Geochronology is the science of determining the age of rocks , fossils , and sediments using signatures inherent in the rocks themselves. Absolute geochronology can be accomplished through radioactive isotopes , whereas relative geochronology is provided by tools such as paleomagnetism and stable isotope ratios . By combining multiple geochronological (and biostratigraphic ) indicators the precision of the recovered age can be improved.
41-544: (Redirected from Zhuganpo Member ) Triassic geologic unit in southern China Zhuganpo Formation Stratigraphic range : Upper Ladinian - Lower Carnian Type Geological formation Underlies Xiaowa Formation Overlies Yangliujing Formation Lithology Primary limestone , marl Location Region Guizhou Province , Yunnan Province Country China Extent Yunnan–Guizhou Plateau The Zhuganpo Formation
82-2140: A Ladinian to Carnian age for the sediments of the formation. Paleobiota [ edit ] Invertebrates [ edit ] Ammonites : Clionitites sp., Detoniceras sp., Haoceras xingyiense , Parasturia sp., Protrachyceras sp., Ptychites sp., Sinomeginoceras ( S. wangi, S. xingyiense ), Trachyceras sp., Xenoprotrachyceras cf. primum , Yangites densicostatus , Bivalves : Daonella sp. Conodonts : Gladigondolella malayensis , Metapolygnathus / Paragondolella / Quadralella ( Q. aff . acuminatus, P. foliata, P. inclinata, Q. intermedius, Q. langdaiensis, P. maantangensis, P. navicula, M. nodosus, M. parafoliata, Q. aff . praelindae, P. polygnathiformis, Q. shijiangjunensis, Q. tadpole, Q. uniformis, Q. wanlanensis, Q. aff . wayaoensis, Q. yongueensis, Q. aff. zonneveldi ) Crinoids : Traumatocrinus hsui Crustaceans ("shrimps"): Schimperella acanthocercus ( Lophogastrida ) Fish [ edit ] Acrolepidae indet. Archaesemionotus sp . aff. Arctacanthus sp. ( Chimaeriformes ?) Asialepidotus shingyiensis ( Ionoscopiformes ) Birgeria liui Caturidae indet. Eosemionotus sp . Favusodus orientalis ( Euselachii ) Fuyuanichthys wangi ( Ginglymodi ) Fuyuanperleidus dengi Guizhouamia bellula Guizhoubrachysomus minor Guizhoucoelacanthus guanlingensis Guizhouniscus microlepidus Habroichthys sp . Keichouodus nimaiguensis (Euselachii) Luganoia fortuna ( Luganoiidae ) Malingichthys ( M. nimaiguensis, M. wanfendlinensis ; Pholidophoridae ) Marcopoloichthys sp . Peltopleurus (P. orientalis, P. tyrannos) Peripeltopleurus sp . ( Wushaichthyidae ) Pholidophoridae indet. Potanichthys xingyiensis ( Thoracopteridae ) Rosaodus xingyiensis ( Elasmobranchii ) Saurichthys sp . Sinoeugnathus kueichowensis Wushaichthys exquisitus (Wushaichthyidae) Xingyia gracilis Reptiles [ edit ] Reptiles of
123-1898: A basal phytosaur Dingxiaosaurus D. luyinensis A pistosauroid of uncertain validity. Previously believed to have been from the Yangliujing Formation . Fuyuansaurus F. acutirostris A " protorosaur " archosauromorph , possibly a tanystropheid Glyphoderma G. kangi A placochelyid placodont Guizhouichthyosaurus G. sp. A large predatory merriamosaurian ichthyosaur Keichousaurus K. hui A keichousaurid pachypleurosaur Lariosaurus L. xingyiensis A small nothosaur Litorosuchus L. somnii A semiaquatic archosauriform related to Vancleavea campi Macrocnemus M. fuyuanensis A small basal tanystropheid Nothosaurus N. youngi A large nothosaur Qianichthyosaurus Q. xingyiensis A small toretocnemid ichthyosaur Qianxisaurus Q. chajiangensis A basal eosauropterygian , possibly related to pachypleurosaurs or nothosaurs Tanystropheus T. cf. hydroides A large tanystropheid, previously classified as T. cf. longobardicus T. sp. A small tanystropheid, previously classified as T. cf. longobardicus Wangosaurus W. brevirostris A pistosauroid Xinpusaurus X. xingyiensis A thalattosauroid thalattosaur Yunguisaurus Y. liae A pistosauroid References [ edit ] ^ Benton, Michael J.; Zhang, Qiyue; Hu, Shixue; Chen, Zhong-Qiang; Wen, Wen; Liu, Jun; Huang, Jinyuan; Zhou, Changyong; Xie, Tao; Tong, Jinnan; Choo, Brian (2013-10-01). "Exceptional vertebrate biotas from
164-516: A chimaeran . Some have attributed these to teeth or hybodont cephalic spines. Similar ichthyoliths of much smaller size have been found in Japan and China in rocks of Anisian age. The large difference in age, location, and size means their attribution to this genus is uncertain; nonetheless, the species A. exiguus was named in Japan. This article about a prehistoric cartilaginous fish
205-775: A proxy for the age at which a surface, such as an alluvial fan, was created. Burial dating uses the differential radioactive decay of 2 cosmogenic elements as a proxy for the age at which a sediment was screened by burial from further cosmic rays exposure. Luminescence dating techniques observe 'light' emitted from materials such as quartz, diamond, feldspar, and calcite. Many types of luminescence techniques are utilized in geology, including optically stimulated luminescence (OSL), cathodoluminescence (CL), and thermoluminescence (TL). Thermoluminescence and optically stimulated luminescence are used in archaeology to date 'fired' objects such as pottery or cooking stones and can be used to observe sand migration. Incremental dating techniques allow
246-487: A reference for newly obtained poles for the rocks with unknown age. For paleomagnetic dating, it is suggested to use the APWP in order to date a pole obtained from rocks or sediments of unknown age by linking the paleopole to the nearest point on the APWP. Two methods of paleomagnetic dating have been suggested: (1) the angular method and (2) the rotation method. The first method is used for paleomagnetic dating of rocks inside of
287-726: Is a Triassic geologic unit found in southern China . It has historically been known as the Zhuganpo Member of the Falang Formation. A diverse fossil assemblage known as the Xingyi biota or Xingyi Fauna can be found in the upper part of the Zhuganpo Formation. Fossils of the Xingyi biota include articulated skeletons of marine reptiles, abundant fish, and a plentiful assortment of invertebrates indicating
328-730: Is also correct to say that fossils of the genus Tyrannosaurus have been found in the Upper Cretaceous Series. In the same way, it is entirely possible to go and visit an Upper Cretaceous Series deposit – such as the Hell Creek deposit where the Tyrannosaurus fossils were found – but it is naturally impossible to visit the Late Cretaceous Epoch as that is a period of time. Arctacanthus Dolophonodus Branson, 1932 Arctacanthus
369-500: Is also often used as a dating tool in archaeology, since the dates of some eruptions are well-established. Geochronology, from largest to smallest: It is important not to confuse geochronologic and chronostratigraphic units. Geochronological units are periods of time, thus it is correct to say that Tyrannosaurus rex lived during the Late Cretaceous Epoch. Chronostratigraphic units are geological material, so it
410-577: Is an extinct genus of cartilaginous fish from the Permian and possibly Triassic periods. Arctacanthus is known by two named species from the Permian, A. uncinatus and A. wyomingensis . The former was described from Greenland while the latter was described from the United States . They are known only by isolated hook-shaped " ichthyoliths " thought to represent dermal denticles of
451-461: Is different in application from biostratigraphy, which is the science of assigning sedimentary rocks to a known geological period via describing, cataloging and comparing fossil floral and faunal assemblages. Biostratigraphy does not directly provide an absolute age determination of a rock, but merely places it within an interval of time at which that fossil assemblage is known to have coexisted. Both disciplines work together hand in hand, however, to
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#1732793724875492-532: The Ar/ Ar dating method can be extended into the time of early human life and into recorded history. Some of the commonly used techniques are: A series of related techniques for determining the age at which a geomorphic surface was created ( exposure dating ), or at which formerly surficial materials were buried (burial dating). Exposure dating uses the concentration of exotic nuclides (e.g. Be, Al, Cl) produced by cosmic rays interacting with Earth materials as
533-750: The Ladinian (Middle Triassic) Zhuganpo Member, Falang Formation, Guizhou, China and the restudy of Dingxiaosaurus" . Palaeoworld . 29 (1): 137–150. doi : 10.1016/j.palwor.2019.05.006 . S2CID 181711576 . ^ Fraser, Nicholas C.; Rieppel, Olivier; Chun, Li (2013). "A long-snouted protorosaur from the Middle Triassic of southern China" . Journal of Vertebrate Paleontology . 33 (5): 1120–1126. Bibcode : 2013JVPal..33.1120F . doi : 10.1080/02724634.2013.764310 . ISSN 0272-4634 . S2CID 83521468 . ^ Ezcurra, Martín D.; Butler, Richard J. (2018-06-13). "The rise of
574-490: The Ladinian (Middle Triassic) of Xingyi, Guizhou, southwestern China" . Journal of Vertebrate Paleontology . 36 (6): e1218340. Bibcode : 2016JVPal..36E8340L . doi : 10.1080/02724634.2016.1218340 . ISSN 0272-4634 . S2CID 132418823 . ^ Sato, Tamaki; Zhao, Li-Jun; Wu, Xiao-Chun; Li, Chun (2014). Ruta, Marcello (ed.). "A new specimen of the Triassic pistosauroid Yunguisaurus, with implications for
615-547: The Ladinian–Carnian interval of South China" . Papers in Palaeontology . 8 (1). Bibcode : 2022PPal....8E1404L . doi : 10.1002/spp2.1404 . ISSN 2056-2799 . S2CID 241980979 . ^ Xu, Guang-Hui; Ma, Xin-Ying (2018-01-27). "Redescription and phylogenetic reassessment of Asialepidotus shingyiensis (Holostei: Halecomorphi) from the Middle Triassic (Ladinian) of China" . Zoological Journal of
656-741: The Linnean Society . 184 (1): 95–114. doi : 10.1093/zoolinnean/zlx105 . ISSN 0024-4082 . ^ Ni, Peigang; Tintori, Andrea; Sun, Zuoyu; Lombardo, Cristina; Jiang, Dayong (2019-12-01). "Postcranial skeleton of Birgeria liui (Osteichthyes, Actinopterygii) from the Longobardian (Ladinian, Middle Triassic) of Xingyi, Guizhou, South China" . Swiss Journal of Geosciences . 112 (2): 307–324. doi : 10.1007/s00015-018-0329-0 . ISSN 1661-8734 . S2CID 135305199 . ^ Xu, Guang-Hui; Ma, Xin-Ying; Ren, Yi (2018-12-20). "Fuyuanichthys wangi gen. et sp. nov. from
697-994: The Middle Triassic (Ladinian) of China highlights the early diversification of ginglymodian fishes" . PeerJ . 6 : e6054. doi : 10.7717/peerj.6054 . ISSN 2167-8359 . PMC 6304272 . PMID 30595977 . ^ Guang-Hui, Xu (2020). "A new species of Luganoia (Luganoiidae, Neopterygii) from the Middle Triassic Xingyi Biota, Guizhou, China" (PDF) . Vertebrata PalAsiatica . 58 (4): 267–282. doi : 10.19615/j.cnki.1000-3118.200624 . ^ TINTORI, ANDREA; SUN, ZUOYU; NI, PEIGANG; LOMBARDO, CRISTINA; JIANG, DAYONG; MOTANI, RYOSUKE (2015-11-19). "OLDEST STEM TELEOSTEI FROM THE LATE LADINIAN (MIDDLE TRIASSIC) OF SOUTHERN CHINA" . Rivista italiana di Paleontologia e Stratigrafia . 121 : 3. doi : 10.13130/2039-4942/6519 . ^ Xu Guang-Hi, Ma Xin-Ying, Zhao Li-Jun (2018). "A large peltopleurid fish (Actinopterygii: Peltopleuriformes) from
738-1494: The Middle Triassic of China shows the earliest over-water gliding strategy of the vertebrates" . Proceedings of the Royal Society B: Biological Sciences . 280 (1750): 20122261. doi : 10.1098/rspb.2012.2261 . PMC 3574442 . PMID 23118437 . ^ Xu, Guang-Hui; Zhao, Li-Jun; Shen, Chen-Chen (2015). "A Middle Triassic thoracopterid from China highlights the evolutionary origin of overwater gliding in early ray-finned fishes" . Biology Letters . 11 (1): 20140960. doi : 10.1098/rsbl.2014.0960 . ISSN 1744-9561 . PMC 4321159 . PMID 25568155 . ^ Cheng, L.; Chen, X.; Wang, C. (2007). "A new species of Late Triassic Anshunsaurus (Reptilia: Thalattosauria) from Guizhou Province" . Acta Geologica Sinica (in Chinese). 81 (10): 1345–1351. ^ Long, Cheng; Xiaohong, Chen; Baomin, Zhang; Yongjian, Cai (2011). "New Study of Anshunsaurus huangnihensis Cheng, 2007 (Reptilia: Thalattosauria): Revealing its Transitional Position in Askeptosauridae" . Acta Geologica Sinica - English Edition . 85 (6): 1231–1237. Bibcode : 2011AcGlS..85.1231C . doi : 10.1111/j.1755-6724.2011.00584.x . S2CID 129819570 . ^ Rieppel, O.; Liu, J.; Li, C. (2006). "A new species of
779-731: The Middle Triassic of Guizhou, China" . Journal of Vertebrate Paleontology . 34 (2): 465–470. Bibcode : 2014JVPal..34..465J . doi : 10.1080/02724634.2013.808204 . ISSN 0272-4634 . S2CID 84886121 . ^ Yang, P.F., Ji, C., Jiang, D.Y., Motani, R., Tintori, A., Sun, Y.L., Sun, Z.Y. (2013). "A new species of Qianichthyosaurus (Reptilia: Ichthyosauria) from Xingyi Fauna (Ladinian, Middle Triassic) of Guizhou". Acta Scientiarum Naturalium Universitatis Pekinensis (in Chinese). 49 : 1002–1008. {{ cite journal }} : CS1 maint: multiple names: authors list ( link ) ^ Cheng, Y. N.; Wu, X. C.; Sato, T.; Shan, H. Y. (2012). "A new eosauropterygian (Diapsida, Sauropterygia) from
820-744: The Middle Triassic of Yunnan and Guizhou, China" . Vertebrata PalAsiatica . 56 (2): 106–120. doi : 10.19615/j.cnki.1000-3118.171225 . {{ cite journal }} : CS1 maint: multiple names: authors list ( link ) ^ Shen, Chenchen; Arratia, Gloria (2021-10-02). "Re-description of the sexually dimorphic peltopleuriform fish Wushaichthys exquisitus (Middle Triassic, China): taxonomic implications and phylogenetic relationships" . Journal of Systematic Palaeontology . 19 (19): 1317–1342. Bibcode : 2021JSPal..19.1317S . doi : 10.1080/14772019.2022.2029595 . ISSN 1477-2019 . S2CID 247731689 . ^ Xu, G. -H.; Zhao, L. -J.; Gao, K. -Q.; Wu, F. -X. (2012). "A new stem-neopterygian fish from
861-881: The Triassic of China" . Canadian Journal of Earth Sciences . 40 (4): 621–634. Bibcode : 2003CaJES..40..621R . doi : 10.1139/e02-067 . ^ Wen-Bin Lin; Da-Yong Jiang; Olivier Rieppel; Ryosuke Motani; Cheng Ji; Andrea Tintori; Zuo-Yu Sun; Min Zhou (2017). "A new specimen of Lariosaurus xingyiensis (Reptilia, Sauropterygia) from the Ladinian (Middle Triassic) Zhuganpo Member, Falang Formation, Guizhou, China" . Journal of Vertebrate Paleontology . 37 (2). e1278703. Bibcode : 2017JVPal..37E8703L . doi : 10.1080/02724634.2017.1278703 . S2CID 90181915 . ^ Li, Chun; Wu, Xiao-chun; Zhao, Li-jun; Nesbitt, Sterling J.; Stocker, Michelle R.; Wang, Li-Ting (2016-11-09). "A new armored archosauriform (Diapsida: Archosauromorpha) from
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#1732793724875902-794: The Triassic of China". Journal of Vertebrate Paleontology . 32 (6): 1335. Bibcode : 2012JVPal..32.1335C . doi : 10.1080/02724634.2012.695983 . S2CID 85253142 . ^ Spiekman, Stephan N. F.; Neenan, James M.; Fraser, Nicholas C.; Fernandez, Vincent; Rieppel, Olivier; Nosotti, Stefania; Scheyer, Torsten M. (2020-11-20). "The cranial morphology of Tanystropheus hydroides (Tanystropheidae, Archosauromorpha) as revealed by synchrotron microtomography" . PeerJ . 8 : e10299. doi : 10.7717/peerj.10299 . ISSN 2167-8359 . PMC 7682440 . PMID 33240633 . ^ Rieppel, Olivier; Jiang, Da-Yong; Fraser, Nicholas C.; Hao, Wei-Cheng; Motani, Ryosuke; Sun, Yuan-Lin; Sun, Zuo-Yu (2010). " Tanystropheus cf. T. Longobardicus from
943-851: The Triassic of China, and the expansion of marine ecosystems after the Permo-Triassic mass extinction" . Earth-Science Reviews . 125 : 199–243. Bibcode : 2013ESRv..125..199B . doi : 10.1016/j.earscirev.2013.05.014 . ISSN 0012-8252 . ^ Lu, Hao; Jiang, Da-Yong; Motani, Ryosuke; Ni, Pei-Gang; Sun, Zuo-Yu; Tintori, Andrea; Xiao, Shi-Zhen; Zhou, Min; Ji, Cheng; Fu, Wan-Lu (2018). "Middle Triassic Xingyi Fauna: Showing turnover of marine reptiles from coastal to oceanic environments" . Palaeoworld . 27 (1): 107–116. doi : 10.1016/j.palwor.2017.05.005 . ^ Xiaodong Xu, Marco Balini, Da-Yong Jiang, Andrea Tintori, Zuo-Yu Sun, Yuan-Lin Sun (2015). "Ammonoids from
984-692: The Zhuganpo Formation Genus Species Notes Images Anshunsaurus A. huangnihensis An askeptosauroid thalattosaur [REDACTED] Diandongosuchus fuyuanensis [REDACTED] Keichousaurus hui [REDACTED] Guizhouichthyosaurus A. wushaensis An askeptosauroid thalattosaur Brevicaudosaurus B. jiyangshanensis A small nothosaur with an unusually short torso and tail Diandongosuchus D. fuyuanensis A semiaquatic archosauriform , interpreted as
1025-1966: The Zhuganpo Member of the Falang Formation at Nimaigu and their relevance for dating the Xingyi Fossil-Lagerstatte (Late Ladinian, Guizhou, China)" . Rivista Italiana di Paleontologia e Stratigrafia . 121 (2): 135–161. {{ cite journal }} : CS1 maint: multiple names: authors list ( link ) ^ Sun, Zuoyu; Jiang, Dayong; Ji, Cheng; Hao, Weicheng (2016). "Integrated biochronology for Triassic marine vertebrate faunas of Guizhou Province, South China" . Journal of Asian Earth Sciences . 118 : 101–110. Bibcode : 2016JAESc.118..101S . doi : 10.1016/j.jseaes.2016.01.004 . ^ Zhang, Z. T.; Sun, Y. D.; Lai, X. L.; Joachimski, M. M.; Wignall, P. B. (2017-11-15). "Early Carnian conodont fauna at Yongyue, Zhenfeng area and its implication for Ladinian-Carnian subdivision in Guizhou, South China" . Palaeogeography, Palaeoclimatology, Palaeoecology . The Palaeozoic-Mesozoic Transition in South China: Oceanic Environments and Life from Late Permian to Late Triassic. 486 : 142–157. Bibcode : 2017PPP...486..142Z . doi : 10.1016/j.palaeo.2017.02.011 . ISSN 0031-0182 . ^ Taylor, Rod S.; Schram, Frederick R.; Yan-Bin, Shen (2001). "A new upper Middle Triassic shrimp (Crustacea: Lophogastrida) from Guizhou, China, with discussion regarding other fossil "mysidaceans" " . Journal of Paleontology . 75 (2): 310–318. doi : 10.1666/0022-3360(2001)075<0310:ANUMTS>2.0.CO;2 . ISSN 0022-3360 . S2CID 131509616 . ^ Li, Jiachun; Sun, Zuoyu; Cuny, Gilles; Ji, Cheng; Jiang, Dayong; Zhou, Min (2022). Cavin, Lionel (ed.). "An unusual shark assemblage from
1066-409: The amount of radioactive decay of a radioactive isotope with a known half-life , geologists can establish the absolute age of the parent material. A number of radioactive isotopes are used for this purpose, and depending on the rate of decay, are used for dating different geological periods. More slowly decaying isotopes are useful for longer periods of time, but less accurate in absolute years. With
1107-436: The construction of year-by-year annual chronologies, which can be fixed ( i.e. linked to the present day and thus calendar or sidereal time ) or floating. A sequence of paleomagnetic poles (usually called virtual geomagnetic poles), which are already well defined in age, constitutes an apparent polar wander path (APWP). Such a path is constructed for a large continental block. APWPs for different continents can be used as
1148-408: The early Late Triassic of Guizhou Province, southwestern China". Journal of Vertebrate Paleontology . 30 (4): 1082–1089. Bibcode : 2010JVPal..30.1082R . doi : 10.1080/02724634.2010.483548 . JSTOR 40864387 . S2CID 86315078 . ^ Ma, Le-Tian; Jiang, Da-Yong; Rieppel, Olivier; Motani, Ryosuke; Tintori, Andrea (2015-01-02). "A new pistosauroid (Reptilia, Sauropterygia) from
1189-1172: The early evolution of stem archosaurs" . PeerJ . 9 : e11143. doi : 10.7717/peerj.11143 . ISSN 2167-8359 . PMC 8101476 . PMID 33986981 . ^ Zhao, L.-J.; Li, C.; Liu, J.; He, T. (2008). "A new armored placodont from the Middle Triassic of Yunnan Province, Southwestern China" (PDF) . Vertebrata PalAsiatica . 46 (3): 171–177. Archived from the original (PDF) on 3 March 2016. ^ Jiang, D. Y.; Motani, R.; Tintori, A.; Rieppel, O.; Ji, C.; Zhou, M.; Wang, X.; Lu, H.; Li, Z. G. (2020). "Evidence supporting predation of 4-m marine reptile by Triassic megapredator" . iScience . 23 (9): 101347. Bibcode : 2020iSci...23j1347J . doi : 10.1016/j.isci.2020.101347 . PMC 7520894 . PMID 32822565 . ^ Cheng, Yen-nien; Wu, Xiao-chun; Ji, Qiang (2004). "Triassic marine reptiles gave birth to live young" . Nature . 432 (7015): 383–386. Bibcode : 2004Natur.432..383C . doi : 10.1038/nature03050 . ISSN 1476-4687 . PMID 15549103 . S2CID 4391810 . ^ Holmes, Robert; Cheng, Yen-Nien; Wu, Xiao-Chun (2008-03-12). "New information on
1230-416: The exception of the radiocarbon method , most of these techniques are actually based on measuring an increase in the abundance of a radiogenic isotope, which is the decay-product of the radioactive parent isotope. Two or more radiometric methods can be used in concert to achieve more robust results. Most radiometric methods are suitable for geological time only, but some such as the radiocarbon method and
1271-423: The late Ladinian Xingyi marine reptile level, southwestern China" . Journal of Vertebrate Paleontology . 35 (1): e881832. Bibcode : 2015JVPal..35E1832M . doi : 10.1080/02724634.2014.881832 . ISSN 0272-4634 . S2CID 130696958 . ^ Li, Z.-G.; Jiang, D.-Y.; Rieppel, O.; Motani, R.; Tintori, A.; Sun, Z.-Y.; Ji, C. (2016-11-01). "A new species of Xinpusaurus (Reptilia, Thalattosauria) from
Zhuganpo Formation - Misplaced Pages Continue
1312-510: The marine Middle Triassic of China, with implications for the diverse life styles of archosauriforms prior to the diversification of Archosauria" . The Science of Nature . 103 (11): 95. Bibcode : 2016SciNa.103...95L . doi : 10.1007/s00114-016-1418-4 . ISSN 1432-1904 . PMID 27830290 . S2CID 253634068 . ^ Jiang, Da-Yong; Rieppel, Olivier; Fraser, Nicholas C.; Motani, Ryosuke; Hao, Wei-Cheng; Tintori, Andrea; Sun, Yuan-Lin; Sun, Zuo-Yu (2011). "New information on
1353-799: The marine Triassic of China" . Journal of Vertebrate Paleontology . 32 (5): 1064. Bibcode : 2012JVPal..32.1064L . doi : 10.1080/02724634.2012.694383 . S2CID 86797826 . ^ Michelle R. Stocker; Li-Jun Zhao; Sterling J. Nesbitt; Xiao-Chun Wu; Chun Li (2017). "A Short-Snouted, Middle Triassic Phytosaur and its Implications for the Morphological Evolution and Biogeography of Phytosauria" . Scientific Reports . 7 : Article number 46028. Bibcode : 2017NatSR...746028S . doi : 10.1038/srep46028 . PMC 5385495 . PMID 28393843 . ^ Wang, Xue; Lu, Hao; Jiang, Da-Yong; Zhou, Min; Sun, Zuo-Yu (2020). "A new specimen of Yunguisaurus (Reptilia; Sauropterygia) from
1394-867: The origin of Plesiosauria (Reptilia, Sauropterygia)" . Palaeontology . 57 (1): 55–76. Bibcode : 2014Palgy..57...55S . doi : 10.1111/pala.12048 . S2CID 129457774 . Retrieved from " https://en.wikipedia.org/w/index.php?title=Zhuganpo_Formation&oldid=1255359736 " Categories : Geologic formations of China Triassic System of Asia Triassic China Carnian Stage Ladinian Stage Paleontology in Guizhou Paleontology in Yunnan Hidden categories: CS1 maint: multiple names: authors list CS1 Chinese-language sources (zh) Articles with short description Short description with empty Wikidata description Geochronology Geochronology
1435-459: The point where they share the same system of naming strata (rock layers) and the time spans utilized to classify sublayers within a stratum. The science of geochronology is the prime tool used in the discipline of chronostratigraphy , which attempts to derive absolute age dates for all fossil assemblages and determine the geologic history of the Earth and extraterrestrial bodies . By measuring
1476-538: The protorosaurian reptile Macrocnemus fuyuanensis Li et al., 2007, from the Middle/Upper Triassic of Yunnan, China" . Journal of Vertebrate Paleontology . 31 (6): 1230–1237. Bibcode : 2011JVPal..31.1230J . doi : 10.1080/02724634.2011.610853 . ISSN 0272-4634 . S2CID 131615836 . ^ Ji, Cheng; Jiang, Da-Yong; Rieppel, Olivier; Motani, Ryosuke; Tintori, Andrea; Sun, Zuo-Yu (2014-03-01). "A new specimen of Nothosaurus youngi from
1517-461: The ruling reptiles and ecosystem recovery from the Permo-Triassic mass extinction" . Proc. R. Soc. B . 285 (1880): 20180361. doi : 10.1098/rspb.2018.0361 . ISSN 0962-8452 . PMC 6015845 . PMID 29899066 . ^ Spiekman, Stephan N. F.; Fraser, Nicholas C.; Scheyer, Torsten M. (2021-05-03). "A new phylogenetic hypothesis of Tanystropheidae (Diapsida, Archosauromorpha) and other "protorosaurs", and its implications for
1558-426: The same age and of such distinctive composition and appearance that, despite their presence in different geographic sites, there is certainty about their age-equivalence. Fossil faunal and floral assemblages , both marine and terrestrial, make for distinctive marker horizons. Tephrochronology is a method for geochemical correlation of unknown volcanic ash (tephra) to geochemically fingerprinted, dated tephra . Tephra
1599-700: The same continental block. The second method is used for the folded areas where tectonic rotations are possible. Magnetostratigraphy determines age from the pattern of magnetic polarity zones in a series of bedded sedimentary and/or volcanic rocks by comparison to the magnetic polarity timescale. The polarity timescale has been previously determined by dating of seafloor magnetic anomalies, radiometrically dating volcanic rocks within magnetostratigraphic sections, and astronomically dating magnetostratigraphic sections. Global trends in isotope compositions, particularly carbon-13 and strontium isotopes, can be used to correlate strata. Marker horizons are stratigraphic units of
1640-403: The skull of Keichousaurus hui (Reptilia: Sauropterygia) with comments on sauropterygian interrelationships" . Journal of Vertebrate Paleontology . 28 (1): 76–84. doi : 10.1671/0272-4634(2008)28[76:NIOTSO]2.0.CO;2 . ISSN 0272-4634 . S2CID 85868385 . ^ Rieppel, Olivier; Jinling, Li; Jun, Liu (2003). "Lariosaurus xingyiensis (Reptilia: Sauropterygia) from
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