Also known as East Fork of the Little Powder River

Where: Custer County, Montana (45.4° N, 105.3° W: paleocoordinates 51.9° N, 79.3° W)

• coordinate based on nearby landmark

• small collection-level geographic resolution

When: Hell Creek Formation (Montana Group), Late/Upper Maastrichtian (70.6 - 66.0 Ma)

• from the "Laramie Beds" (Riggs 1906), equivalent to the Hell Creek according to Knowlton (1909) and therefore Maastrichtian

• group of beds-level stratigraphic resolution

Environment/lithology: terrestrial; poorly lithified sandstone

Size class: macrofossils

Collected in 1904; reposited in the FMNH

• Field Columbian Museum collection

•location is given as "Montana" and is presumed to be the same as Riggs' "east fork of Little Powder River, in Montana" locality reported by Knowlton (1909), said by him to include "a weathered skeleton of Trachydon, partial skulls of Ceratopsia and fragments of a large carnivorous dinosaur, probably a Tyrannosaurus"

Primary reference: E. S. Riggs. 1906. The carapace and plastron of Basilemys sinuosus, a new fossil tortoise from the Laramie Beds of Montana. Field Columbia Museum Publication, Geological Series 2(7):249-256 [J. Alroy/J. Alroy]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 99441: authorized by John Alroy, entered by John Alroy on 11.11.2010, edited by Matthew Carrano

Creative Commons license: CC BY (attribution)