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34 million years ago (late Eocene)

Find the clickable hot spots for details and evidence, or follow the links below. (Click to see larger image)

Description: A few million years after a catastrophic volcanic eruption, palm trees and other plants have slowly recolonized the landscape. Rivers and streams have carved out new pathways in the concretelike volcanic rock. Intermittent heavy rains cause catastrophic floods to roar down the shallow canyons—sweeping up unfortunate rhinos, titanotheres, and anything else in their path!

Formation: Castle Rock Conglomerate

Artist: Jan Vriesen

Best Viewing Spots:

  • Rock Park (Castle Rock)
  • Castlewood Canyon State Park

The lower slopes of Castle Rock are formed of Dawson Arkose and only the rectangular chunk at the top of Castle Rock is composed of the Castle Rock Conglomerate.

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