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)
• 68-70 feet below Lodgepole Limestone, 32-30 feet below base of upper siltstone unit.
• group of beds-level stratigraphic resolution
Environment/lithology: offshore; lithified, yellow siltstone
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 7245: authorized by John Alroy, entered by Mike Sommers on 19.05.2000
Creative Commons license: CC BY (attribution)
Taxonomic list
Strophomenata | |
Schuchertella sp. Girty 1904 | |
"Avonia ? arcuata" = Dictyoclostus arcuatus
"Avonia ? arcuata" = Dictyoclostus arcuatus Hall 1858 | |
Rhynchonellata | |
Camarotoechia sp. Hall and Clarke 1893 | |
Cyrtospirifer sp. Nalivkin 1924 | |
Spirifer sp. Sowerby 1818 |