MolluscaBase taxon details
original description
Yen, T.-C. (1954). Nonmarine Mollusks of Late Cretaceous Age From Wyoming, Utah and Colorado. Part 2: Faunas from eastern Utah and western Colorado. <em>United States Geological Survey Professional Paper.</em> 254-B: 59-66. page(s): 61, pl. 18, figs 13, 14 [details] Available for editors [request]
From editor or global species database
Type locality USGS Mesozoic loc. 13790 or 13970 (numbers mixed up); in NW corner SW 1/4 sec. 29, T. 7 S., R. 104 W., near Closure, Colorado; 40 feet above highest Carbonera coal bed, and 375 feet above Sego sandstone [details]
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