PBDB Collection

Leidapo ML-29 (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 42368: authorized by David Bottjer, entered by Nicole Bonuso on 28.07.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Show authors, comments, and common names

Bivalvia
Lucinida - Lucinidae	Schafhaeutlia laubei, Schafhaeutlia mellingi Schafhaeutlia laubei Bittner 1895 clam Schafhaeutlia mellingi Hauer 1857 clam
Trigoniida - Myophoriidae	Elegantinia kunlunensis, Elegantinia elegans, Elegantinia cf. venusta, "Quadratia quadrata" = Guizhoumyophoria quadrata Elegantinia kunlunensis clam Elegantinia elegans Dunker 1849 clam Elegantinia cf. venusta Chen 1976 clam "Quadratia quadrata" = Guizhoumyophoria quadrata Yin 1974 clam
Ostreida - Posidoniidae	Posidonia sp. Posidonia sp. Bronn 1828 oyster
Ostreida - Cassianellidae	Cassianella sulcata, Cassianella qingyanensis, Cassianella subsislonensis, Cassianella gryphaeatoides, Cassianella simplex Cassianella sulcata oyster Cassianella ecki sulcata Cassianella qingyanensis oyster Cassianella subsislonensis oyster Cassianella gryphaeatoides oyster Cassianella simplex Chen 1976 oyster
Ostreida - Pteriidae	Pteria rugosa, Pteria guizhouensis, Pteria cf. sturi Pteria rugosa Chen 1976 pearl oyster Pteria guizhouensis Chen 1976 pearl oyster Pteria cf. sturi Bittner 1895 pearl oyster
Pectinida - Dimyidae	Protostrea sinensis Protostrea sinensis Hsu 1943 scallop
Pectinida - Hunanopectinidae	Leptochondria subillyrica, Leptochondria albertii Leptochondria subillyrica scallop Leptochondria albertii Goldfuss 1838 scallop
Pectinida - Limidae	Mysidioptera aff. vixcostata, Plagiostoma tingi Mysidioptera aff. vixcostata Stoppani 1860 file clam Plagiostoma tingi file clam
Pectinida - Pectinoidae	Praechlamys badiotica Praechlamys badiotica scallop
Pterioida - Prospondylidea	"Enantiostreon difformis" = Terquemia difformis "Enantiostreon difformis" = Terquemia difformis Schlotheim 1820 clam
Mytilida - Mytilidae	Modiolus paronai Modiolus paronai Bittner 1895 mussel