Where: Las Animas County, Colorado (37.5° N, 104.6° W: paleocoordinates 41.7° N, 71.7° W)

• coordinate stated in text

• small collection-level geographic resolution

When: Niobrara Formation (Colorado Group), Santonian (86.3 - 83.6 Ma)

• "From top of Niobrara very near Pierre contact."

• bed-level stratigraphic resolution

Environment/lithology: marine; chalk

Size class: macrofossils

Collected by E. H. Colbert; reposited in the AMNH

Primary reference: D. A. Russell. 1964. The Skull of American Mosasaurs. 1-386 [M. Carrano/H. Street/P. Wagner]more details

Purpose of describing collection: general faunal/floral analysis

PaleoDB collection 107708: authorized by Matthew Carrano, entered by Hallie Street on 14.04.2011

Creative Commons license: CC BY (attribution)