Also known as USGS D28(SD)

Where: Jefferson County, Montana (45.9° N, 111.6° W: paleocoordinates 14.2° S, 46.4° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

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

• 110-130 feet below Lodgepole Limestone, 10-30 feet below base of upper siltstone unit.

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; lithified, green shale

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

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 7243: authorized by John Alroy, entered by Mike Sommers on 19.05.2000

Creative Commons license: CC BY (attribution)