Tanggula Mountains, Yanshiping Section, Quemuoco Formation (Jurassic of China)

Where: Qinghai, China (33.3° N, 92.0° E: paleocoordinates 25.8° N, 89.4° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Quemuoco Formation (Yanshiping Group), Bajocian (170.3 - 168.3 Ma)

• GENERAL COMMENT: bivalves are not evenly distributed throughout the sequence, but are concentrated at certain horizons, large parts of the sedimentary sequence in between being unfossiliferous.

• formation-level stratigraphic resolution

Environment/lithology: marginal marine; lithified siliciclastic sediments

• The province represents extensive marginal marine environments ranging from nearshore shelf to restricted embayments, lagoons and freshwater lakes.
• The Quemuoco Fm at Yanshiping is mainly composed of fine grained and silty sandstones and argillites.

Size class: macrofossils

Collection methods: chemical, mechanical,

• focus on bivalves

Primary reference: J. Yin and F. T. Fürsich. 1991. Middle and Upper Jurassic bivalves from the Tanggula Mountains, W-China. Beringeria, Würzburger geowissenschaftliche Mitteilungen 4:127-192 [M. Aberhan/S. Nurnberg/P. Wagner]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 37885: authorized by Martin Aberhan, entered by Sabine Nürnberg on 27.03.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Pectinida - Pectinoidae
Camptonectes (Camptonectes) auritus Schlotheim 1813 scallop
 Ostreida - Bakevelliidae
 Cardiida - Cardiidae
 Unionida - Unionidae
"Cuneopsis" johannisboehmi freshwater mussel
"Cuneopsis" tanggulaensis n. sp. freshwater mussel
"Potomida" ovalis freshwater mussel
"Potomida" chaoi freshwater mussel
"Potomida" thailandica freshwater mussel
Demospongea
 Tabulospongida - Parastromatoporidae