PBDB Collection

USGS D1958 (Cretaceous of the United States)

Also known as Pierre Shale (USGS D1958)

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

• Paleocoordinates: 53.8° N, 64.8° W (Wright 2013)

• coordinate estimated from map

• small collection-level geographic resolution

When: Baculites eliasi ammonoid zone, Kara Bentonitic Member (Lewis Shale Formation), Maastrichtian (72.1 - 66.0 Ma)

• Pierre shale, from ferro-calc concretions 137 - 189' below top of Kara member. Was upper unnamed shale of Pierre Shale, bed 95.

• bed-level stratigraphic resolution

Environment/lithology: offshore; lithified, gray shale and limestone

• "Shale. dark gray; weathers light medium gray; contains some brown weathering ls concretions 6 in thick and 9 in diam, which in upper few ft and at base are very fossiliferous."

Size class: macrofossils

Reposited in the USGS

Collection methods: mechanical,

• "[collected] from upper few feet"

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 1583: authorized by John Alroy, entered by Mike Sommers on 17.05.1999

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

Polychaeta
Serpulimorpha -	? Diploconcha sp. ? Diploconcha sp. originally entered as "? Diploconcha sp."
Cephalopoda
Ammonitida - Baculitidae	Baculites grandis Baculites grandis Hall and Meek 1855 ammonite
Ammonitida - Scaphitidae	Discoscaphites sp. Discoscaphites sp. Meek 1870 ammonite sp. nov.
Gastropoda
Opisthobranchiata - Bullidae	Bullopsis aff. cretacea Bullopsis aff. cretacea Conrad 1858 snail originally entered as "Bullopsis aff. cretacea"
Opisthobranchiata - Scaphandridae	Ellipsoscapha occidentalis Ellipsoscapha occidentalis snail
Sorbeoconcha - Naticidae	Euspira obliquata Euspira obliquata moon snail
Neogastropoda - Melongenidae	Serrifusus dakotensis Serrifusus dakotensis Meek and Hayden 1856 snail
Neogastropoda - Fasciolariidae	Graphidula culbertsoni Graphidula culbertsoni snail
Sorbeoconcha - Aporrhaidae	Drepanocheilus evansi Drepanocheilus evansi snail originally entered as "Drepanochilus evansi"
Bivalvia
Nuculanida - Nuculanidae	Nuculana evansi Nuculana evansi pointed nut clam
Nuculida - Nuculidae	Nucula planimarginata Nucula planimarginata Meek and Hayden 1857 nut clam
Pectinida - Oxytomidae	Oxytoma nebrascana Oxytoma nebrascana Evans and Shumard 1857 scallop
Pectinida - Anomiidae	Anomia sp. Anomia sp. Linnaeus 1758 jingle
Myalinida - Inoceramidae	Inoceramus incurvus, ? Inoceramus cf. fibrosus Inoceramus incurvus clam ? Inoceramus cf. fibrosus Meek and Hayden 1857 clam originally entered as "? Inoceramus cf. fibrosus"
Arcida - Cucullaeidae	"Idonearca shumardi" = Cucullaea (Idonearca) "Idonearca shumardi" = Cucullaea (Idonearca) clam