Where: Walworth County, South Dakota (45.5° N, 100.4° W: paleocoordinates 51.2° N, 73.4° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Baculites grandis ammonoid zone, Pierre Shale Formation (Montana Group), Maastrichtian (72.1 - 66.0 Ma)

• from "intervals of shale ten to twenty-five feet thick" (apparently meaning in a given outcrop)

• group of beds-level stratigraphic resolution

Environment/lithology: coastal; lithified, concretionary, sideritic, calcareous shale

Size class: macrofossils

Preservation: concretion

Collected by G. A. Bishop; reposited in the USNM

Primary reference: G. A. Bishop. 1972. Moults of Dakoticancer overanus, an Upper Cretaceous crab from the Pierre Shale of South Dakota. Palaeontology 15(4):631-636 [J. Alroy/J. Alroy]more details

Purpose of describing collection: taphonomic analysis

PaleoDB collection 90230: authorized by John Alroy, entered by John Alroy on 14.07.2009

Creative Commons license: CC BY (attribution)