UCMP B7266 (Pliocene of the United States)

Where: Contra Costa County, California (37.9° N, 122.2° W: paleocoordinates 37.6° N, 121.0° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Siesta Formation, Pliocene (5.3 - 2.6 Ma)

Environment/lithology: lacustrine; limestone

• cyclic lacustrine sedimentation in a low energy environment
• gray to white limestone bed approximately 10 feet thick, striking N 60 degrees W

Size class: macrofossils

Primary reference: J. R. Firby. 1967. Pliocene non-marine mollusks from Contra Costa County, California. Proceedings of the California Academy of Sciences 34(14):511-524 [P. Holroyd/P. Holroyd]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 217347: authorized by Patricia Holroyd, entered by Patricia Holroyd on 09.02.2021

Creative Commons license: CC BY (attribution)

Taxonomic list

Gastropoda
 Heterostropha - Lymnaeidae
Bivalvia
 Cardiida - Sphaeriidae
Sphaerium cynodon fingernail clam