Between Madison and Gallatin rivers (Neogene of the United States)

Where: Gallatin County, Montana (45.7° N, 111.4° W: paleocoordinates 46.0° N, 109.7° W)

• coordinate based on nearby landmark

• basin-level geographic resolution

When: Loop Fork Formation, Hemphillian (10.3 - 4.9 Ma)

• member-level stratigraphic resolution

Environment/lithology: terrestrial; lithology not reported

Size class: macrofossils

Collected by A. Thompson in 1902; reposited in the AMNH

Primary reference: O. P. Hay. 1908. The fossil turtles of North America. Carnegie Institution of Washington Publication 75:1-568 [M. Carrano/M. Carrano/M. Carrano]more details

Purpose of describing collection: taxonomic analysis

PaleoDB collection 191918: authorized by Evangelos Vlachos, entered by Evangelos Vlachos on 22.02.2018

Creative Commons license: CC BY (attribution)

Taxonomic list

 Testudines - Pantestudinidae
"Testudo impensa n. sp." = Hesperotestudo osborniana
"Testudo impensa n. sp." = Hesperotestudo osborniana Hay 1904 turtle
AMNH 5867 (holotype), a skull, shell, and appendicular elements (Hay 1908, figs, 566–571, pls. 76, 77).