orogeny

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 173
by James St. John

Pahasapa Limestone (Lower Mississippian; Wind Cave, Black Hills, South Dakota, USA) 30
by James St. John

Pahasapa Limestone (Lower Mississippian; Wind Cave, Black Hills, South Dakota, USA) 19
by James St. John

Pahasapa Limestone (Lower Mississippian; Wind Cave, Black Hills, South Dakota, USA) 36
by James St. John

Lahar (Thirtynine Mile Volcanics, Upper Eocene; 34-36 Ma; Evergreen Station South roadcut, Colorado, USA) 23
by James St. John

Pahasapa Limestone (Lower Mississippian; Wind Cave, Black Hills, South Dakota, USA) 1
by James St. John

Eclogite (Late Silurian to Early Devonian, ~400-423 Ma; Almenningen, Vestland, Norway) 21
by James St. John

Lahar (Thirtynine Mile Volcanics, Upper Eocene; 34-36 Ma; Evergreen Station South roadcut, Colorado, USA) 11
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 179
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 174
by James St. John

Pahasapa Limestone (Lower Mississippian; Wind Cave, Black Hills, South Dakota, USA) 17
by James St. John

Pahasapa Limestone (Lower Mississippian; Wind Cave, Black Hills, South Dakota, USA) 34
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 47
by James St. John

Little Missouri River, Theodore Roosevelt National Park (South Unit), Medora, North Dakota
by Ken Lund

Pahasapa Limestone (Lower Mississippian; Wind Cave, Black Hills, South Dakota, USA) 20
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 61
by James St. John

Pahasapa Limestone (Lower Mississippian; Wind Cave, Black Hills, South Dakota, USA) 18
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 113
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 62
by James St. John

Pahasapa Limestone (Lower Mississippian; Wind Cave, Black Hills, South Dakota, USA) 32
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 178
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 164
by James St. John

Pahasapa Limestone (Lower Mississippian; Wind Cave, Black Hills, South Dakota, USA) 29
by James St. John

Lahar (Thirtynine Mile Volcanics, Upper Eocene; 34-36 Ma; Evergreen Station South roadcut, Colorado, USA) 17
by James St. John

Lahar (Thirtynine Mile Volcanics, Upper Eocene; 34-36 Ma; Evergreen Station South roadcut, Colorado, USA) 2
by James St. John

Pahasapa Limestone (Lower Mississippian; Wind Cave, Black Hills, South Dakota, USA) 38
by James St. John

Massive sulfide rock (chalcopyrite-pyrrhotite-pyrite) (Otervann Volcanic Formation, Ordovician; Jakobsbakken Mine, Norway) 1
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 176
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 167
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 115
by James St. John

Pahasapa Limestone (Lower Mississippian; Wind Cave, Black Hills, South Dakota, USA) 31
by James St. John

Solution pocket in cave wall (Pahasapa Limestone, Lower Mississippian; Wind Cave, Black Hills, South Dakota, USA) 3
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 142
by James St. John

Tensleep Canyon (southern Bighorn Mountains, Wyoming, USA) 4
by James St. John

Pahasapa Limestone (Lower Mississippian; Wind Cave, Black Hills, South Dakota, USA) 28
by James St. John

Eclogite (Late Silurian to Early Devonian, ~400-423 Ma; Almenningen, Vestland, Norway) 15
by James St. John

Eclogite (Late Silurian to Early Devonian, ~400-423 Ma; Almenningen, Vestland, Norway) 18
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 180
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 172
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 80
by James St. John

Eclogite (Late Silurian to Early Devonian, ~400-423 Ma; Almenningen, Vestland, Norway) 14
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 79
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 168
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 163
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 58
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 166
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 83
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 165
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 110
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 175
by James St. John

Eclogite (Late Silurian to Early Devonian, ~400-423 Ma; Almenningen, Vestland, Norway) 19
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 157
by James St. John

Lahar (Thirtynine Mile Volcanics, Upper Eocene; 34-36 Ma; Evergreen Station South roadcut, Colorado, USA) 26
by James St. John

Lahar (Thirtynine Mile Volcanics, Upper Eocene; 34-36 Ma; Evergreen Station South roadcut, Colorado, USA) 22
by James St. John

Eclogite (Late Silurian to Early Devonian, ~400-423 Ma; Almenningen, Vestland, Norway) 13
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 153
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 43
by James St. John

Lahar (Thirtynine Mile Volcanics, Upper Eocene; 34-36 Ma; Evergreen Station South roadcut, Colorado, USA) 12
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 169
by James St. John

Nonmarine siliciclastic sedimentary rocks (White River Group, Tertiary; White River Badlands, South Dakota, USA) 81
by James St. John