Also known as USGS D55(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)
• 200 feet below Lodgepole Limestone, 156-186 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 7300: authorized by John Alroy, entered by Mike Sommers on 23.05.2000
Creative Commons license: CC BY (attribution)
Taxonomic list
Cephalopoda | |
"Tornoceras crebriseptum" = Pernoceras crebriseptum
"Tornoceras crebriseptum" = Pernoceras crebriseptum Raymond 1909 ammonite | |
Raymondiceras simplex Raymond 1909 ammonite | |
"Platyclymenia (Pleuroclymenia) americana" = Pleuroclymenia americana
"Platyclymenia (Pleuroclymenia) americana" = Pleuroclymenia americana Raymond 1907 ammonite sgn. (Pleuroclymenia)
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