between Moreau and Grand Rivers (USGS) (Cretaceous of the United States)

Also known as L&W locality 38a

Where: Corson County, South Dakota (45.7° N, 101.4° W: paleocoordinates 51.5° N, 74.3° W)

• coordinate based on nearby landmark

• local area-level geographic resolution

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

• originally Great Lignite Formation (Miocene); "lowest member of the lignite formation"

• bed-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Collected by F. V. Hayden & Sully in the 1860s; reposited in the USGS, USNM

Collection methods: surface (float),

Primary reference: J. Leidy. 1860. Extinct vertebrates from the Judith River and Great Lignite Formations of Nebraska. Transactions of the American Philosophical Society 11:139-154 [M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 69214: authorized by Matthew Carrano, entered by Matthew Carrano on 21.02.2007

Creative Commons license: CC BY (attribution)

Taxonomic list

 Neornithischia - Hadrosauridae
Thespesius occidentalis n. gen. n. sp.
Thespesius occidentalis n. gen. n. sp. Leidy 1856 hadrosaurid
USNM 219–221