USGS Mesozoic 18758, Suction Creek (Jurassic of the United States)

Where: Blaine County, Montana (48.2° N, 109.1° W: paleocoordinates 41.7° N, 50.3° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Kepplerites mclearni ammonoid zone, Rierdon Formation (Ellis Group), Early/Lower Callovian (164.7 - 161.2 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified lithology not reported

Size class: macrofossils

Preservation: mold/impression

Reposited in the USNM

Primary reference: B. Kummel. 1954. Jurassic nautiloids from western North America. Journal of Paleontology 28:320-324 [M. Clapham/M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 180714: authorized by Matthew Clapham, entered by Matthew Clapham on 29.07.2016

Creative Commons license: CC BY (attribution)

Taxonomic list

 Nautilida - Nautilidae
Eutrephoceras montanensis Kummel 1954 nautiloid