Where: Contra Costa County, California (38.0° N, 122.1° W: paleocoordinates 44.0° N, 98.0° W)

• coordinate based on nearby landmark

When: Late/Upper Maastrichtian (70.6 - 66.0 Ma)

• Great Valley Series. Late Maastrichtian.

Environment/lithology: marine; lithology not reported

Size class: macrofossils

Collected by J.C. Merriam; reposited in the UCMP

Primary reference: L. R. Saul and W. P. Popenoe. 1992. Pacific Slope Cretaceous bivalves of the genus Calva. Contributions in Science, Los Angeles County Museum 433:1-68 [J. Marcot/J. Marcot]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 219052: authorized by Jonathan Marcot, entered by Jonathan Marcot on 15.03.2021

Creative Commons license: CC BY (attribution)