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Gateway to the Paleobiology Database
Lake Basin, Big Lake (PU) (Cretaceous of the United States)

Where: Stillwater County, Montana (45.8° N, 109.1° W: paleocoordinates 52.9° N, 76.3° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Bearpaw Shale Formation (Montana Group), Late/Upper Campanian (84.9 - 70.6 Ma)

• from "lower part of Bearpaw Shale"; originally considered "Ft. Pierre Shale"

• member-level stratigraphic resolution

Environment/lithology: marine; shale and gray limestone

• "Dark, soft shales predominate. There are occasional thin bands of sand and many brownish concretions which break into angular fragments. These sometimes contain marine fossils and sometimes a network of calcite seams...Some hard limestone concretions are crowded with these."

Size classes: macrofossils, mesofossils

Collected by E. Douglass in 1901; reposited in the YPM

Collection methods: quarrying, mechanical,

Primary reference: E. Douglass. 1902. Dinosaurs in the Fort Pierre Shales and underlying beds in Montana. Science 15(366):31-32 [M. Carrano/M. Carrano/M. Carrano] more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 26767: authorized by Matthew Carrano, entered by Matthew Carrano on 30.10.2002, edited by Jonathan Tennant

Creative Commons license: CC BY (attribution)