USGS D934 (Cretaceous of the United States)

Where: Glacier County, Montana (48.6° N, 113.0° W: paleocoordinates 53.0° N, 74.7° W)

• coordinate based on political unit

• small collection-level geographic resolution

When: Scaphites depressus ammonoid zone, Marias River Shale Formation, Late/Upper Coniacian (89.3 - 85.8 Ma)

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified shale

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 100166: authorized by Wolfgang Kiessling, entered by Uta Merkel on 01.12.2010

Creative Commons license: CC BY (attribution)

Taxonomic list

 Myalinida - Inoceramidae
"Sphenoceramus "sp. A"" = Inoceramus (Sphenoceramus) Böhm 1915 clam
Inoceramus glacierensis n. sp. Walaszczyk and Cobban 2006 clam
Inoceramus undabundus Meek and Hayden 1862 clam