TF-3, Milligan Canyon (Devonian of the United States)

Where: Jefferson County, Montana (45.9° N, 111.7° W: paleocoordinates 14.9° S, 46.5° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Trident Member (Three Forks Formation), Middle Famennian (370.6 - 364.7 Ma)

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified shale

• Dark grey to black shale with locally abundant goethitic nodules

Size class: macrofossils

Preservation: replaced with limonite

Reposited in the MfN

Primary reference: D. Korn and A. Titus. 2006. The ammonoids from the Three Forks Shale (Late Devonian) of Montana. Fossil Record 9(2):198-212 [D. Korn/D. Korn]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 189673: authorized by Matthew Clapham, entered by Matthew Clapham on 04.11.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

Cephalopoda
 Clymeniida - Platyclymeniidae
Pleuroclymenia americana Raymond 1907 ammonite
 Goniatitida - Prolobitidae
Raymondiceras simplex Raymond 1909 ammonite
 Goniatitida - Kirsoceratidae
Pernoceras crebriseptum Raymond 1909 ammonite