Where: Contra Costa County, California (38.0° N, 122.1° W: paleocoordinates 41.9° N, 103.6° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Capay Shale Member (Martinez Formation), Ypresian (56.0 - 47.8 Ma)

• From upper shale unit. Foraminifera suggest a "Capay" stage age. Capay local stage = Ypresian. 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; lithified, medium-grained, coarse, glauconitic, sandy shale

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 52621: authorized by Austin Hendy, entered by Austin Hendy on 11.08.2005

Creative Commons license: CC BY (attribution)