USGS D11969, Section 1 [Fort Hays Limestone Mbr, Niobrara Fm] (Cretaceous of the United States)

Where: Colfax County, New Mexico (36.4° N, 104.6° W: paleocoordinates 38.0° N, 70.0° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Fort Hays Limestone Member (Niobrara Formation), Turonian (93.9 - 89.8 Ma)

• STRATIGRAPHIC RELATIONS: From the Fort Hays Limestone Mbr of the Niobrara Fm, which regionally overlies the Carlisle Shale . AGE: Very late Turonian, on the basis of inoceramid and ammonite biostratigraphy; Prionocyclus quadratus biozone. STRATIGRAPHIC POSITION: From near top of Fort Hays Limestone in this section.

• bed-level stratigraphic resolution

Environment/lithology: deep subtidal shelf; lithified, gray limestone

• ENVIRONMENT: Offshore marine carbonate environment.
• SPECIFIC LITHOLOGY: Limestone, gray, massive; weathers to irregular pieces; hard, dense. LITHIFICATION: Lithified, on the basis of facies description.

Size class: macrofossils

Preservation: cast, mold/impression

Collected by Scott, Cobban, Merewether, Buckhorn in 1984; reposited in the UNSM

• 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: general faunal/floral analysis

PaleoDB collection 82213: authorized by Austin Hendy, entered by Austin Hendy on 24.07.2008

Creative Commons license: CC BY (attribution)

Taxonomic list

• COVERAGE: Probably not exhaustive, but comprising representative and common bivalves and cephalopods. NOMENCLATURE: Not an authoritative publication, but with modern nomenclature, and identifications to species-level.
Cephalopoda
 Nautilida - Nautilidae
Eutrephoceras sp. Hyatt 1894 nautiloid
 Ammonitida - Baculitidae
Baculites sp. Lamarck 1799 ammonite
Bivalvia
 Myalinida - Inoceramidae
 Ostreida - Ostreidae
? Margostrea sp. Vialov 1936 oyster
Ostrea sp. Linnaeus 1758 oyster