Where: Contra Costa County, California (38.0° N, 122.1° W: paleocoordinates 43.2° N, 101.2° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Martinez Formation, Thanetian (59.2 - 56.0 Ma)

• Most of the fossiliferous faunas in the sections near Martinez occur in the lower 800 ft thick sandstone unit. Mollusca suggest a "Martinez" stage age. Martinez local stage = Thanetian. The Martinez Formation rests with a slight unconformity on the Chico Formation and grades in Eocene shales. The formation is approximately 3100 ft thick with a 1500 ft lower sandstone unit and 1600 ft upper sandy shale, which is dated as Early Eocene.

• bed-level stratigraphic resolution

Environment/lithology: offshore; poorly lithified, medium-grained, coarse, glauconitic sandstone

Size class: macrofossils

Collection methods: quarrying,

• Collected and identified by C.E. Weaver. Collections reposited in University of Washington collections.

Primary reference: C. E. Weaver. 1949. Geology of the coast ranges immediately north of the San Francisco Bay region, California. Geological Society of America Memoir 35 [A. Miller/A. Hendy/A. Hendy]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 52615: authorized by Austin Hendy, entered by Austin Hendy on 11.08.2005

Creative Commons license: CC BY (attribution)