Development of an Angular Unconformity: Box Cañon, Ouray, Colorado

A Brief History of Colorado Through Time (Geology of Colorado)

Stegosaurus Snacks: Dinosaur National Monument, Northwestern Colorado, 145 Million Years Ago

Sand Planet: Northern Colorado 280 Million Years Ago

Ice Age Summer: Colorado Front Range, 16,000 Years Ago

Paleocene Rain Forest: Golden, Colorado, 64 Million Years Ago

Redwood Forest: Florissant Fossil Beds National Monument, Colorado, 34 Million Years Ago

Wray Dune Field, Wray, Colorado, 30,000 Years Ago

Cretaceous Swamp: Boulder, Colorado, 68 Million Years Ago

After Armageddon: Strasburg, Colorado, 65.5 Million Years Ago

Maritime Colorado: Pueblo, Colorado, 85 Million Years Ago

Triassic Thickets: Placerville, Colorado, 225 Million Years Ago

Slimy Shoreline: Red Rocks Park, Denver, Colorado 250 Million Years Ago

Pole Forest: Garden of the Gods, Colorado Springs, Colorado, 300 Million Years Ago

Colorado School of Mines Geology Museum - The View out the Window

Spanish Peaks, southern Colorado

Igneous rocks of Colorado. Cross sections showing different kinds of igneous intrusions.

Devonian spider

Creation of the Yule marble, near Marble, Colorado.

Devonian forest

Devonian marine life

Ordovician marine life

Cooksonia, Middle Silurian

The Geologic Evolution of Colorado National Monument

Late Eocene redwood forest, Florissant National Mounument, Colorado

Late Pleistocene glaciers of Colorado

Colorado Laramide Highlands at 57 million years

Latest Pleistocene Glaciers of the Gore Range, central Colorado