Where: Socorro County, New Mexico (33.9° N, 106.7° W: paleocoordinates 36.4° N, 73.5° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Prionocyclus macombi ammonoid zone, Tres Hermanos Member (Mancos Shale Formation), Middle Turonian (93.5 - 89.3 Ma)

• About 15 m below the top of the Tres Hermanos Sandstone member.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified sandstone

Size class: macrofossils

Collected by C.M. Molenaar in 1969; 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 178793: authorized by Matthew Clapham, entered by Matthew Clapham on 16.05.2016

Creative Commons license: CC BY (attribution)