Amos McNairy White William Neil Sharp 1956 About 200 uranium occurrences have been examined in the Pumpkin Buttes area, Wyoming. Uranium minerals are visible at most of these places and occur in red and buff sandstone lenses in the Wasatch formation of Eocene age. The uranium minerals are disseminated in buff sandstone near red sandstone, and also occur in red sandstone in manganese oxide concretions and uraninite concretions. application/pdf 10.3133/tem899 en Geology of the Pumpkin Buttes Area of the Powder River Basin, Campbell and Johnson Counties, Wyoming reports