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 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 42279: authorized by David Bottjer, entered by Nicole Bonuso on 27.07.2004