ammonites
USGS "blue file" Loc. 13396 (Carboniferous of the United States)

Where: Fergus County, Montana (46.9° N, 109.1° W: paleocoordinates 5.4° N, 35.2° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Heath Formation, Serpukhovian (326.4 - 318.1 Ma)

• bed-level stratigraphic resolution

Environment/lithology: offshore; lithified, brown, gray shale

• Some of the upper Heath MAY be estuarine/non-marine as noted by the author. These localities contain wood and other plant fragments, are non-calcareous and contain no marine fossils. These localities have been omitted by me [MS].
• shale, dark grayish-brown, weathers gray, poorly exposed.

Reposited in the USGS

Collection methods: surface (in situ),

Primary reference: W. H. Easton. 1962. Carboniferous formations and faunas of central Montana. United States Geological Survey Professional Paper 348:1-126 [J. Alroy/M. Sommers] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 5633: authorized by John Alroy, entered by Mike Sommers on 09.11.1999

Creative Commons license: CC BY-NC-ND (attribution-noncommercial-no derivatives)