Where: Montana (48.1° N, 106.3° W: paleocoordinates 54.4° N, 72.0° W)
• coordinate based on nearby landmark
• outcrop-level geographic resolution
When: Bearpaw Formation, Late/Upper Campanian (83.5 - 70.6 Ma)
• Unit 4, lower part
• group of beds-level stratigraphic resolution
Environment/lithology: offshore; poorly lithified shale
Size class: macrofossils
Reposited in the USNM
Primary reference: F. S. Jensen and H. D. Varnes. 1964. Geology of the Fort Peck area, Garfield, McCone and Valley counties, Montana. United States Geological Survey Professional Paper 414-F:1-49 [M. Clapham/M. Clapham]more details
Purpose of describing collection: taxonomic analysis
PaleoDB collection 213085: authorized by Matthew Clapham, entered by Matthew Clapham on 25.08.2020
Creative Commons license: CC BY (attribution)
Taxonomic list
Cephalopoda | |
Baculites compressus Say 1920 ammonite |