Where: Larimer County, Colorado (40.7° N, 105.0° W: paleocoordinates 47.1° N, 74.4° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

When: Baculites jenseni ammonoid zone, Richard Sandstone Member (Pierre Shale Formation), Late/Upper Campanian (83.5 - 70.6 Ma)

• Pierre Shale, from gray silty limestone concretions in Richard Sandstone Member.

• group of beds-level stratigraphic resolution

Environment/lithology: marine; lithified, concretionary sandstone

Size class: macrofossils

Collected by R.G. Coffin in 1931; reposited in the USNM

Primary reference: W. A. Cobban. 1987. The Upper Cretaceous ammonite Rhaeboceras Meek in the western interior of the United States. United States Geological Survey Professional Paper 1477:1-15 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 178350: authorized by Matthew Clapham, entered by Matthew Clapham on 01.05.2016

Creative Commons license: CC BY (attribution)