USGS Loc. D1637 & D1947 [Pierre Shale] (Cretaceous of the United States)

Also known as Loc. 19 (of Kennedy et al. 2000)

Where: Niobrara County, Wyoming (43.3° N, 104.3° W: paleocoordinates 49.4° N, 72.4° W)

• 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)

• AGE: Late Campanian, on the basis of ammonoid biostratigraphy; Exiteloceras jenneyi zone.

• bed-level stratigraphic resolution

Environment/lithology: offshore; lithified, concretionary, ferruginous, shelly/skeletal, brown, gray shale and limestone

• "shale, weathers darker gray than overlying unit, contains numerous brown weathering ls concretions crowded with fossils."
• "shale, weathers darker gray than overlying unit, contains numerous brown weathering ls concretions crowded with fossils."

Reposited in the USGS

Collection methods: mechanical,

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 1639: authorized by John Alroy, entered by Mike Sommers on 19.05.1999

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
 Basommatophora - Siphonariidae
Anisomyon borealis
Anisomyon borealis Morton 1842 pulmonate
 Trochoidea - Turbinidae
? Atira nebrascensis
? Atira nebrascensis snail
originally entered as "? Atira nebrascensis"
Bivalvia
 Ostreida - Pteriidae
"Pteria linguaeformis" = Phelopteria linguaeformis
"Pteria linguaeformis" = Phelopteria linguaeformis Evans and Shumard 1854 pearl oyster
 Ostreida - Ostreidae
Ostrea sp.
Ostrea sp. Linnaeus 1758 oyster
 Myalinida - Inoceramidae
Inoceramus sp.
Inoceramus sp. Sowerby 1814 clam
sp. nov.
 Nuculanida - Nuculanidae
Nuculana sp.
Nuculana sp. Link 1807 pointed nut clam
Cephalopoda
 Ammonitida - Nostoceratidae
Exiteloceras jenneyi
Exiteloceras jenneyi Whitfield 1877 ammonite
 Ammonitida - Baculitidae
Baculites rugosus
Baculites rugosus Cobban 1962 ammonite
 Ammonitida - Diplomoceratidae
Solenoceras sp.
Solenoceras sp. Conrad 1860 ammonite
 Ammonitida - Scaphitidae
Hoploscaphites sp.
Hoploscaphites sp. Nowak 1911 ammonite
sp. nov.
 Ammonitida - Placenticeratidae
Placenticeras intercalare, Placenticeras meeki
Bryozoa
  -
Bryozoa indet.
Bryozoa indet. Ehrenberg 1831
pyriporoid bryozoan