original description
La Rocque, A. (1960). The molluscan faunas of the Flagstaff Formation of central Utah. <em>Geological Society of America Memoirs.</em> 78: 1-100., available online at https://doi.org/10.1130/MEM78-p1
page(s): 33, pl. 3, figs 8-9 [details] Available for editors [request]
From editor or global species database
Type locality North wall of Ephraim Canyon, NW 1/4 sec. 13, T. 17 S., R. 3 E., Sanpete County, Utah, United States; Green River Formation (Flagstaff Member), Thanetian, late Paleocene [details]