Buck Creek pens, Johnson Brothers Ranch (Cretaceous of the United States)

Also known as Triceratops type site, Lance Creek, Guernsey, Three-Nine

Where: Niobrara County, Wyoming (42.2° N, 104.5° W: paleocoordinates 48.8° N, 79.2° W)

• coordinate estimated from map

• small collection-level geographic resolution

When: Lance Formation, Maastrichtian (72.1 - 66.0 Ma)

• "Laramie"

• bed-level stratigraphic resolution

Environment/lithology: fluvial-lacustrine; poorly lithified, concretionary, yellow, calcareous sandstone and shale

• "a hard calcareous sandstone concretion which had weathered out of a stratum of soft, light, yellow, heavily bedded sandstone, about 20 feet thick, near the middle of that series of fresh-water sandstones and shales..."

Size class: macrofossils

Preservation: concretion

Collected by E. B. Wilson, J. B. Hatcher & C. A. Guernsey in 1888–1889; reposited in the YPM

Collection methods: quarrying, mechanical,

• YPM collections data cite J. B. Hatcher and Charles A. Guernsey, 1889 as collectors

Primary reference: O. C. Marsh. 1889. Notice of new American Dinosauria. The American Journal of Science and Arts, series 3 38:331-336 [M. Carrano/M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 46119: authorized by Matthew Carrano, entered by Matthew Carrano on 03.01.2005

Creative Commons license: CC BY (attribution)

Taxonomic list

Reptilia
 Neornithischia - Ceratopsidae
"Ceratops horridus n. sp." = Triceratops horridus
"Ceratops horridus n. sp." = Triceratops horridus Marsh 1889 ceratopsid
YPM 1820 (= Sk. 1)