original description
Hall, J. (1845). Descriptions of organic remains collected by Captain J. C. Frémont, in the geographical survey of Oregon and North Californa. In: Frémont, J.C. Report of the exploring expedition to the Rocky Mountains in the year 1842, and to Oregon and North California. Gales and Seaton, Washington, pp. 304-310., available online at https://www.biodiversitylibrary.org/page/32560211
page(s): 307, pl. 3, figs 1, 2 [details]
From editor or global species database
Type locality "In longitude 111°, latitude 40°" [incorrect!], Tucker Quadrangle or Soldier Summit Quadrangle, Utah County, Utah, USA; Eocene, probably Green River Fm. (Hartman 2004) [details]