Where: Plumas County, California (40.1° N, 120.7° W: paleocoordinates 19.6° N, 56.9° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Brock Shale Formation, Sevatian (212.0 - 205.6 Ma)

• Probably Sevatian based on co-occurrence of Rhabdoceras suessi and Monotis, but possibly Alaunian.

• group of beds-level stratigraphic resolution

Environment/lithology: lithified limestone

Size class: macrofossils

Collected by J.S. Diller, A. Hyatt in 1891; reposited in the USNM

Primary reference: A. Hyatt and J. P. Smith. 1905. The Triassic cephalopod genera of America. United States Geological Survey Professional Paper 40:1-394 [D. Bottjer/C. Powers/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 142618: authorized by Matthew Clapham, entered by Matthew Clapham on 14.04.2013

Creative Commons license: CC BY (attribution)