USGS localities 8231, 8232, and 8233, west of Grassy Butte, Fort Union (Paleocene of the United States)

Also known as USGS locality 8231, 8232, and 8233

Where: North Dakota (47.4° N, 103.3° W: paleocoordinates 52.6° N, 80.2° W)

• coordinate based on political unit

When: Fort Union Formation, Paleocene (66.0 - 56.0 Ma)

• In sandstone at base of butte (for collection 8231)

Environment/lithology: fluvial; sandstone and claystone

• In sandstone at base of butte - 8231; 8232 clay - Brown combined these collections

Reposited in the USNM

Collection methods: quarrying, mechanical,

• Specimens were collected by R. W. Brown July 28, 1931

Primary reference: R. W. Brown. 1962. Paleocene flora of the Rocky Mountains and Great Plains. United States Geological Survey Professional Paper 375:1-119 [P. Wilf/J. Sessa/M. Uhen]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 58082: authorized by Peter Wilf, entered by Jocelyn Sessa on 17.01.2006

Creative Commons license: CC BY (attribution)

Taxonomic list

• Species lists for Brown 1962 were compiled from the publication and provided for the Paleobiology Database by Drs. Steven R. Manchester and Peter R. Crane.
Show authors, comments, and common names
Angiospermae
 Fagales - Betulaceae
Corylus insignis
Corylus insignis Heer 1871 hazel
Polypodiopsida
 Polypodiales - Polypodiidae
Dennstaedtia americana
Dennstaedtia americana Knowlton 1910