USGS D2904, Red Bird (Cretaceous of the United States)

Where: Niobrara County, Wyoming (43.2° N, 104.3° W: paleocoordinates 49.4° N, 72.4° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Mitten Black Shale Member (Pierre Shale Formation), Early/Lower Campanian (83.5 - 70.6 Ma)

• Unit 21, 217-233 feet above the base of the Mitten Member

• group of beds-level stratigraphic resolution

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

• "shale, black gray, weathers soft, flaky, contains small gray to grayish orange weathering ls concretions at 22, 26, 27, 33, 37, and 38 ft above base, and persistent beds of grayish orange to light brown weathering shaly ls (cone-in-cone structure) at base and 18 ft above base, grayish orange weathering phosphatic nodules and fossiliferous ls concretions present 5-18 ft above base."

Size class: macrofossils

Preservation: original aragonite

Collected by W.A. Cobban in 1960; 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 186542: authorized by Matthew Clapham, entered by Matthew Clapham on 24.06.2017

Creative Commons license: CC BY (attribution)

Taxonomic list

Bivalvia
 Myalinida - Inoceramidae
Cephalopoda
 Ammonitida - Scaphitidae
Hoploscaphites sp. Nowak 1911 ammonite
 Ammonitida - Baculitidae
Baculites cobbani Khakimov 1976 ammonite