Where: Big Horn County, Montana (45.4° N, 108.1° W: paleocoordinates 44.8° N, 60.2° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Little Sheep Mudstone Member (Cloverly Formation), Aptian to Aptian (125.5 - 99.6 Ma)

• Ostrom's Unit V; 20 ft below Unit VI

• bed-level stratigraphic resolution

Environment/lithology: lacustrine; claystone

Size class: macrofossils

Collected by B. Brown in 1931; reposited in the AMNH

Collection methods: quarrying, mechanical,

Primary reference: J. H. Ostrom. 1970. Stratigraphy and paleontology of the Cloverly Formation (Lower Cretaceous) of the Bighorn Basin area, Wyoming and Montana. Peabody Museum Bulletin 35:1-234 [M. Carrano/M. Carrano/M. Carrano] more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 50687: authorized by Matt Carrano, entered by Matt Carrano on 19.05.2005