USGS locality 8222, At first of Blue Buttes, south of Keene, Fort Union Fm (Paleocene of the United States)

Where: Powell County, North Dakota (46.6° N, 112.5° W: paleocoordinates 53.3° N, 90.7° W)

• coordinate based on political unit

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

Environment/lithology: fluvial; shale

• clinker

Reposited in the USNM

Collection methods: quarrying, mechanical,

• Specimens were collected by R. W. Brown, J. Murata on June 25, 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 58036: authorized by Peter Wilf, entered by Jocelyn Sessa on 16.01.2006

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.
Angiospermae
 Fagales - Juglandaceae
"Carya antiquorum" = Hicoria antiquora
"Carya antiquorum" = Hicoria antiquora Newberry 1868
 Rosales - Ulmaceae
Celtis aspera Manchester 2014 hackberry
 Coniferales - Cupressaceae
Thuja interrupta Newberry 1868 cypress
Polypodiopsida
 Polypodiales - Polypodiidae
Dennstaedtia americana Knowlton 1910