Early Anisian (Middle Triassic) Conodonts from Romania and China, with Comments on Their Role in the Recognition and Correlation of the Base of the Anisian

Abstract

The Olenekian-Anisian Boundary (OAB) interval is an important time in Earth history, reflecting the last phase of marine ecosystem recovery in the aftermath of the end-Permian mass extinction. Despite this, the Global Stratotype Section and Point (GSSP) for the base of the Anisian remains undefined. The first appearance of the conodont Chiosella timorensis has been proposed as a potential index for the boundary; however, the discovery of this conodont with ammonoids traditionally considered to be Spathian has generated doubts about its suitability. The taxonomy and relationships of early Anisian conodonts, including species of Chiosella, remain understudied, which leads to difficulties in correlation. New species of Neogondolella (N. gradinarui) and Magnigondolella (M. n. sp. D) have been recognized from the leading GSSP candidate section for the OAB at Deşli Caira, and from an additional OAB section at Guandao. Furthermore, several species previously identified in Canada and the USA can be recognized from these sections, improving correlation between Tethys and North America. One of these species may serve as a suitable alternative proxy for the OAB; for instance, N. curva appears just below the first Anisian ammonoids in Deşli Caira, and just above the first appearance of C. timorensis in both Deşli Caira and Guandao. Continued work on sections other than the candidate sections, and on the taxonomy of species outside of those traditionally proposed as indices, is required.

Keywords

Olenekian / Anisian / Neogondolella / Magnigondolella / Deşli Caira / Guandao

References

[1] Arthaber G. Die Cephalopodenfauna der Reiflinger Kalke. Beitrage zur Palaontologie und Geologie Osterreich-Ungarns und des Orients, 1896, 10: 1-112.

[2] Arthaber, G., 1906. Die Alpine Trias des Mediterran-Gebietes. Lethaea Geognostica, II, Das Mesozoicum I. 224–391

[3] Assereto R. Die Binodosus-Zone. Ein Jahrhundert Wissenschaftlicher Gegensätze. Sitzungsberichte der Österreichische Akademie der Wissenschaften, 1971, 179: 25-53.

[4] Assereto R. Aegean and Bithynian: Proposal for Two New Anisian Substages. In: Zapfe, H., ed., The Stratigraphy of the Alpine-Mediterranean Triassic, Schriftenreihe der Erdwissenschaftlichen Komission. Österreichische Akadamie der Wissenschaften, 1974, 2: 23-39.

[5] Assereto R, Jacobshagen V, Kauffmann G, . The Scythian/Anisian Boundary in Chios, Greece. Rivista Italiana di Paleontologia e Stratigrafia, 1980, 85: 715-735.

[6] Balini M, Lucas S G, Jenks J F, . Triassic Ammonoid Biostratigraphy: An Overview. Geological Society, London, Special Publications, 2010, 334(1): 221-262.

[7] Bender H. Zur Gliederung der Mediterranen Trias II. Die Conodontenchronologie der Mediterranen Trias. Annales Géologique Pays Hellénique, 1970, 19: 465-540.

[8] Bender H, Stoppel D. Perm-Conodonten. Geologisches Jahrbuch, 1965, 82: 331-364.

[9] Budurov K, Stefanov S. Plattform-Conodonten und ihre Zonen in der Mittleren Trias Bulgariens. Mitteilungen der Gesellschaft der Geologie und Bergbaustudenten in Österreich, 1972, 21: 829-852.

[10] Chen Z-Q, Benton M J. The Timing and Pattern of Biotic Recovery Following the End-Permian Mass Extinction. Nature Geoscience, 2012, 5(6): 375-383.

[11] Chen Y, Jiang H S, Ogg J G, . Early-Middle Triassic Boundary Interval: Integrated Chemo-Bio-Magneto-Stratigraphy of Potential GSSPs for the Base of the Anisian Stage in South China. Earth and Planetary Science Letters, 2020, 530: 115863

[12] Chen Y L, Krystyn L, Orchard M J, . A Review of the Evolution, Biostratigraphy, Provincialism and Diversity of Middle and Early Late Triassic Conodonts. Papers in Palaeontology, 2016, 2(2): 235-263.

[13] Chen Y L, Scholze F, Richoz S, . Middle Triassic Conodont Assemblages from the Germanic Basin: Implications for Multi-Element Taxonomy and Biogeography. Journal of Systematic Palaeontology, 2019, 17(5): 359-377.

[14] Dagys A S. Wiedmann J, Kullmann J. Major Features of the Geographic Differentiation of Triassic Ammonoids. Cephalopods—Present and Past, 1988, Stuttgart: Schweizerbart’sche Verlagsbuchhandlung, 341-349.

[15] Dzik J. Remarks on the Evolution of Ordovician Conodonts. Acta Palaeontologica Polonica, 1976, 21: 395-455.

[16] Farabegoli E, Levanti D, Perri M C, . M. Bivera Formation: An Atypical Middle Triassic “Rosso Ammonitico” Facies from Southern Alps (Italy). Giornale di Geologia, 1984, 46: 33-46.

[17] Gaetani M. Anisian/Ladinian Boundary Field Workshop, Southern Alps-Balaton Highlands. Field-Guide Book, 1993, Milano: I.U.G.S. Subcommission on Triassic Stratigraphy Jun. 27–Jul. 4, 1993

[18] Gaetani M, Jacobshagen V, Nicora A, . The Early-Middle Triassic Boundary at Chios (Greece). Rivista Italiana di Paleontologia e Stratigrafia, 1992, 98: 181-204.

[19] Galfetti T, Bucher H, Brayard A, . Late Early Triassic Climate Change: Insights from Carbonate Carbon Isotopes, Sedimentary Evolution and Ammonoid Paleobiogeography. Palaeogeography, Palaeoclimatology, Palaeoecology, 2007, 243(3): 394-411. 4

[20] Galfetti T, Bucher H, Martini R, . Evolution of Early Triassic Outer Platform Paleoenvironments in the Nanpanjiang Basin (South China) and Their Significance for the Biotic Recovery. Sedimentary Geology, 2008, 204(1): 36-60. 2

[21] Germani D. New Data on Ammonoids and Biostratigraphy of the Classical Spathian Kçira Sections (Lower Triassic, Albania). Rivista Italiana di Paleontologia e Stratigrafia, 1997, 103: 267-292.

[22] Głazek J, Trammer J, Zawidzka K. The Alpine Microfacies with Glomospira densa (Pantiç) in the Muschelkalk of Poland and Some Related Paleogeographical and Geotectonic Problems. Acta Geologica Polonica, 1973, 23: 463-482.

[23] Golding M L. Biostratigraphy and Sedimentology of Triassic Hydrocarbon-Bearing Rocks in Northeastern British Columbia, 2014, Vancouver: University of British Columbia, 402

[24] Golding M L, Orchard M J, Zonneveld J-P, . An Exceptional Record of the Sedimentology and Biostratigraphy of the Montney and Doig Formations in British Columbia. Bulletin of Canadian Petroleum Geology, 2014, 62: 157-176.

[25] Golding M L, Orchard M J, Zonneveld J P, . Determining the Age and Depositional Model of the Doig Phosphate Zone in Northeastern British Columbia Using Conodont Biostratigraphy. Bulletin of Canadian Petroleum Geology, 2015, 63(2): 143-170.

[26] Golding M L, Orchard M J. New Species of the Conodont-Neogondolellafrom the Anisian (Middle Triassic) of Northeastern British Columbia, Canada, and Their Importance for Regional Correlation. Journal of Paleontology, 2016, 90(6): 1197-1211.

[27] Golding M L, Orchard M J. Magnigondolella, a New Conodont Genus from the Triassic of North America. Journal of Paleontology, 2018, 92(2): 207-220.

[28] Goudemand N, Orchard M J, Bucher H, . The Elusive Origin of Chiosella Timorensis (Conodont Triassic). Geobios, 2012, 45(2): 199-207.

[29] Grădinaru, E., 1995. Mesozoic Rocks in North Dobrogea: An Overview. Field Guidebook, Central and North Dobrogea, Romania. IGCP Project No. 369, Comparative Evolution of Peri-Tethyan Rift Basins, October 1–4, 1995. 17–28

[30] Grădinaru, E., 2000. Workshop on the Lower-Middle Triassic (Olenekian-Anisian), June 7–10, 2000, Tulcea, Romania, Conference and Field Trip. Field Trip Guide, Bucharest. 37

[31] Grădinaru E, Gaetani M. Upper Spathian to Bithynian (Lower to Middle Triassic) Brachiopods from North Dobrogea (Romania). Rivista Italiana di Paleontologia e Stratigrafia, 2019, 125: 91-123.

[32] Grădinaru, E., Orchard, M. J., Nicora, A., et al., 2002. Conodont Succession across Olenekian-Anisian Boundary as Deşli Caira, Romania. IUGS Subcommission on Triassic Stratigraphy, STS/IGCP 467 Field Meeting, Veszprém, Hungary. 5–8

[33] Grădinaru E, Kozur H, Nicora A, . The Chiosella timorensis Lineage and Correlation of the Ammonoids and Conodonts around the Base of the Anisian in the GSSP Candidate at Deşli Caira (North Dobrogea, Romania). Albertiana, 2006, 34: 34-39.

[34] Grădinaru E, Orchard M J, Nicora A, . The Global Boundary Stratotype Section and Point (GSSP) for the Base of the Anisian Stage: Deşli Caira, North Dobrogea, Romania. Albertiana, 2007, 36: 54-67.

[35] Henderson C M, Golding M L, Orchard M J. Conodont Sequence Biostratigraphy of the Lower Triassic Montney Formation. Bulletin of Canadian Petroleum Geology, 2018, 66: 7-22.

[36] Henderson, C. M., 2019. A Natural Induan-Olenekian Boundary. 3rd International Congress on Stratigraphy, July 2–5, 2019, Milan. ST9. 1–6

[37] Hirsch F. Embry A F, Beauchamp B, Glass D J. Triassic Conodonts as Ecological and Eustatic Sensors. Memoir of the Canadian Society of Petroleum Geologists, 1994, Pangea: Global Environments and Resources, 949-959. 17

[38] Hounslow M W, Muttoni G. The Geomagnetic Polarity Timescale for the Triassic: Linkage to Stage Boundary Definitions. Geological Society, London, Special Publications, 2010, 334(1): 61-102.

[39] Hounslow M W, Szurlies M, Muttoni G, . The Magnetostratigraphy of the Olenekian-Anisian Boundary and a Proposal to Define the Base of the Anisian Using a Magnetozone Datum. Albertiana, 2007, 36: 62-67.

[40] Jacobshagen V, Gaetani M, Nicora A, . The Early/Middle Triassic Boundary on Chios Island: Preliminary Results of a Reinvestigation. Bulletin of the Geological Society of Greece, 1993, 28: 25-38.

[41] Jeppsson L, Anehus R, Fredholm D. The Optimal Acetate Buffered Acetic Acid Technique for Extracting Phosphatic Fossils. Journal of Paleontology, 1999, 73(5): 964-972.

[42] Kolar-Jurkovšek T. Srednjetriasni Konodonti Slovenije. Rudarsko-Metalurški Zbornik, 1983, 30: 323-364.

[43] Kovács S. Pelsonian Conodonts from the Balaton Highland. Geologica Hungarica, Series Palaeontologica, 2003, 55: 159-177.

[44] Kovács S, Kozur H. Stratigraphische Reichweite der Wichtigsten Conodonten (ohne Zahnreichen Conodonten) der Mittel- und Obertrias. Geologisch-Paläontologische Mitteilungen Innsbruck, 1980, 10: 47-78.

[45] Kovács S, Papšová J. Conodonts from the Paraceratites binodosus Zone (Middle Triassic) from the Mecsek Mts., Southern Hungary and from the Choč Nappe of the Low Tatra Mts., Czechoslovakia. Geologický Zborník—Geologica Carpathica, 1986, 37: 59-74.

[46] Kovács S, Rálisch-Felgenhauer E. Middle Anisian (Pelsonian) Platform Conodonts from the Triassic of the Mecsek Mts (South Hungary)—Their Taxonomy and Stratigraphic Significance. Acta Geologica Hungarica, 2005, 48(1): 69-105.

[47] Kozur H W. Neue Conodonten aus dem Oberen Muschelkalk des Germanischen Binnenbeckens. Monatsberichte der Deutschen Akademie der Wissenschaften zu Berlin, 1968, 10: 130-142.

[48] Kozur H W. Conodonten aus dem Muschelkalk des Germanischen Binnenbeckens und ihr Stratigraphischer Wert. Teil I: Conodonten vom Plattformtyp und Stratigraphische Bedeutung der Conodonten aus dem Oberen Muschelkalk. Geologie, 1968, 17: 930-946.

[49] Kozur H. Die Conodontengattung Metapolygnathus Hayashi 1968 und ihr Stratigraphischer Wert. Geologische-Paläontologische Mitteilungen Innsbruck, 1972, 2: 1-37.

[50] Kozur H W. The Taxonomy of the Gondolellid Conodonts in the Permian and Triassic. Courier Forschungsinstitut Senckenberg, 1989, 117: 409-469.

[51] Lehrmann D J, Wei J Y, Enos P. Controls on Facies Architecture of a Large Triassic Carbonate Platform; the Great Bank of Guizhou, Nanpanjiang Basin, South China. Journal of Sedimentary Research, 1998, 68(2): 311-326.

[52] Lehrmann D J, Enos P, Payne J L, . Permian and Triassic Depositional History of the Yangtze Platform and Great Bank of Guizhou in the Nanpanjiang Basin of Guizhou and Guangxi, South China. Albertiana, 2005, 33: 147-166.

[53] Lehrmann D J, Stepchinski L, Altiner D, . An Integrated Biostratigraphy (Conodonts and Foraminifers) and Chronostratigraphy (Paleomagnetic Reversals, Magnetic Susceptibility, Elemental Chemistry, Carbon Isotopes and Geochronology) for the Permian-Upper Triassic Strata of Guandao Section, Nanpanjiang Basin, South China. Journal of Asian Earth Sciences, 2015, 108: 117-135.

[54] Li M S, Huang C J, Hinnov L, . Astrochronology of the Anisian Stage (Middle Triassic) at the Guandao Reference Section, South China. Earth and Planetary Science Letters, 2018, 482: 591-606.

[55] Liang L, Tong J N, Song H J, . Lower-Middle Triassic Conodont Biostratigraphy of the Mingtang Section, Nanpanjiang Basin, South China. Palaeogeography, Palaeoclimatology, Palaeoecology, 2016, 459: 381-393.

[56] Lindström M. A Suprageneric Taxonomy of the conodonts. Lethaia, 1970, 3: 427-445.

[57] Marquez-Aliaga A, Valenzuela-Rios J I, Calvet F, . Middle Triassic Conodonts from Northeastern Spain: Biostratigraphic Implications. Terra Nova, 2000, 12(2): 77-83.

[58] Matthews S C. Notes on Open Nomenclature and on Synonymy Lists. Palaeontology, 1973, 16: 713-719.

[59] Meço S. Conodont Biostratigraphy of Triassic Pelagic Strata, Albania. Rivista Italiana di Paleontologia e Stratigrafia, 1999, 105: 251-266.

[60] Meço S. Litho-Biostratigraphy and the Conodonts of Palaeozoic/Triassic Deposits in Albania. Palaeontographica Abteilung A, 2010, 290(4): 131-197. 5/6

[61] Mertmann D, Jacobshagen V. Upper Olenekian (Spathian) Ammonoids from Chios (Lower Triassic, Greece): Taxonomy and Stratigraphic Position. Rivista Italiana di Paleontologia e Stratigrafia, 2003, 109: 417-447.

[62] Mirăuţă E. Über die Conodontenfaunen des oberen Werfens und des Tieferen Anis der Nördlichen Dobrudscha/Rumänien. Geologica et Palaeontologica, 1974, 8: 149-158.

[63] Mirăuţă, E., 2000. Conodont Biostratigraphy in the Deşli Caira Section. Workshop on the Lower-Middle Triassic (Olenekian-Anisian), June 7–10, 2000, Tulcea, Romania, Conference and Field Trip. Conference Section, Bucharest. 81–84

[64] Mosher L C. Triassic Conodonts from Western North America and Europe and Their Correlation. Journal of Paleontology, 1968, 42: 895-946.

[65] Mosher L C. Triassic Conodonts from British Columbia and the Northern Arctic Islands. Geological Survey of Canada Bulletin, 1973, 222: 141-193.

[66] Mosher L C, Clark D L. Middle Triassic Conodonts from the Prida Formation of Northwestern Nevada. Journal of Paleontology, 1965, 39: 551-565.

[67] Muto S, Takahashi S, Yamakita S, . High Sediment Input and Possible Oceanic Anoxia in the Pelagic Panthalassa during the Latest Olenekian and Early Anisian: Insights from a New Deep-Sea Section in Ogama, Tochigi, Japan. Palaeogeography, Palaeoclimatology, Palaeoecology, 2018, 490: 687-707.

[68] Muttoni G, Rettori R. New Biostratigraphic Data on the Triassic of Marathovouno Hillock Area (Chios Island, Greece). Rivista Italian di Paleontologia e Stratigrafia, 1994, 99: 461-472.

[69] Muttoni G, Kent D V, Gaetani M. The Base of the Anisian. A Candidate Global Stratotype Section and Point from Chios Island, Greece. Albertiana, 1994, 13: 37-43.

[70] Muttoni G, Kent D V, Gaetani M. Magnetostratigraphy of a Lower-Middle Triassic Boundary Section from Chios (Greece). Physics of the Earth and Planetary Interiors, 1995, 92(3): 245-260. 4

[71] Muttoni G, Kent D V, Meço S, . Magnetobiostratigraphy of the Spathian to Anisian (Lower to Middle Triassic) Kçira Section, Albania. Geophysical Journal International, 1996, 127(2): 503-514.

[72] Muttoni G, Nicora A, Balini M, . A Candidate GSSP for the Base of the Anisian from Kçira, Albania. Albertiana, 2019, 45: 39-49.

[73] Nakrem H A, Orchard M J, Weitschat W, . Triassic Conodonts from Svalbard and Their Boreal Correlations. Polar Research, 2008, 27(3): 523-539.

[74] Narkiewicz K. Conodont Biostratigraphy of the Muschelkalk (Middle Triassic) in the Central Part of the Polish Lowlands. Geological Quarterly, 1999, 43: 313-328.

[75] Nicora A. Conodont-Fauna, Stratigraphic Position and Relations to the Tethyan Succession of the Shoshonensis Zone (Pelsonian) of Nevada. Rivista Italiana di Paleontologia e Stratigrafia, 1976, 82: 627-648.

[76] Nicora A, Kovács S. Conodont Fauna from the Rotelliforme, Meeki and Occidentalis Zones (Middle Triassic) of Humboldt Range, Nevada, Western North America. Rivista Italiana di Paleontologia e Stratigrafia, 1984, 90: 135-164.

[77] Nogami Y. Trias-Conodonten von Timor, Malaysien und Japan. Memoirs of the Faculty of Science, Kyoto University, Series Geology and Mineralogy, 1968, 34: 115-136.

[78] Ogg J G, Huang C, Hinnov L. Triassic Timescale Status: A Brief Overview. Albertiana, 2014, 41: 3-30.

[79] Ogg J G. Publication Announcement: Early-Middle Triassic Boundary Interval: Integrated Chemobio-Magneto-Stratigraphy of Potential GSSPs for the Base of the Anisian Stage in South China. Albertiana, 2019, 45: 70-73.

[80] Orchard M J. Taxonomy and Correlation of Lower Triassic (Spathian) Segminate Conodonts from Oman and Revision of Some Species of Neospathodus. Journal of Paleontology, 1995, 69(1): 110-122.

[81] Orchard M J. Conodont Diversity and Evolution through the Latest Permian and Early Triassic Upheavals. Palaeogeography, Palaeoclimatology, Palaeoecology, 2007, 252(1): 93-117. 2

[82] Orchard M J. Triassic Conodonts and Their Role in Stage Boundary Definition. Geological Society, London, Special Publications, 2010, 334(1): 139-161.

[83] Orchard M J, Rieber H. Multielement Neogondolella (Conodonta, Upper Permian-Middle Triassic). Bolletino della Societa Paleontologia Italiana, 1999, 37: 475-488.

[84] Orchard, M. J., Tozer, E. T., 1997. Triassic Conodont Biochronology, Its Calibration with the Ammonoid Standard, and a Biostratigraphic Summary of the Western Canada Sedimentary Basin. In: Moslow, T. F., Wittenberg, J., eds., Triassic of the Western Canada Sedimentary Basin. Bulletin of Canadian Petroleum Geology, 45: 675–692

[85] Orchard, M. J., Grădinaru, E., Nicora, A., 2007a. A Summary of the Conodont Succession around the Olenekian-Anisian Boundary at Deşli Caira, North Dobrogea, Romania. In: Lucas, S. G., Spielmann, J. A., eds., The Global Triassic. New Mexico Museum of Natural History and Science Bulletin, 41: 341–346

[86] Orchard, M. J., Lehrmann, D. J., Wei, J. Y., et al., 2007b. Conodonts from the Olenekian-Anisian Boundary Beds, Guandao, Guizhou Province, China. In: Lucas, S. G., Spielmann, J. A., eds., The Global Triassic. New Mexico Museum of Natural History and Science Bulletin, 41: 347–354

[87] Ovtcharova M, Bucher H, Schaltegger U, . New Early to Middle Triassic U-Pb Ages from South China: Calibration with Ammonoid Biochronozones and Implications for the Timing of the Triassic Biotic Recovery. Earth and Planetary Science Letters, 2006, 243(3): 463-475. 4

[88] Ovtcharova M, Goudemand N, Hammer Ø, . Developing a Strategy for Accurate Definition of a Geological Boundary through Radio-Isotopic and Biochronological Dating: The Early-Middle Triassic Boundary (South China). Earth-Science Reviews, 2015, 146: 65-76.

[89] Pevný J, Salaj J. The Anisian-Ladinian Boundary at Zakázané (Slovak Karst, Western Carpathians). Zemní Plyn a Nafta, 1997, 42: 97-149.

[90] Pia J. Grundbegriffe der Stratigraphie mit Ausfiihrlicher Anwendung auf die Europaische Mitteltrias, 1930, Leipzig und Wien: Deuticke, 252

[91] Pietsch C, Mosqueda L N. Looking for Signals of Recovery from the End-Permian Mass Extinction through a Transgressive Sequence from the Middle Triassic Anisian of Nevada. Geological Society of America Abstracts with Programs, 2019, 51: 145-149.

[92] Pisa G, Perri C, Veneri P. Upper Anisian Conodonts from Dont and M. Bivera Formations, Southern Alps (Italy). Rivista Italiana di Paleontologia e Stratigrafia, 1980, 85: 807-828.

[93] Rafek M B. Platform Conodonts from the Middle Triassic Upper Muschelkalk of West Germany and N.E. France, 1977, Bonn: University of Bonn, 86

[94] Song H J, Wignall P B, Tong J N, . Integrated Sr Isotope Variations and Global Environmental Changes through the Late Permian to Early Late Triassic. Earth and Planetary Science Letters, 2015, 424: 140-147.

[95] Stone, J., 1987. Review of Investigative Techniques Used in the Study of Conodonts. In: Austin, R. L., ed., Conodonts: Investigative Techniques and Applications. British Micropalaeontological Society Series, Ellis Horwood Ltd. 17–34

[96] Sudar M N. Conodonts from Bulog Limestones of the Inner Dinarides in Yugoslavia and Their Biostratigraphic Importance. Annales Géologiques de la Péninsule Balkanique, 1982, 46: 263-282.

[97] Sudar M N. Triassic Microfossils and Biostratigraphy of the Inner Dinarides in Yugoslavia and Their Biostratigraphic Importance. Annales Géologiques de la Péninsule Balkanique, 1986, 50: 150-394.

[98] Summesberger H, Wagner L. Der Stratotypus des Anis (Trias). Annalen des Naturhistorischen Museums in Wien, 1972, 1972: 515-538.

[99] Sun Z Y, Sun Y L, Hao W C, . Conodont Evidence for the Age of the Panxian Fauna, Guizhou, China. Acta Geologica Sinica—English Edition, 2006, 80(5): 621-630

[100] Sun Y D, Joachimski M M, Wignall P B, . Lethally Hot Temperatures during the Early Triassic Greenhouse. Science, 2012, 338: 366-370.

[101] Szabó I, Kovács S, Lelkes G Y, . Stratigraphic Investigation of a Pelsonian-Fassanian Section at Felsõörs (Balaton Highland, Hungary). Rivista Italiana di Paleontologia e Stratigrafia, 1980, 85: 789-806.

[102] Tatge U. Conodonten aus dem Germanischen Muschelkalk. Paläontologische Zeitschrift, 1956, 30: 108-127.

[103] Tong J N, Chu D L, Liang L, . Triassic Integrative Stratigraphy and Timescale of China. Science China Earth Sciences, 2019, 62(1): 189-222.

[104] Tozer, E. T., Calon, T. J., 1990. Triassic Ammonoids from Jabal Safra and Wadi Alwa, Oman, and Their Significance. In: Robertson, A. H. F., Searle, M. P., Ries, A. C., eds., The Geology and Tectonics of the Oman Region. Geological Society of London Special Publication, 49: 203–211

[105] Trammer J. Middle Triassic (Muschelkalk) Conodonts from the SW Margin of the Holy Cross Mts. Acta Geologica Polonica, 1971, 21: 379-386.

[106] Trammer J. Stratigraphy and Facies Development of the Muschelkalk in the South-Western Holy Cross Mts. Acta Geologica Polonica, 1975, 25: 179-216.

[107] Waagen, W., Diener, C., 1895. Untere Trias. In: Mojsisovics, E., von Waagen, W., Diener, C., eds., Entwurf einer Gliederung der Pelagischen Sedimente des Trias-Systems. Sitzungsberichte Akademie Wissenschaft Wien, Mathematische—Naturwissenschaftliche Klasse, 104: 1271–1302

[108] Wang C, Wang Z. Xizang Scientific Expedition Work-team of Chinese Academy of Sciences Triassic Conodonts in the Mount Jolmo Lungma Region. A Report of Scientific Expedition in the Mount Jolmo Lungma Region 1966–1968 (Paleontology), 1976, Beijing: Science Press, 387-424. (in Chinese)

[109] Wang H, Wang X, Li R, . Triassic Conodont Succession and Stage Subdivision of the Guandao Section, Bianyang Luodian. Acta Palaentologica Sinica, 2005, 44: 611-626.

[110] Wignall P B. The Worst of Times: How Life on Earth Survived Eighty Million Years of Extinctions, 2015, Princeton: Princeton University Press

[111] Yan C B, Jiang H S, Lai X L, . The Relationship between the “Green-Bean Rock” Layers and Conodont Chiosella Timorensis and Implications on Defining the Early-Middle Triassic Boundary in the Nanpanjiang Basin, South China. Journal of Earth Science, 2015, 26(2): 236-245.

[112] Zakharov Y D, Popov A M, Buryi G I. Unique Marine Olenekian-Anisian Boundary Section from South Primorye, Russian Far East. Journal of China University of Geosciences, 2005, 16: 219-230.

[113] Zawidzka K. Conodont Stratigraphy and Sedimentary Environment of the Muschelkalk in Upper Silesia. Acta Geologica Polonica, 1975, 25: 217-245.