Trigonia americana ASSEMBLAGE (Jurassic of the United States)

Where: Wyoming (44.0° N, 108.0° W: paleocoordinates 35.5° N, 48.3° W)

• coordinate estimated from map

• local area-level geographic resolution

When: Gypsum Spring Formation, Bajocian (170.3 - 168.3 Ma)

• member-level stratigraphic resolution

Environment/lithology: open shallow subtidal; lime mudstone

• clay and lime mud, pelleted, oolitic in places

Size class: macrofossils

Preservation: trace, original calcite

Collection methods: mechanical

Primary reference: R. P. Wright. 1974. Jurassic Bivalves from Wyoming and South Dakota: A study of feeding relationsips. Journal of Paleontology 48(3):425-433 [M. Aberhan/S. Nurnberg/S. Nurnberg]more details

Purpose of describing collection: paleoecologic analysis

PaleoDB collection 36529: authorized by Martin Aberhan, entered by Sabine Nürnberg on 03.02.2004

Creative Commons license: CC BY (attribution)

Taxonomic list

 Mytilida - Mytilidae
 Carditida - Astartidae
Astarte meeki Stanton 1899 clam
 Pholadida - Corbulidae
Corbula sp. Bruguière 1789 clam
 Cardiida - Arcticidae
Pronoella cinnabarensis Stanton 1899 clam
 Trigoniida - Trigoniidae