PBDB Collection

Leidapo ML-17-18 (Triassic of China)

Where: Guizhou, China (26.9° N, 108.7° E: paleocoordinates 17.3° N, 96.3° E)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Leidapo Member (Qingyan Formation), Middle Triassic (247.2 - 237.0 Ma)

• The Qingyan Formation is composed of limestones and mudstones and is about 800m thick. In ascending order, it is subdivided into the Xiaoshan, Mafengpo, Yingshangpo, Leidapo, and Yuqing members. According to palaeontological data, the latter two members are assigned to the upper Anisian, whereas the other three are regarded as lower Anisian in age.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; mudstone

• The Leidpo Member discussed in this paper, occupying the lower part of the upper Anisian, is about 200m thick and consists of mudstones, shales and marls. this member is characterized by fossiliferous mudstones and marls. It is grouped into three parts. The lower and upper parts are mainly composed of massive. laminated mudstone with abundant "paper shelled bivalves". The middle part consists of alternating beds of mudstone and marl.

•

•The Qingyan Formation is present in the northern part of the Middle Triassic Nanpanjiang Basin (or the Dian-Qian-Gui Basin), which was filled mainly with carbonate platform, bank and siliciclastic basinal deposits. the shallow-water carbonate platform is called the Yangtze Platform and was a stable palaeogeographic element from the Late Proterozoic to the Triassic.

Size class: macrofossils

Primary reference: T. Komatsu, J. Chen, M. Cao, F. Stiller, and H. Naruse. 2004. Middle Triassic (Anisian) diversified bivavles: depositional environments and bivalve assemblages in the Leidapo Member of the Qingyan Formation, southern China. Palaeogeography, Palaeoclimatology, Palaeoecology 208:207-223 [D. Bottjer/N. Bonuso/N. Bonuso]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 42278: authorized by David Bottjer, entered by Nicole Bonuso on 27.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

Bivalvia
Pterioida - Prospondylidea	"Enantiostreon difformis" = Terquemia difformis "Enantiostreon difformis" = Terquemia difformis Schlotheim 1820 clam
Cyrtodontida - Pichleriidae	Elegantarca subareata Elegantarca subareata Chen 1976 clam
Arcida - Parallelodontidae	Parallelodon esiensis Parallelodon esiensis clam
Pectinida - Hunanopectinidae	Leptochondria paradoxica, Leptochondria subillyrica Leptochondria paradoxica scallop Leptochondria subillyrica scallop
Pectinida - Pectinoidae	Praechlamys schroeteri, Pleuronectites cf. laevigatus Praechlamys schroeteri scallop Pleuronectites cf. laevigatus Schlotheim 1820 scallop
Pectinida - Dimyidae	Protostrea sinensis Protostrea sinensis Hsu 1943 scallop
Pectinida - Entoliidae	Entolium sp. Entolium sp. Meek 1865 scallop
Ostreida - Pteriidae	Pteria rugosa, Pteria cf. sturi Pteria rugosa Chen 1976 pearl oyster Pteria cf. sturi Bittner 1895 pearl oyster
Ostreida - Bakevelliidae	Cultriopsis angusta, Gervillaria subelegans Cultriopsis angusta Munster 1838 oyster Gervillaria subelegans Chen 1976 oyster
Ostreida - Cassianellidae	Cassianella sulcata, Cassianella qingyanensis, Cassianella gyrphaeatoides, Cassianella simplex Cassianella sulcata oyster Cassianella ecki sulcata Cassianella qingyanensis oyster Cassianella gyrphaeatoides oyster Cassianella simplex Chen 1976 oyster
Myalinida - Mysidiellidae	"Mytilus praecursor" = Promysidiella eduliformis praecursor "Mytilus praecursor" = Promysidiella eduliformis praecursor Renz 1904 clam Mytilus eduliformis praecursor
Mytilida - Mytilidae	Modiolus paronai, Modiolus dimidiatus Modiolus paronai Bittner 1895 mussel Modiolus dimidiatus Münster 1841 mussel
Trigoniida - Myophoriidae	Costatoria multiformis, Costatoria inaequicostata, "Quadratia quadrata" = Guizhoumyophoria quadrata, Neoschizodus cf. laevigatus, Elegantinia kunlunensis, Elegantinia elegans, Elegantinia cf. venusta Costatoria multiformis clam Costatoria prohara multiformis Costatoria inaequicostata Klipstein 1843 clam "Quadratia quadrata" = Guizhoumyophoria quadrata Yin 1974 clam Neoschizodus cf. laevigatus Ziethen 1830 clam Elegantinia kunlunensis clam Elegantinia elegans Dunker 1849 clam Elegantinia cf. venusta Chen 1976 clam
Lucinida - Lucinidae	Schafhaeutlia astarteformis, Schafhaeutlia laubei, Schafhaeutlia mellingi Schafhaeutlia astarteformis clam Schafhaeutlia laubei Bittner 1895 clam Schafhaeutlia mellingi Hauer 1857 clam
Carditida - Myophoricardiidae	Myophoricardium lineatum Myophoricardium lineatum von Wöhrmann 1889 clam
Nuculida - Nuculidae	Palaeonucula qingyanensis Palaeonucula qingyanensis Chen 1976 nut clam