Also known as Theodore Roosevelt National Park, South Unit, near Medora, Billings County North Dakota (Sentinel Butte Formation)

Where: Billings County, North Dakota (46.9° N, 103.5° W: paleocoordinates 51.6° N, 83.0° W)

• coordinate based on nearby landmark

When: Sentinel Butte Formation, Late/Upper Paleocene (58.7 - 55.8 Ma)

• Disconformably overlying the Sentinel Butte Shale is the Golden Valley Formation, of Eocene age. This occurs on the tops of buttes, particularly near the towns of Hebron, South Heart, and Grassy Butte, North Dakota.

• formation-level stratigraphic resolution

Environment/lithology: shale

Size class: microfossils

Preservation: original sporopollenin

Collection methods: surface (in situ), chemical,

Primary reference: R. K. Jain and J. W. Hall. 1969. A contribution to the Early Tertiary fossil record of the Salviniaceae. American Journal of Botany 56(5):527-539 [R. Lupia/T. Naeher/T. Naeher]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 34107: authorized by Rick Lupia, entered by Tiffany Naeher on 18.08.2003

Creative Commons license: CC BY (attribution)