CONTENTS
Page [Abstract] 1 [Introduction] 1 [Geology] 3 [Devils Tower] 3 [Sedimentary rocks] 6 [Spearfish formation] 6 [Gypsum Spring formation] 7 [Sundance formation] 7 [Stockade Beaver shale member] 8 [Hulett sandstone member] 8 [Lak member] 9 [Redwater shale member] 9 [Stream terrace deposits and alluvium] 10 [Talus and landslide material] 10 [Structure] 11 [Geologic history] 11 [Origin of Devils Tower] 12 [Selected bibliography] 13