Where: Amador County, California (38.5° N, 120.9° W: paleocoordinates 32.9° N, 66.1° W)

• coordinate estimated from map

When: Logtown Ridge Formation, Callovian to Callovian (166.1 - 150.8 Ma)

Environment/lithology: marine; metamorphosed tuff

Size class: macrofossils

Collected by F. M. N. Hamilton in 1914

Primary reference: R. W. Imlay. 1961. Late Jurassic ammonites from the western Sierra Nevada, California. United States Geological Survey Professional Paper 374-D:D-1-D-28 [J. Marcot/J. Marcot]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 192820: authorized by Jonathan Marcot, entered by Jonathan Marcot on 19.04.2018

Creative Commons license: CC BY (attribution)