During a mountain building period called the Laramide orogeny around 65 million years ago, the Keystone Thrust Fault developed, which ran through most of North America and through the Red Rock Conservation Area.
The Keystone Thrust Fault developed, which ran through most of North America and through the Red Rock Conservation Area. This was during a mountain building period. This mountain building period was called the Laramide orogeny around 65 million years ago.