Great Sand Dunes, CO
Columnar Basalt, Pilot Rock, OR
Columnar Basalt, Pilot Rock, OR
Columnar Basalt, Pilot Rock, OR
Soda Dam, NM
Ignimbrite Tepe Structures, los Frijoles, NM
Los Frijoles Canyon, NM
Igneous Dike, NM
Fold, Twin Gorge, Canon City, CO
Fold, Twin Gorge, Canon City, CO
Colorado National Monument
Colorado National Monument
Sulfer Creek, UT
Chimney Rock, UT
Convelute bedding, Ashfall Fossil Beds State Historical Park
Ash Fall State Park, Royal, NE
Ash Fall State Park, Royal, NE
Crater Lake National Park, OR
Painted Hills, OR
Painted Hills, OR