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

Where: Qinghai, China (33.3° N, 91.3° E: paleocoordinates 23.9° N, 88.5° E)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Suwa Formation (Tanggula Group), Oxfordian (163.5 - 157.3 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 limestone and lithified, silty sandstone

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

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 37890: authorized by Martin Aberhan, entered by Sabine Nürnberg on 27.03.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Pectinida - Pectinoidae
 Mytilida - Mytilidae
Modiolus (Modiolus) imbricatus Sowerby 1818 mussel
 Pholadida - Pleuromyidae
Pleuromya calceiformis Phillips 1875 clam