Also known as USGS D43(SD)

Where: Broadwater County, Montana (46.0° N, 111.5° W: paleocoordinates 14.2° S, 46.3° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Three Forks Shale Formation, Famennian (372.2 - 358.9 Ma)

• 27 feet below Lodgepole Limestone, 13 feet above base of upper siltstone unit. Authors initially listed this outcrop as Mississippian in age. However, later workers have shown that the Three Forks Shale is all Devonian in age.

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; lithified, yellow siltstone

Reposited in the USGS

Primary reference: G. D. Robinson. 1963. Geology of the Three Forks Quadrangle, Montana. United States Geological Survey Professional Paper 370:1-143 [J. Alroy/M. Sommers/J. Ju]more details

PaleoDB collection 7203: authorized by John Alroy, entered by Mike Sommers on 16.05.2000

Creative Commons license: CC BY (attribution)