USGS locality 8238, near the top of Sentinel Butte, Fort Union (Paleocene of the United States)

Where: North Dakota (46.9° N, 103.8° W: paleocoordinates 52.2° N, 81.0° W)

• coordinate based on political unit

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

Environment/lithology: fluvial; argillaceous sandstone

• in clinkered lower portion of massive sandstone

Reposited in the USNM

Collection methods: quarrying, mechanical,

• Specimens were collected by R. W. Brown, T. W. Stanton, J. Murata on July 29, 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 58084: 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.
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 Coniferales - Cupressaceae
Metasequoia occidentalis
Metasequoia occidentalis Chaney 1951 dawn redwood
cones