Where: Shasta County, California (40.9° N, 122.1° W: paleocoordinates 13.5° N, 53.5° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Hosselkus Formation, Tuvalian (232.0 - 221.5 Ma)

• Zone of Tropites subbullatus; Trachyceras subzone according to Smith, 1927

• group of beds-level stratigraphic resolution

Environment/lithology: lithified limestone

Size class: macrofossils

Reposited in the USNM

Primary reference: J. P. Smith. 1927. Upper Triassic marine invertebrate faunas of North America. United States Geological Survey Professional Paper 141:1-262 [D. Bottjer/C. Powers/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 144077: authorized by Matthew Clapham, entered by Matthew Clapham on 30.04.2013

Creative Commons license: CC BY (attribution)