Leidapo ML-26 (Triassic of China)

Where: Guizhou, China (26.9° N, 108.7° E: paleocoordinates 14.8° N, 96.3° E)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Leidapo Member (Qingyan Formation), Anisian (247.2 - 242.0 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 42284: 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
 Pectinida - Dimyidae
Protostrea sinensis
Protostrea sinensis Hsu 1943 scallop
 Ostreida - Pteriidae
Pteria rugosa, Pteria guizhouensis
Pteria rugosa Chen 1976 pearl oyster
Pteria guizhouensis Chen 1976 pearl oyster
 Ostreida - Cassianellidae
Cassianella sulcata, Cassianella qingyanensis, Cassianella subsislonensis, Cassianella simplex
Cassianella sulcata oyster
Cassianella ecki sulcata
Cassianella simplex Chen 1976 oyster
 Cyrtodontida - Pichleriidae
Elegantarca subareata
Elegantarca subareata Chen 1976 clam
 Trigoniida - Myophoriidae
Elegantinia cf. venusta, Elegantinia elegans, "Quadratia quadrata" = Guizhoumyophoria quadrata
Elegantinia elegans Dunker 1849 clam
"Quadratia quadrata" = Guizhoumyophoria quadrata Yin 1974 clam
 Nuculida - Nuculidae
Palaeonucula strigilata
Palaeonucula strigilata Goldfuss 1837 nut clam