Green Mountain, near Golden (Cretaceous of the United States)

Where: Jefferson County, Colorado (39.7° N, 105.2° W: paleocoordinates 46.4° N, 81.4° W)

• coordinate based on nearby landmark

• outcrop-level geographic resolution

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

• Upper transition member of the Pierre Shale

• bed-level stratigraphic resolution

Environment/lithology: marine; lithified shale

Size class: macrofossils

Collection methods: Repository: Colorado School of Mines

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 178297: authorized by Matthew Clapham, entered by Matthew Clapham on 30.04.2016

Creative Commons license: CC BY (attribution)

Taxonomic list

Cephalopoda
 Ammonitida - Scaphitidae
Hoploscaphites cf. birkelundae Landman and Waage 1993 ammonite