Near Mingusville (now Wibaux) (Cretaceous of the United States)

Where: Wibaux County, Wyoming (44.0° N, 104.2° W: paleocoordinates 50.5° N, 78.1° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Fox Hills Formation (Montana Group), Maastrichtian (72.1 - 66.0 Ma)

• formation-level stratigraphic resolution

Environment/lithology: offshore; lithified, glauconitic, phosphatic, argillaceous sandstone

• "SS, med-greenish gray; clayey; weathers yellowish olive green; contains 50 % or more glauconite, a few phosphatic nodules, and numerous scattered limy nodules that weather to hard limonitic masses. A 1.2' bed of bentonite occurs locally at base."

Size class: macrofossils

Reposited in the USGS

Collection methods: mechanical,

Primary reference: L. T. Groves. 1990. New Species of Late Cretaceous Cypraeacea (Mollusca: Gastropoda) from California and Mississippi, and a Review of Cretaceous Cypraeaceans of North America. The Veliger 33(3):272-285 [P. Wagner/P. Wagner/P. Wagner]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 176023: authorized by Pete Wagner, entered by Pete Wagner on 22.01.2016

Creative Commons license: CC BY (attribution)

Taxonomic list

• "The fossils are ordinarily well-preserved. Most of the cephalopod shells and the inner nacreous layer of Inoceramus are aragonitic, especially specimens from above the Red Bird Silty Member. Shell material and specimens from the Red Bird member and the upper 50' of the underlying Mitten Member is partially transformed to calcite...Ammonites...of the [mid-upper third] of the Mitten Member are...entirely aragonite whereas shell material [of underlying material] is completely transformed to calcite."
Show authors, comments, and common names
Gastropoda
 Sorbeoconcha - Cypraeidae
"Cypraea squyeri n. sp." = Palaeocypraea squyeri
"Cypraea squyeri n. sp." = Palaeocypraea squyeri Campbell 1893 cowry