Where: Bear Lake County, Idaho (42.0° N, 111.0° W: paleocoordinates 11.7° N, 35.0° W)

• coordinate based on nearby landmark

When: Early/Lower Triassic (252.2 - 247.2 Ma)

• The Tirolites zone lies about 225 feet above the Meekoceras zone and about 30 feet below the Columbites zone.

• bed-level stratigraphic resolution

Environment/lithology: marine; gray shale

Primary reference: J. P. Smith. 1932. Lower Triassic ammonoids of North America. United States Geological Survey Professional Paper 167 [D. Bottjer/C. Powers/C. Jamet]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 33317: authorized by David Bottjer, entered by Catherine Powers on 25.07.2003, edited by Austin Hendy

Creative Commons license: CC BY (attribution)