Where: Colfax County, New Mexico (36.3° N, 104.8° W: paleocoordinates 38.4° N, 70.7° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Prionocyclus quadratus ammonoid zone, Smoky Hill Shale Member (Niobrara Formation), Late/Upper Turonian (93.5 - 89.3 Ma)

• STRATIGRAPHIC RELATIONS: From the Smoky Hill Shale Mbr of the Niobrara Fm, which regionally overlies the Fort Hays Limestone. AGE: Santonian, on the basis of inoceramid and ammonite biostratigraphy; Prionocyclus quadratus biozone. STRATIGRAPHIC POSITION: Bed 16, in upper shale unit, from near top of section. PJW: Prionocyclus quadratus is Late Turonian.

• bed-level stratigraphic resolution

Environment/lithology: offshore; lithified, gray limestone

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 82259: authorized by Austin Hendy, entered by Austin Hendy on 25.07.2008

Creative Commons license: CC BY (attribution)