Mud Spring, locality no. 252c (Devonian of the United States)

Where: Broadwater County, Montana (45.9° N, 111.6° W: paleocoordinates 14.2° S, 46.3° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

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

• 175-195 feet below Lodgepole Limestone, 100-120 feet below base of upper siltstone unit.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified, ferruginous, brown, red limestone and green shale

• reddish brown limestone interbedded with olive shale

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 7232: authorized by John Alroy, entered by Mike Sommers on 19.05.2000

Creative Commons license: CC BY (attribution)

Taxonomic list

• only brachiopods and cephalopods listed
Show authors, comments, and common names
Strophomenata
 Productida - Productellidae
Productella coloradoensis, Productella cf. plicata
Rhynchonellata
 Athyridida - Athyrididae
Cleiothyridina devonica
 Rhynchonellida - Camarotoechiidae
Camarotoechia sp.
Camarotoechia sp. Hall and Clarke 1893
 Spiriferida - Cyrtospiriferidae
Cyrtospirifer cf. animasensis, Cyrtospirifer gallatinensis, Cyrtospirifer monticola
 Spiriferida - Ambocoeliidae
? Ambocoelia gregaria
 Spiriferida - Spiriferidae
Spirifer aff. raymondi