Milligan Creek, locality no. 56 (Devonian of the United States)

Also known as USGS D40(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)

• 70-100 feet below Lodgepole Limestone, 0-30 feet above base of upper siltstone unit.

• group of beds-level stratigraphic resolution

Environment/lithology: offshore; lithified, yellow siltstone

• orange or 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

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 7242: 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
Rhynchonellata
 Orthida - Schizophoriidae
Schizophoria sp.
Schizophoria sp. King 1850
 Rhynchonellida - Camarotoechiidae
Camarotoechia sp.
Camarotoechia sp. Hall and Clarke 1893
 Spiriferida - Spiriferidae
Spirifer raymondi
 Spiriferida - Ambocoeliidae
? Ambocoelia gregaria
 Spiriferida - Cyrtospiriferidae
Cyrtospirifer cf. animasensis, Cyrtospirifer monticola
Strophomenata
 Orthotetida - Schuchertellidae
? Schuchertella sp.