Collapse of overburden over burning coal seam
Collapse of overburden over burning coal seam
Burning coal seam. Fort Union formation.
Burning coal seam. Fort Union formation.
Badlands. Fort Union formation. Paleocene
Badlands. Fort Union formation. Paleocene
Badlands. Fort Union formation. Paleocene
Badlands. Fort Union formation. Paleocene
Little Missouri River in Badlands, Theodore Roosevelt Park
Little Missouri River in Badlands, Theodore Roosevelt Park
Large boulder in finer gravel. Flaxville formation
Large boulder in finer gravel. Flaxville formation
Badlands. Fort Union formation (Paleocene)
Badlands. Fort Union formation (Paleocene)
Ironstone concretions in Eagle sandstone
Ironstone concretions in Eagle sandstone
Kepperlites sp. Rierdon formation. Morrison Dome.
Kepperlites sp. Rierdon formation. Morrison Dome.
Lodgepole Canyon, Little Rocky Mountains
Lodgepole Canyon, Little Rocky Mountains
Mission Canyon, Little Rocky Mountains
Mission Canyon, Little Rocky Mountains
Mission Canyon, Little Rocky Mountains, Montana
Mission Canyon, Little Rocky Mountains, Montana
Lodgepole Canyon, Little Rocky Mountains, Montana
Lodgepole Canyon, Little Rocky Mountains, Montana
Basic intrusive related to Bearpaw Mountains, Montana
Basic intrusive related to Bearpaw Mountains, Montana
Open Glory hole in Porphyry, gold mine, Ruby Gulch
Open Glory hole in Porphyry, gold mine, Ruby Gulch
