basis of recordYen, T.-C. (1954). Nonmarine Mollusks of Late Cretaceous Age From Wyoming, Utah and Colorado. Part 1: A fauna from western Wyoming. <em>United States Geological Survey Professional Paper.</em> 254-B: 45-59. page(s): 55 [details] Available for editors [request]
Present Inaccurate Introduced: alien Containing type locality
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