Where: Montana (44.7° N, 112.8° W: paleocoordinates 14.3° N, 35.0° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Thaynes Formation, Smithian (251.3 - 247.2 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified lithology not reported

Size class: macrofossils

Primary reference: B. Kummel. 1953. American Triassic coiled nautiloids. United States Geological Survey Professional Paper 250:1-104 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 110957: authorized by Matthew Clapham, entered by Matthew Clapham on 16.06.2011

Creative Commons license: CC BY (attribution)