USGS locality 331 near Sedalia, CO Dawson arkose (Paleocene of the United States)

Also known as USGS locality 331

Where: Colorado (39.4° N, 103.0° W: paleocoordinates 44.8° N, 82.7° W)

• coordinate based on political unit

When: Dawson arkose Formation, Paleocene (66.0 - 56.0 Ma)

• Denver Basin

• formation-level stratigraphic resolution

Environment/lithology: fluvial; shale and sandy claystone

• 'Dawson arkose: arenaceous clays, shales, coals, rhyolite flows'

Reposited in the USNM

Collection methods: quarrying, mechanical,

• Specimens were collected by A. Lakes, and given to S. F. Emmons, USGS, who gave them to Brown.

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 40057: authorized by Peter Wilf, entered by Jocelyn Sessa on 16.06.2004

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
 Vitales - Vitaceae
Vitis olriki, Cissus marginata
Vitis olriki Heer 1868 grapevine
Cissus marginata Lesquereux 1872