North side of Trapper Creek, Melrose (Triassic of the United States)

Where: Montana (45.6° N, 112.9° W: paleocoordinates 16.2° N, 33.8° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Dinwoody Formation, Griesbachian (252.2 - 251.3 Ma)

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithology not reported

Size class: macrofossils

Preservation: mold/impression

Primary reference: N. D. Newell and B. Kummel. 1942. Lower Eo-Triassic stratigraphy, Western Wyoming and Southeast Idaho. Bulletin of the Geological Society of America 53:937-996 [A. Dunhill/B. Allen]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 203172: authorized by Alex Dunhill, entered by Bethany Allen on 05.08.2019

Creative Commons license: CC BY (attribution)

Taxonomic list

Cephalopoda
 Ceratitida - Ophiceratidae
Ophiceras (Discophiceras) subkyokticum Spath 1930 ceratite
"bed 1B.5"
Rhynchonellata
 Terebratulida - Dielasmatidae
"Terebratula margaritowi" = Bittnerithyris margaritovi
"Terebratula margaritowi" = Bittnerithyris margaritovi Bittner 1899