Where: Boulder County, Colorado (40.1° N, 105.2° W: paleocoordinates 46.8° N, 81.3° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Hoploscaphites birkelundae ammonoid zone, Pierre Shale Formation, Late/Upper Maastrichtian (70.6 - 66.0 Ma)

• Near the base of the upper transition member of the Pierre Shale. The label refers to impressions of Baculites clinolobatus 20 ft (6.1 m) below this specimen, suggesting that this specimen is in or just above the B. clinolobatus Zone, in the Hoploscaphites birkelundae Zone.

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified shale

Size class: macrofossils

Reposited in the USNM

Primary reference: N. H. Landman and W. A. Cobban. 2003. Ammonites from the upper part of the Pierre Shale and Fox Hills Formation of Colorado. American Museum Novitates 3388:1-45 [M. Clapham/M. Clapham]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 178306: authorized by Matthew Clapham, entered by Matthew Clapham on 30.04.2016

Creative Commons license: CC BY (attribution)