Shell of moderate size, subtriangular, more or less excavated in front of the beaks. Postero-dorsal margin nearly ... [details]
A mile or two east of Fosston, Weld County, Colorado, United States; Laramie Formation, Maastrichtian, late Cretaceous [details]
Near Brush, Colorado, United States; Fox Hills Sandstone, Maastrichian, late Cretaceous [details]
From the Mosby sandstone, Benton Cretaceous, Fergus County, Montana (USA) [details]
"Apache County, Arizona" (no precise locality given), USA; Triassic [details]
"Near Seven Springs, Apache County, Arizona", USA; Triassic [details]