First Breaks South of Harrison ( of the United States)

Where: Sioux County, Nebraska (42.4° N, 103.8° W: paleocoordinates 43.3° N, 98.8° W)

• coordinate based on political unit

When: Harrison Formation, Harrisonian (24.8 - 18.5 Ma)

Environment/lithology: terrestrial

Primary reference: J. H. Wahlert. 1983. Relationships of the Florentiamyidae (Rodentia, Geomyoidea) based on cranial and dental morphology. American Museum Novitates 2769:1-23 [J. Alroy/J. Alroy/J. Marcot]more details

PaleoDB collection 17781: authorized by John Alroy, entered by John Alroy on 18.10.1995

Creative Commons license: CC BY (attribution)

Taxonomic list

Mammalia
 Rodentia - Florentiamyidae
Sanctimus falkenbachi n. sp. Wahlert 1983 rodent
"6 or 7" miles S of Harrison