USGS D3629 (Cretaceous of the United States)

Where: Lewis and Clark County, Montana (47.0° N, 112.5° W: paleocoordinates 52.6° N, 75.6° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Desmoscaphites bassleri ammonoid zone, Virgelle Sandstone Formation (Montana Group), Late/Upper Santonian (85.8 - 83.5 Ma)

• top of Virgelle Sandstone

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified sandstone

Size class: macrofossils

Preservation: cast, mold/impression

Primary reference: I. Walaszczyk and W. A. Cobban. 2006. Palaeontology and stratigraphy of the Middle-Upper Coniacian and Santonian inoceramids of the US Western Interior. Acta Geologica Polonica 56(3):241-348 [W. Kiessling/U. Merkel]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 100168: authorized by Wolfgang Kiessling, entered by Uta Merkel on 01.12.2010

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Myalinida - Inoceramidae
Sphenoceramus gilli n. sp. Walaszczyk and Cobban 2006 clam