USGS D1868, D2913 [Pierre Shale] (Cretaceous of the United States)

Where: Niobrara County, Wyoming (43.3° N, 104.3° W)

• Paleocoordinates: 52.1° N, 63.0° W (Wright 2013)

• coordinate estimated from map

• small collection-level geographic resolution

When: Exiteloceras jenneyi ammonoid zone, Pierre Shale Formation, Late/Upper Campanian (83.5 - 70.6 Ma)

• COMMENTS: From lower unnamed shale of the Pierre Shale. AGE: Late Campanian, on the basis of ammonoid biostratigraphy; Exiteloceras jenneyi zone.

• bed-level stratigraphic resolution

Environment/lithology: offshore; lithified, concretionary, ferruginous, gray, red, calcareous shale

• "shale, dark gray, contains contains small reddish brown weathering ironstone concretions and larger tan weathering ls concretions that have cone-in-cone structure."
• "shale, dark gray, contains contains small reddish brown weathering ironstone concretions and larger tan weathering ls concretions that have cone-in-cone structure."

Reposited in the USGS

Collection methods: mechanical,

• "[collected] throughout unit"

Primary reference: J. R. Gill, W. A. Cobban, and P. M. Kier. 1966. The Red Bird Section of the Upper Cretaceous Pierre Shale in Wyoming. United States Geological Survey Professional Paper 393-A:1-73 [J. Alroy/M. Sommers/A. Clement]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 1642: authorized by John Alroy, entered by Mike Sommers on 19.05.1999

Creative Commons license: CC0 (CC0)

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
Bryozoa
  -
Bryozoa indet.
Bryozoa indet. Ehrenberg 1831
pyriporoid bryozoan
Cephalopoda
 Ammonitida - Nostoceratidae
Exiteloceras jenneyi
Exiteloceras jenneyi Whitfield 1877 ammonite
 Ammonitida - Baculitidae
Baculites sp.
Baculites sp. Lamarck 1799 ammonite
 Ammonitida - Scaphitidae
Hoploscaphites sp.
Hoploscaphites sp. Nowak 1911 ammonite
sp. nov.
Bivalvia
 Poromyida - Cuspidariidae
Cuspidaria variablis
 Cardiida - Arcticidae
Tenea circularis
 Lucinida - Lucinidae
Lucina cf. mattiformis
Lucina cf. mattiformis Stephenson 1941 clam
originally entered as "Lucina cf. mattiformis"
 Myalinida - Inoceramidae
Inoceramus sp.
Inoceramus sp. Sowerby 1814 clam
sp. nov.
 Ostreida - Pteriidae
"Pteria linguaeformis" = Phelopteria linguaeformis
"Pteria linguaeformis" = Phelopteria linguaeformis Evans and Shumard 1854 pearl oyster
 Ostreida - Ostreidae
Ostrea inornata
Ostrea inornata Meek and Hayden 1860 oyster
 Pectinida - Entoliidae
Syncyclonema sp.
Syncyclonema sp. Meek 1864 scallop
 Nuculanida - Nuculanidae
Nuculana sp.
Nuculana sp. Link 1807 pointed nut clam
Scaphopoda
 Dentaliida - Dentaliidae
Dentalium pauperculum