Where: Sandoval County, New Mexico (35.7° N, 106.9° W: paleocoordinates 38.2° N, 73.0° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Prionocyclus hyatti ammonoid zone, Semilla Sandstone Member (Mancos Shale Formation), Middle Turonian (93.5 - 89.3 Ma)

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified sandstone

Size class: macrofossils

Collected by N. La Fon in 1978; reposited in the USNM

Primary reference: W. J. Kennedy and W. A. Cobban. 1988. The Late Cretaceous ammonite Romaniceras Spath, 1923, in New Mexico. New Mexico Bureau of Mines & Mineral Resources Bulletin 114:23-34 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 178782: authorized by Matthew Clapham, entered by Matthew Clapham on 15.05.2016

Creative Commons license: CC BY (attribution)