart. "Palaeobiogeography of early planktonic foraminifera." Bulletin de la Société Géologique de France 180, no. 1 (2009): 27–38. http://dx.doi.org/10.2113/gssgfbull.180.1.27.

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Abstract Over the last 50 years, our knowledge of early planktonic foraminifera has changed markedly. In 1958 Grigelis described “Globigerina oxfordiana” from the Upper Jurassic of Lithuania and this has, subsequently, become identified as one of the most geographically widespread of Jurassic planktonic taxa. There is a danger in that many authors identify any planktonic foraminiferid from the Jurassic as this taxon, rather than consider the alternative species described in the literature. In the period from 1967 to 1973, however, Dr W. Fuchs (Austria) identified a number of new taxa from the

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Xu, Zhongjie, Jintao Kong, Rihui Cheng, and Liaoliang Wang. "U–Pb dating of detrital zircons in the eastern Guangdong Basin, South China, and constraints on the tectonic transformation from the Early to Middle Jurassic." Canadian Journal of Earth Sciences 57, no. 4 (2020): 477–93. http://dx.doi.org/10.1139/cjes-2019-0050.

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Controversies exist regarding the mechanism of formation of basins located on the continental margin of South China as well as when they formed. It was ascertained based on clastic petrology, geochemical analysis, and zircon U–Pb dating that the sedimentary provenances in the eastern Guangdong Basin are mainly felsic igneous rocks from the late Early Jurassic to the Middle Jurassic. The late Early Jurassic Qiaoyuan Formation mainly shows major age peaks at approximately 238 Ma, 259 Ma, and 1858 Ma, and the Middle Jurassic Tangxia Formation shows major age peaks at approximately 169 Ma and 172

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Shi, Lu, Nan Ju, Yuhui Feng, Changqing Zheng, Yue Wu, and Xin Liu. "Petrogenesis and Tectonic Setting of the Early and Middle Jurassic Granitoids in the Chaihe Area, Central Great Xing’an Range, NE China." Minerals 13, no. 7 (2023): 917. http://dx.doi.org/10.3390/min13070917.

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To ascertain the Early-to-Middle Jurassic tectonic setting in the central Great Xing’an Range, this study investigated the Early and Middle Jurassic granitoids exposed in the Chaihe area in the central Great Xing’an Range based on isotopic chronology and petrogeochemistry. The results of this study show that the Early and Middle Jurassic granitoids have emplacement ages of 179–172 Ma. Moreover, the Early and Middle Jurassic granitoids are high-K calc-alkaline unfractionated I-type granitoids and high-K calc-alkaline fractionated I-type granitoids, respectively. The magma sources of the Early a

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6

Egebjerg Mogensen, Tommy, and John A. Korstgård. "Triassic and Jurassic transtension along part of the Sorgenfrei–Tornquist Zone in the Danish Kattegat." Geological Survey of Denmark and Greenland (GEUS) Bulletin 1 (October 28, 2003): 437–58. http://dx.doi.org/10.34194/geusb.v1.4680.

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In the Kattegat area, Denmark, the Sorgenfrei–Tornquist Zone, an old crustal weakness zone, was repeatedly reactivated during Triassic, Jurassic and Early Cretaceous times with dextral transtensional movements along the major boundary faults. These tectonic events were minor compared to the tectonic events of the Late Carboniferous – Early Permian and the Late Cretaceous – Early Tertiary, although a dynamic structural and stratigraphic analysis indicates that the Sorgenfrei–Tornquist Zone was active compared to the surrounding areas. At the end of the Palaeozoic, the area was a peneplain. Regi

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Shubin, Neil H., and Farish A. Jenkins. "An Early Jurassic jumping frog." Nature 377, no. 6544 (1995): 49–52. http://dx.doi.org/10.1038/377049a0.

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GRÜNDEL, JOACHIM, ANDRZEJ KAIM, ALEXANDER NÜTZEL, and CRISPIN T. S. LITTLE. "Early Jurassic gastropods from England." Palaeontology 54, no. 3 (2011): 481–510. http://dx.doi.org/10.1111/j.1475-4983.2011.01043.x.

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Yao, Qiuhui, and Kai Cui. "Early and middle Jurassic sequence stratigraphic division of M coalfield in Xinjiang." E3S Web of Conferences 352 (2022): 01073. http://dx.doi.org/10.1051/e3sconf/202235201073.

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The coal accumulation in the M coalfield occurred in the Early-Middle Jurassic. There are three main coal-bearing strata in the M coalfield, the Early Jurassic Talicike Formation, the Yangxia Formation and the Middle Jurassic Kizilenur Formation. Based on the sequence stratigraphic division and sedimentary environment analysis of 85 Jurassic wells in the Kubai Basin, and the compilation of sequence stratigraphic correlation profiles for 20 well-connected wells, this paper comprehensively studies the drilling, logging, outcrop, core and paleontological data. This paper establishes the isochrono

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10

Nützel, Alexander, and Joachim Gründel. "Early Jurassic (Pliensbachian) gastropods from Franconia, Southern Germany." Palaeontographica Abteilung A 305, no. 1-3 (2015): 1–89. http://dx.doi.org/10.1127/pala/305/2015/1.

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11

DRUCKENMILLER, PATRICK S., and ERIN E. MAXWELL. "A Middle Jurassic (Bajocian) ophthalmosaurid (Reptilia, Ichthyosauria) from the Tuxedni Formation, Alaska and the early diversification of the clade." Geological Magazine 151, no. 1 (2013): 41–48. http://dx.doi.org/10.1017/s0016756813000125.

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AbstractOphthalmosauridae is a clade of derived thunniform ichthyosaurs that are best known from Callovian (late Middle Jurassic) to Cenomanian-aged (Late Cretaceous) deposits in both the Northern and Southern Hemispheres. Ophthalmosaurids arose prior to the Early–Middle Jurassic boundary, however, very little is known about their diversity and distribution in the earliest phase of their evolutionary history during the Aalenian–Bathonian (Middle Jurassic) interval. Here we describe new diagnostic ophthalmosaurid material from the Early Bajocian (Middle Jurassic) of Alaska. The specimen, UAMES

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Sapunov, Ivo, Platon Tchoumatchenco, and Vladimir Shopov. "The Lower Jurassic in a part of western Stara Planina Mts. (biostratigraphy and palaeotectonics)." Geologica Balcanica 24, no. 2 (1994): 3–19. http://dx.doi.org/10.52321/geolbalc.24.2.3.

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Detailed biostratigraphical study (on brachiopods, bivalves and ammonites) on seven instructive sections established that only a part of them are complete, while the others are more or less incomplete. The reason for this phenomenon is the gradual marine Early Jurassic transgression which has occurred during the Hettangian in some areas (i.e. the section near the Gaganica Village), and later – during the Early Pliensbachian (the section at the Ledenika Cave). Locally the marine transgression had been preceded by continental lacustrine and (or) paludal accumulation (the sections near the villag

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13

Wang, Ping Li, Da Wei Lv, Hai Yan Liu, Xue Zheng, and Yu Lin Lv. "Migration Law of Mesozoic Qaidam Basin Depocenters." Advanced Materials Research 524-527 (May 2012): 63–66. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.63.

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According to stratigraphy and distribution features of the Qaidam Basin, and further the formation and migration of it’s depocenters, it is considered that the Middle-Upper Triassic were mainly sags scattered among the Qilian Mountains, the Alabasitao Mountains and the Kunlun Mountains; the Early Jurassic depocenters were located mainly in Lenghu depression and Yiliping sag at the northwest of the basin; several Middle Jurassic depocenters distributed from the northwest to the southeast of the basin along Sertengshan-Yuqia near front of the Qilian mountains; the Late Jurassic-Cretaceous depoce

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Ghalandari, Zohreh, Mohammad Vahidinia, and Seyyed Reza Mousavi-Harami. "Jurassic Biostratigraphy in the Persian Gulf, South of Iran." Micropaleontology 65, no. 5 (2019): 449–58. http://dx.doi.org/10.47894/mpal.65.5.05.

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The Neyriz, Surmeh and Hith Formations outcrop in the Persian Gulf area. Assemblages of benthic foraminifera and green algae were studied in 789 meters from these formations in the onshore middle part of the Persian Gulf, South of Iran. These formations consist of grey shales, dolomite, limestone and anhydrite. The Neyriz andHith formations are barren of fossils and the age of Neyriz Formation is Early Jurassic and the age of Hith Formation is Late Jurassic (Tithonian) based on stratigraphy. In the Surmeh Formation 18 genera and 17 species of benthic foraminifera, 5 genera and 3 species of alg

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Schwarzhans, Werner, and Helmut Keupp. "Early teleost otolith morphogenesis observed in the Jurassic of Franconia, Bavaria, southern Germany." Zitteliana 96 (April 12, 2022): 51–67. https://doi.org/10.3897/zitteliana.96.81737.

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The otoliths described in this study are from the late Pliensbachian of the Buttenheim clay pit near Bamberg, Franconia, northern Bavaria, and represent one of the earliest teleost otolith assemblages known so far. A total of 351 otoliths have been recovered, many of which are well-preserved and of sizes that indicate they originated from adult specimens and can be considered morphologically mature. The assemblage contains seven species, four of them stem teleosts of the genus Leptolepis and three from the enigmatic otolith-based genus Archaeotolithus, which cannot be attributed to a firm syst

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16

Shubin, Neil H., and Hans-Dieter Sues. "Biogeography of early Mesozoic continental tetrapods: patterns and implications." Paleobiology 17, no. 3 (1991): 214–30. http://dx.doi.org/10.1017/s0094837300010575.

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The stratigraphic framework for Triassic and Early Jurassic continental strata has greatly changed in recent years. These revised correlations necessitate a review of traditional views of early Mesozoic continental faunal succession and biogeography. We have examined the relationship between tetrapod distribution and paleogeographic context during the Triassic and Early Jurassic on the basis of a data base comprising updated faunal lists for major early Mesozoic assemblages of continental tetrapods. Analysis of these data supports the hypothesis that there were few barriers to biotic interchan

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17

Zhimulev, F. I., E. V. Vetrov, I. S. Novikov, et al. "Mesozoic Intracontinental Orogeny in the Tectonic History of the Kolyvan’– Tomsk Folded Zone (Southern Siberia): a Synthesis of Geological Data and results of Apatite Fission Track Analysis." Russian Geology and Geophysics 62, no. 9 (2021): 1006–20. http://dx.doi.org/10.2113/rgg20204172.

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Abstract —The Kolyvan’–Tomsk folded zone (KTFZ) is a late Permian collisional orogen in the northwestern section of the Central Asian Orogenic Belt. The Mesozoic history of the KTFZ area includes Late Triassic–Early Jurassic and Late Jurassic–Early Cretaceous orogenic events. The earlier event produced narrow deep half-ramp basins filled with Early–Middle Jurassic molasse south of the KTFZ, and the later activity rejuvenated the Tomsk thrust fault, whereby the KTFZ Paleozoic rocks were thrust over the Early–Middle Jurassic basin sediments. The Mesozoic orogenic events induced erosion and the e

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18

Tripathi, Archana. "Palynological events during Late Triassic-Early Jurassic time in India." Journal of Palaeosciences 49, no. (1-3) (2000): 399–408. http://dx.doi.org/10.54991/jop.2000.157.

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Recently acquired palynological data from Dubrajpur sediments show the presence of spore-pollen taxa diagnostic of the Late Triassic-Early Jurassic. The change in palynofloral composition is gradual and not abrupt. This palynosequence has been evaluated in terms of dominance/sub-dominance. Overall composition and First Appearance Datums of specific biomarker genera. viz.. Stereisporites, Foveosporites, Dictophyllidites, Nevesisporites. Lundbladispora, Enzonalasporites, Classopollis, Playfordiaspora. Striatopodocarpites, Arcuatipollenites, Infernopollenites, Straurosaccites, Minutosaccus, Podoc

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19

Santos Polo, Alan, Guo Weimin, Fernando Rivera, Colombo Tassinari, Luis Cerpa, and Shoji Kojima. "Early Jurassic arc related magmatism associated with porphyry copper mineralization at Zafranal, Southern Peru unraveled by zircon U-Pb ages." Andean Geology 46, no. 3 (2019): 445. http://dx.doi.org/10.5027/andgeov46n3-3041.

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Early Jurassic arc-related igneous rocks host porphyry copper prospects and gold-bearing quartz vein deposits in southern Peru. Ten new zircon U-Pb ages for wall rocks of gold-bearing quartz veins, Jurassic rocks and copper-mineralized porphyry bodies in Zafranal porphyry copper, together with published ages for Jurassic rocks, reveal a continuous magmatic evolution of the early Jurassic arc. The Jurassic rocks and gold-bearing quartz vein systems in the western flank of the Western Cordillera are hosted by Paleo- and Meso-proterozoic orthogneisses of the Arequipa Massif (1.75-1.44 Ga) that un

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20

Olsen, P., N. Shubin, and M. Anders. "New early Jurassic tetrapod assemblages constrain Triassic-Jurassic tetrapod extinction event." Science 237, no. 4818 (1987): 1025–29. http://dx.doi.org/10.1126/science.3616622.

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21

Sichler, B., and M. Perrin. "New early Jurassic paleopole from France and Jurassic apparent polar wander." Earth and Planetary Science Letters 115, no. 1-4 (1993): 13–27. http://dx.doi.org/10.1016/0012-821x(93)90209-r.

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22

Wang, Hao, and Ling Yun Pang. "Sequence Strata Division and Source Bed of Coal Bed Gas Accumulation Law of Early~Middle Jurassic at Xinjiang KuBai Coalfield." Advanced Materials Research 926-930 (May 2014): 4348–52. http://dx.doi.org/10.4028/www.scientific.net/amr.926-930.4348.

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The coal accumulation effect occurred at KuBai Coalfield in the early~middle Jurassic, including three major coal-bearing strata: Tarja Chick and Yangxia Group of Early Jurassic, and Kezilenuer group of Middle Jurassic. This article makes the contrast segment of 20 tie-well sequence strata by dividing the sequence strata and analyzing the depositional environment analysis of 85 drilling wells at Jurassic strata of KuBai Basin. By overall analyzing the materials of drilling, logging, outcropping, core and paleontology, it establishes the contrast framework of isochronal sequence strata with the

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23

Sajjadi Hezaveh, Freshteh, Firoozeh Hashemi Yazdi, Ali Khazaei, Navid Navidi-Izad, and Mohammad Taghi Badihagh. "Palynology of the Middle Jurassic strata from the Alborz Ranges, northwestern Iran." Boletín de la Sociedad Geológica Mexicana 77, no. 1 (2025): A141124. https://doi.org/10.18268/bsgm2025v77n1a141124.

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Palynomorphs are used for palynostratigraphy, and to derive paleoecological and paleobiogeographical inferences from the Middle Jurassic Shemshak Formation, Alborz Ranges, northwestern Iran. The rock unit contains diverse, reasonably preserved palynofloras dominated by miospores and dinoflagellate cysts. Vertical distribution of miospores allows for the introduction of Klukisporites variegatus -Striatella spp.- Contignisporites burgeri assemblage zone in the host strata. The presence of such key miospore species as Striatella jurassica, S. patenii, S. seebergensis, and Contignisporites burgeri

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Kriwet, Jürgen, Wolfgang Kiessling, and Stefanie Klug. "Diversification trajectories and evolutionary life-history traits in early sharks and batoids." Proceedings of the Royal Society B: Biological Sciences 276, no. 1658 (2008): 945–51. http://dx.doi.org/10.1098/rspb.2008.1441.

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Different interpretations on the timing of early diversification and radiation of modern sharks and batoids (Neoselachii) in the Earth's history exist and are related to discrepancies in taxonomic and phylogenetic interpretations favouring a Late Triassic or earliest Jurassic diversification and subsequent radiation event, respectively. Sampling standardization based on pooled taxonomic occurrences made it possible to overcome the problem of a much richer neoselachian record in the Late Jurassic than earlier on. The standardized pattern of genus richness is one of low and fairly constant diver

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Mannion, Philip D. "A turiasaurian sauropod dinosaur from the Early Cretaceous Wealden Supergroup of the United Kingdom." PeerJ 7 (January 24, 2019): e6348. http://dx.doi.org/10.7717/peerj.6348.

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The Jurassic/Cretaceous (J/K) boundary, 145 million years ago, has long been recognised as an extinction event or faunal turnover for sauropod dinosaurs, with many ‘basal’ lineages disappearing. However, recently, a number of ‘extinct’ groups have been recognised in the Early Cretaceous, including diplodocids in Gondwana, and non-titanosauriform macronarians in Laurasia. Turiasauria, a clade of non-neosauropod eusauropods, was originally thought to have been restricted to the Late Jurassic of western Europe. However, its distribution has recently been extended to the Late Jurassic of Tanzania

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Gow, Chris E., and James W. Kitching. "Early Jurassic crocodilomorphs from the Stormberg of South Africa." Neues Jahrbuch für Geologie und Paläontologie - Monatshefte 1988, no. 9 (1988): 517–36. http://dx.doi.org/10.1127/njgpm/1988/1988/517.

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27

Toumoulin, Agathe, Anne-Laure Decombeix, Carla J. Harper, and Rudolph Serbet. "Early Jurassic silicified woods from Carapace Nunatak, South Victoria Land, Antarctica." Fossil Record 26, no. 1 (2023): 103–15. http://dx.doi.org/10.3897/fr.26.102570.

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The Jurassic vegetation of Antarctica remains poorly known and, while there have been several reports of large fossil trees from that time period across the continent, detailed anatomical studies of their wood are extremely scarce. Here we describe new silicified woods of Early Jurassic (probably Toarcian) age from Carapace Nunatak, South Victoria Land. The genera Agathoxylon and Brachyoxylon are formally recognized for the first time in the Jurassic of Antarctica. The preservation of the woods is imperfect, which is likely explained by the presence in some of the specimens of fungi, whose ana

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Görög, Ágnes, and Agnes Gorog. "Early Jurassic Planktonic Foraminifera from Hungary." Micropaleontology 40, no. 3 (1994): 255. http://dx.doi.org/10.2307/1485819.

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29

Jenkins, Parish A., and Denis M. Walsh. "An Early Jurassic caecilian with limbs." Nature 365, no. 6443 (1993): 246–50. http://dx.doi.org/10.1038/365246a0.

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Jones, Charles E., Hugh C. Jenkyns, and Stephen P. Hesselbo. "Strontium isotopes in Early Jurassic seawater." Geochimica et Cosmochimica Acta 58, no. 4 (1994): 1285–301. http://dx.doi.org/10.1016/0016-7037(94)90382-4.

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31

McGowan, Chris. "Giant ichthyosaurs of the Early Jurassic." Canadian Journal of Earth Sciences 33, no. 7 (1996): 1011–21. http://dx.doi.org/10.1139/e96-077.

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Temnodontosaurus platyodon, from the English lower Liassic (Hettangian and Sinemurian), is a large ichthyosaur that reached an estimated length of almost 9 m (29 ft). Although represented by at least 13 specimens, few are complete, and the species cannot be described as well known. A similarly sized species from the upper Liassic (Toarcian) of Germany has hitherto been referred to a separate genus, but is shown here to be referable to Temnodontosaurus. This species, T. burgundiae, shares several features in common with T. platyodon, including a small orbit, modestly sized teeth, a relatively l

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Dommergues, Jean-Louis, Sophie Montuire, and Pascal Neige. "Size patterns through time: the case of the Early Jurassic ammonite radiation." Paleobiology 28, no. 4 (2002): 423–34. http://dx.doi.org/10.1666/0094-8373(2002)028<0423:sptttc>2.0.co;2.

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The shell size of 1236 ammonite species representing all known Early Jurassic faunas is analyzed. Size patterns are studied for the entire period and then at the biozone scale for the first four stages of the Jurassic (28 Myr), during which ammonites recovered from the crisis at the Triassic/Jurassic (T/J) boundary. Our analysis reveals that (1) a size continuum (normal distribution from “dwarfs” to “giants”) exists for all Early Jurassic ammonites; (2) although there are no sustained trends (e.g., no Cope's rule), the succession is not monotonous and patterns may differ conspicuously from one

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Royo-Torres, Rafael, Alberto Cobos, Pedro Mocho, and Luis Alcalá. "Origin and evolution of turiasaur dinosaurs set by means of a new ‘rosetta’ specimen from Spain." Zoological Journal of the Linnean Society 191, no. 1 (2020): 201–27. http://dx.doi.org/10.1093/zoolinnean/zlaa091.

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Abstract Turiasauria is a non-neosauropod eusauropod clade of dinosaurs known since 2006, when the description of Turiasaurus was published. This group, including Losillasaurus, was originally thought to have been restricted to the Late Jurassic of Spain. However, over the last decade, our knowledge of this group has improved with the discovery of new taxa such as Zby from the Portuguese Late Jurassic, Tendaguria from the Tanzanian Late Jurassic and Mierasaurus and Moabosaurus from the Early Cretaceous of the USA. Here, we describe a new specimen of Losillasaurus from Spain, which allows us to

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Kelly, Richard S., Andrew J. Ross, and Edmund A. Jarzembowski. "Earwigs (Dermaptera) from the Mesozoic of England and Australia, described from isolated tegmina, including the first species to be named from the Triassic." Earth and Environmental Science Transactions of the Royal Society of Edinburgh 107, no. 2-3 (2016): 129–43. http://dx.doi.org/10.1017/s1755691017000329.

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ABSTRACTDermaptera (earwigs) are described from the Triassic of Australia and England, and from the Jurassic and Cretaceous of England. Phanerogramma heeri (Giebel) is transferred from Coleoptera and it and Brevicula gradus Whalley are re-described. Seven new taxa are named based on tegmina: Phanerogramma australis sp. nov. and P. dunstani sp. nov. from the Late Triassic of Australia; P. gouldsbroughi sp. nov. from the Triassic/Jurassic of England; Brevicula maculata sp. nov. and Trivenapteron moorei gen. et sp. nov. from the Early Jurassic of England; and Dimapteron corami gen et sp. nov. and

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Sapunov, Ivo, Platon Tchoumatchenco, A. Atanasov, and A. Marinkov. "Central North Bulgaria during the Jurassic." Geologica Balcanica 21, no. 5 (1991): 3–68. http://dx.doi.org/10.52321/geolbalc.21.5.3.

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During the Early-Middle Jurassic Central North Bulgaria belonged to the Moesian Early-Middle Jurassic Platform. Even as early as the Hettangian it gradually started sinking. As a result of this a marine ingression started over its lowermost grabens. Within limited areas the marine ingression was preceded by continental accumulation of swamp and lake sediments. The link between the marine basin and the Vardar Ocean was the strait along the Tundža Diagonal Early-Middle Jurassic Fault-Angle Valley (=tilt-block basin) which was orientated towards the southeast-northwest. The fault-angle valley dem

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Zhongjie, Xu, Kong Jintao, Cheng Rihui, Lan Yizhi, and Wang Liaoliang. "LA-ICP-MS U–Pb ages of detrital zircons from Middle Jurassic sedimentary rocks in southwestern Fujian: Sedimentary provenance and its geological significance." Open Geosciences 12, no. 1 (2020): 958–76. http://dx.doi.org/10.1515/geo-2020-0185.

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AbstractIn order to determine the tectonic regime change of the early Mesozoic in the South China Block, this study analyzed sedimentary rocks in the Middle Jurassic of southwestern Fujian by modal analysis of sandstones, elemental geochemical analysis of mudstones, and detrital zircons U–Pb dating. The results show that the detrital zircons in Southwestern Fujian mainly consist of Paleoproterozoic to early Mesozoic zircons in the Middle Jurassic. Within the Dongkeng profile of the Zhangping Formation, DK5 sample (lower part) showed a major age peak at ca. 1,848 Ma and two secondary age peaks

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Sun, Nai Quan. "Characteristics of Yichun Late Triassic - Early Jurassic Monzogranite." Applied Mechanics and Materials 135-136 (October 2011): 353–58. http://dx.doi.org/10.4028/www.scientific.net/amm.135-136.353.

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As building material, Granite has been extensively used. It is important to clear the geochemical characteristics of granites. The paper introduce the Late Triassic-Early Jurassic monzogranite, it mainly located in the south of Yichun area, which were intruded by medium grain monzogranite and syenogranite in Late Triassic-Early Jurassic. According to previous information, this granite distributed in Tangwanghe is widely in the south of study region. Rock type is coarse-medium grain porphyritic biotite monzogranite amphibole-bearing, the edge of the granite (Yishan Forest western) with a flow s

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Anquetin, Jérémy, Paul M. Barrett, Marc E. H. Jones, Scott Moore-Fay, and Susan E. Evans. "A new stem turtle from the Middle Jurassic of Scotland: new insights into the evolution and palaeoecology of basal turtles." Proceedings of the Royal Society B: Biological Sciences 276, no. 1658 (2008): 879–86. http://dx.doi.org/10.1098/rspb.2008.1429.

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The discovery of a new stem turtle from the Middle Jurassic (Bathonian) deposits of the Isle of Skye, Scotland, sheds new light on the early evolutionary history of Testudinata. Eileanchelys waldmani gen. et sp. nov. is known from cranial and postcranial material of several individuals and represents the most complete Middle Jurassic turtle described to date, bridging the morphological gap between basal turtles from the Late Triassic–Early Jurassic and crown-group turtles that diversify during the Late Jurassic. A phylogenetic analysis places the new taxon within the stem group of Testudines (

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Ferrari, Mariel. "Early Jurassic Caenogastropoda and Architectibranchia from the Neuquén Basin, Argentina." Journal of Paleontology 91, no. 2 (2017): 245–64. http://dx.doi.org/10.1017/jpa.2016.138.

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AbstractEarly Jurassic marine gastropods are well represented in Argentina by three major taxa: Vetigastropoda, Caenogastropoda and Architectibranchia (=Opisthobranchia). The present paper aims at the description of six new caenogastropod species and one new architectibranch species from the Early Jurassic marine deposits of the Neuquén Basin, namelyProcerithium subimbricatumn. sp.,Microschiza weaverin. sp.,Naricopsina aequabilisn. sp.,Naricopsina ballentaen. sp.,Pictavia rothin. sp.,Oonia acutan. sp., andCylindrobullina brevispiran. sp. Seven other caenogastropods are reported for the first t

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Mortimer, N., P. van der Heyden, R. L. Armstrong, and J. Harakal. "U–Pb and K–Ar dates related to the timing of magmatism and deformation in the Cache Creek terrane and Quesnellia, southern British Columbia." Canadian Journal of Earth Sciences 27, no. 1 (1990): 117–23. http://dx.doi.org/10.1139/e90-009.

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U–Pb dating of zircon from the Guichon Creek batholith indicates an emplacement age of 210 ± 3 Ma. Comparison with previously published K–Ar (211–188 Ma) and Rb–Sr (205 and 196 Ma) dates reveals that intrusion, mineralization, cooling, and uplift of the batholith took some 20 Ma, spanning the Triassic–Jurassic boundary on the Decade of North American Geology (DNAG) time scale.The Mount Martley pluton and Tiffin Creek stock yield Late Jurassic dates of 155 ± 2 Ma (U–Pb, zircon) and 152 ± 5 Ma (K–Ar, hornblende), respectively, and provide a reliable minimum age (Kimmeridgian) for penetrative def

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Brusatte, Stephen L., Michael J. Benton, Marcello Ruta, and Graeme T. Lloyd. "The first 50 Myr of dinosaur evolution: macroevolutionary pattern and morphological disparity." Biology Letters 4, no. 6 (2008): 733–36. http://dx.doi.org/10.1098/rsbl.2008.0441.

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The evolutionary radiation of dinosaurs in the Late Triassic and Early Jurassic was a pivotal event in the Earth's history but is poorly understood, as previous studies have focused on vague driving mechanisms and have not untangled different macroevolutionary components (origination, diversity, abundance and disparity). We calculate the morphological disparity (morphospace occupation) of dinosaurs throughout the Late Triassic and Early Jurassic and present new measures of taxonomic diversity. Crurotarsan archosaurs, the primary dinosaur ‘competitors’, were significantly more disparate than di

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Li, Xianghui, Jingyu Wang, Troy Rasbury, Min Zhou, Zhen Wei, and Chaokai Zhang. "Early Jurassic climate and atmospheric CO<sub>2</sub> concentration in the Sichuan paleobasin, southwestern China." Climate of the Past 16, no. 6 (2020): 2055–74. http://dx.doi.org/10.5194/cp-16-2055-2020.

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Abstract. Climatic oscillations have been developed through the (Early) Jurassic from marine sedimentary archives but remain unclear from terrestrial records. This work presents investigation of climate-sensitive sediments and carbon and oxygen isotope analyses of lacustrine and pedogenic carbonates for the Early Jurassic Ziliujing Formation taken from the Basin in southwestern China. Sedimentary and stable isotope proxies manifest that an overall secular (semi)arid climate dominated the Sichuan Basin during the Early Jurassic, except for the Hettangian. This climate pattern is similar to the

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Girard, Vincent, Simona Saint Martin, Eric Buffetaut, et al. "Thai amber: insights into early diatom history?" BSGF - Earth Sciences Bulletin 191 (2020): 23. http://dx.doi.org/10.1051/bsgf/2020028.

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The origin of the diatoms still remains enigmatic. Their fossil record is scarce until the Late Cretaceous and great divergences exist between molecular data and the earliest fossil evidence. While molecular data indicate an origin during the Triassic or Early Jurassic, early fossil evidence is only from the Late Jurassic-Early Cretaceous. The discovery of diatoms in French mid-Cretaceous amber by the end of the 2000s already suggested a potential bias in the diatom fossil record as it made older many diatom lineages, the record of which hitherto began at the end of the Cretaceous. The Jurassi

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Tchoumatchenco, Platon. "Palaeoenvironments of northwestern Bulgaria and northeastern Serbia during the Jurassic." Geologica Balcanica 49, no. 1 (2020): 67–72. http://dx.doi.org/10.52321/geolbalc.49.1.67.

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Jurassic rocks in the Danube Region of northwestern Bulgaria and northeastern Serbia have been the subject of numerous earlier studies that have shown notable similarities between their sedimentary facies and depositional environments. In terms of regional palaeotectonic zonation, this area represents the westernmost parts of the Vidin Early–Middle Jurassic Complex Horst and the Mihaylovgrad Early–Middle Jurassic Graben in NW Bulgaria, as well as the easternmost part of the Lower Danubicum in NE Serbia, which collectively take part of the Jurassic Moesian Platform. For compiling an overall con

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Tchoumatchenco, Platon. "Palaeoenvironments of northwestern Bulgaria and northeastern Serbia during the Jurassic." Geologica Balcanica 49, no. 1 (2020): 67–72. https://doi.org/10.52321/GeolBalc.49.1.67.

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Jurassic rocks in the Danube Region of northwestern Bulgaria and northeastern Serbia have been the subject of numerous earlier studies that have shown notable similarities between their sedimentary facies and depositional environments. In terms of regional palaeotectonic zonation, this area represents the westernmost parts of the Vidin Early–Middle Jurassic Complex Horst and the Mihaylovgrad Early–Middle Jurassic Graben in NW Bulgaria, as well as the easternmost part of the Lower Danubicum in NE Serbia, which collectively take part of the Jurassic Moesian Platform. For compiling an

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Skutschas, P. P., T. Martin, and Sun Ge. "The co-occurence of non-lissamphibian temnospondyls and salamanders in the late Jurassic of the southern Junggar Basin (Xinjiang Autonomous Region, NW China)." Proceedings of the Zoological Institute RAS 313, no. 2 (2009): 143–48. http://dx.doi.org/10.31610/trudyzin/2009.313.2.143.

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So far, the Jurassic co-occurrence of non-lissamphibian temnospondyls and early temnospondyl lissamphibians was known only for the Middle Jurassic Balabansai Svita in the Fergana Depression, Kyrgyzstan and the Peski Quarry near Moscow, Russia. Here we report the co-occurrence of non-lissamphibian temnospondyls and lissamphibians (salamanders) from the Late Jurassic (Oxfordian) Qigu Formation of the Liuhuanggou locality in the southern Junggar Basin, China. This represents a considerable temporal and geographical range extension for the nonlissamphibian temnospondyl-early lissamphibian faunal a

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Sapunov, Ivo, Platon Tchoumatchenco, and Vladimir Shopov. "The Lower Jurassic in the Troyan Region and the south-eastern part of the Teteven Region, Central Balkanids (brachiopod-, bivalve-, and ammonite stratigraphy and palaeotectonics)." Geologica Balcanica 26, no. 3 (1996): 3–19. http://dx.doi.org/10.52321/geolbalc.26.3.3.

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As a result of the biostratigraphic study of brachiopods, bivalves and ammonites made in eight instructive sections it was established that most of the Lower Jurassic rock sequences were more or less incomplete. The sections in the valleys of the rivers Kostina and Cherna Reka, Teteven Region, are most complete (from Hettangian to Toarcian). They are situated in the central, the most deeply sinking block one – called Kostina Step of the Izdremets Complex Graben of the Moesian Early-Middle Jurassic Platform. There, the most deep-sea Early Jurassic distal facies were existing. The section near t

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Hesselbo, Stephen P., Aisha Al-Suwaidi, Sarah J. Baker, et al. "Initial results of coring at Prees, Cheshire Basin, UK (ICDP JET project): towards an integrated stratigraphy, timescale, and Earth system understanding for the Early Jurassic." Scientific Drilling 32 (October 26, 2023): 1–25. http://dx.doi.org/10.5194/sd-32-1-2023.

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Abstract. Drilling for the International Continental Scientific Drilling Program (ICDP) Early Jurassic Earth System and Timescale project (JET) was undertaken between October 2020 and January 2021. The drill site is situated in a small-scale synformal basin of the latest Triassic to Early Jurassic age that formed above the major Permian–Triassic half-graben system of the Cheshire Basin. The borehole is located to recover an expanded and complete succession to complement the legacy core from the Llanbedr (Mochras Farm) borehole drilled through 1967–1969 on the edge of the Cardigan Bay Basin, No

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Wang, Yu, Haoyuan Lan, Chong Jin, and Yuhuang Zhang. "Petrogenesis of Middle Jurassic Syenite-Granite Suites and Early Cretaceous Granites with Associated Enclaves in Southwestern Zhejiang, SE China: Implications for Subduction-Related Tectonic Evolution Beneath Northeastern Cathaysia Block." Minerals 15, no. 5 (2025): 474. https://doi.org/10.3390/min15050474.

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Late Mesozoic magmatism in Southeast China extensively reworked the Cathaysia Block’s crust, linked to the Paleo-Pacific Plate subduction beneath East Asia. The northeastern Cathaysia Block, largely covered by Cretaceous volcanic-sedimentary basins, has limited Jurassic exposure to Early Cretaceous intrusions, which provides critical insights into deep crust-mantle processes. In this study, we present zircon U-Pb geochronology and Hf isotope, whole-rock geochemistry, and Sr-Nd isotopes of the Middle Jurassic syenite-granite suites and Early Cretaceous granites with enclaves in the Qingyuan are

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Fischer, Valentin, Robert Weis, and Ben Thuy. "Refining the marine reptile turnover at the Early–Middle Jurassic transition." PeerJ 9 (February 22, 2021): e10647. http://dx.doi.org/10.7717/peerj.10647.

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Even though a handful of long-lived reptilian clades dominated Mesozoic marine ecosystems, several biotic turnovers drastically changed the taxonomic composition of these communities. A seemingly slow paced, within-geological period turnover took place across the Early–Middle Jurassic transition. This turnover saw the demise of early neoichthyosaurians, rhomaleosaurid plesiosaurians and early plesiosauroids in favour of ophthalmosaurid ichthyosaurians and cryptoclidid and pliosaurid plesiosaurians, clades that will dominate the Late Jurassic and, for two of them, the entire Early Cretaceous as

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