Where: Slope County, North Dakota (46.5° N, 104.0° W: paleocoordinates 52.7° N, 77.4° W)

• coordinate stated in text

• outcrop-level geographic resolution

When: Pretty Butte Member (Hell Creek Formation), Late/Upper Maastrichtian (70.6 - 66.0 Ma)

• bed is 12 m below lignite marking base of Ludlow Formation (and therefore top of Hell Creek).

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; gray claystone

Size class: macrofossils

Collected in 1963

Collection methods: quarrying, mechanical,

Primary reference: F. D. Holland, Jr. 1997. A North Dakota Triceratops skull. Contributions to Geology, University of Wyoming 32(1):37-50 [M. Carrano/M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 24851: authorized by Matthew Carrano, entered by Matthew Carrano on 21.08.2002

Creative Commons license: CC BY (attribution)