Where: Sandoval County, New Mexico (35.6° N, 107.0° W: paleocoordinates 38.1° N, 73.1° 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)

• From limestone concretions about 2 m above base of Semilla Sandstone Member

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified, concretionary sandstone

Size class: macrofossils

Collected by C.H. Dane, E.R. Landis, W.A. Cobban in 1963; reposited in the USNM

Primary reference: W. A. Cobban and S. C. Hook. 1980. The Upper Cretaceous (Turonian) ammonite family Coilopoceratidae Hyatt in the Western Interior of the United States. United States Geological Survey Professional Paper 1192:1-28 [W. Kiessling/U. Merkel]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 178754: authorized by Matthew Clapham, entered by Matthew Clapham on 13.05.2016

Creative Commons license: CC BY (attribution)