North of Bird Rock (Needles) (Cretaceous of the United States)

Where: Marin County, California (37.8° N, 122.5° W: paleocoordinates 37.8° N, 82.7° W)

• coordinate estimated from map

• outcrop-level geographic resolution

When: Cenomanian (100.5 - 93.9 Ma)

• bed-level stratigraphic resolution

Environment/lithology: submarine fan; lithified, fine-grained sandstone

Size class: macrofossils

Preservation: mold/impression

Collected by G.J. Keasling in 1945; reposited in the CAS

Primary reference: L. G. Hertlein. 1956. Cretaceous ammonite of Franciscan Group, Marin County, California. Bulletin of the American Association of Petroleum Geologists 40:1985-1988 [M. Clapham/M. Clapham/M. Clapham]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 185241: authorized by Matthew Clapham, entered by Matthew Clapham on 17.04.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

 Ammonitida - Acanthoceratidae
Mantelliceras sp. Hyatt 1903 ammonite