Pueblo, upper concretionary subunit of the middle shale [Smoky Hill Shale] (Cretaceous of the United States)

Where: Pueblo County, Colorado (38.3° N, 104.6° W: paleocoordinates 42.5° N, 71.4° W)

• coordinate based on nearby landmark

• basin-level geographic resolution

When: Smoky Hill Shale Member (Niobrara Formation), Late/Upper Santonian (85.8 - 83.5 Ma)

• STRATIGRAPHIC RELATIONS: From the Smoky Hill Shale Mbr of the Niobrara Fm, which regionally overlies the First Hays Limestone and the Carlisle Shale . AGE: Late Santonian, on the basis of inoceramid and ammonite biostratigraphy. STRATIGRAPHIC POSITION: From the upper concretionary subunit of the middle shale.

• group of beds-level stratigraphic resolution

Environment/lithology: deep subtidal shelf; lithified, concretionary shale

• ENVIRONMENT: Offshore marine carbonate environment.
• SPECIFIC LITHOLOGY: Concretionary shale. LITHIFICATION: Lithified, on the basis of facies description and figured specimens.

Size class: macrofossils

Preservation: concretion

Reposited in the UNSM

Collection methods: surface (in situ), ,

• COLLECTORS: Scott, Cobban, Merewether, and Buckhorn (1984). REPOSITORY: USNM.

Primary reference: G. R. Scott, W. A. Cobban, and E. A. Merewether. 1986. Stratigraphy of the Upper Cretaceous Niobrara Formation in the Raton basin, New Mexico. New Mexico Bureau of Mines and Mineral Resources Bulletin 115:1-34 [A. Hendy/A. Hendy]more details

Purpose of describing collection: biostratigraphic analysis

PaleoDB collection 87855: authorized by Austin Hendy, entered by Austin Hendy on 26.03.2009

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Exhaustive for ammonoids, nautiloids, and bivalves. NOMENCLATURE: Not an authoritative publication, but with modern nomenclature, and identifications to species-level.
Bivalvia
 Myalinida - Inoceramidae
"Inoceramus (Platyceramus) platinus" = Platyceramus platinus, Inoceramus sp.
"Inoceramus (Platyceramus) platinus" = Platyceramus platinus Logan 1898 clam
Inoceramus sp. Sowerby 1814 clam
 Ostreida - Ostreidae
Ostrea sp. Linnaeus 1758 oyster
Cephalopoda
 Ammonitida - Scaphitidae
 Ammonitida - Baculitidae
Baculites sp. Lamarck 1799 ammonite