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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