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MPM locality 3850 (Hell Creek Formation) (Cretaceous of the United States)

Where: McCone County, Montana (47.7° N, 106.2° W: paleocoordinates 54.5° N, 78.6° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Hell Creek Formation, Maastrichtian (70.6 - 66.0 Ma)

• Middle Hell Creek. Approx. 100 feet above Fox Hills Sandstone/Hell Creek Fm contact, somewhat beneath the middle of the 250-280 feet of Hell Creek Fm east of the Fort Peck Reservoir.

• bed-level stratigraphic resolution

Environment/lithology: "channel"; green, yellow sandstone and green, yellow siltstone

• "flat bedding and silty to sandy grain size..suggest sediments deposited lateral to a fluvial channel."
• green to buff fine-grained sandstone and siltstone

Size class: macrofossils

Collection methods: surface (float),

Primary reference: E. B. Giffin, D. L. Gabriel, and R. E. Johnson. 1988. A new pachycephalosaurid skull (Ornithischia) from the Cretaceous Hell Creek Formation of Montana. Journal of Vertebrate Paleontology 7(4):398-407 [J. Alroy/R. Whatley/J. Alroy] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 12977: authorized by John Alroy, entered by Robin Whatley on 12.01.2002

Creative Commons license: CC BY (attribution)