USGS locality 8899, Gwynn's Ranch on Grass Creek, below basal Fort Union (Paleocene of the United States)

Where: Wyoming (43.9° N, 108.7° W: paleocoordinates 50.1° N, 87.4° W)

• coordinate based on political unit

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

• Below the basal Fort Union sandstone and conglomerate

Environment/lithology: fluvial; siliciclastic sediments

Reposited in the USNM

Collection methods: quarrying, mechanical,

• Specimens were collected by R.W. Brown on July 5, 1940

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 57993: authorized by Peter Wilf, entered by Jocelyn Sessa on 14.01.2006

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
 Coniferales - Cupressaceae
Taxodium olriki, Metasequoia occidentalis
Metasequoia occidentalis Chaney 1951 dawn redwood
Angiospermae
 Saxifragales - Cercidiphyllaceae
Cercidiphyllum arcticum
 Nymphaeales - Nymphaeaceae
Paranymphaea crassifolia
Paranymphaea crassifolia Newberry 1935 water lily
Dicotyledoneae
 Myrtales - Myrtaceae
Myrtophyllum torreyi
Myrtophyllum torreyi Dorf 1942 myrtle
Angiospermae
 Vitales - Vitaceae
Vitis olriki, Ampelopsis acerifolia
Vitis olriki Heer 1868 grapevine
Ampelopsis acerifolia Newberry 1868
Polypodiopsida
 Polypodiales - Polypodiidae
Dryopteris lakesi
Gastropoda
 Sorbeoconcha - Ficidae
Ficus affinis
Ficus affinis fig shell