Geological Oddities in Colorado

Colorado's only active volcano last erupted around 4,000 years ago.

This National Natural Landmark is one of the best examples of a “mass wasting” in the world.

Two creeks flow out of either end of this canyon in opposite directions.

A river runs through this remote valley in a very unexpected way.

Unlike most arches, this geological oddity formed in a volcanic dike.

The largest source of fossilized insects anywhere.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

16,500-acre ranch filled with American heritage, geological wonders, and a giant pile of tires is the crown jewel of an intriguing tug-of-war.

Strange red rock formations that have been attributed to a higher power for hundreds of years.

When ecosystems collide in the arid Southwest.