49 million years ago, what is known as a catastrophic detachment occurred in the Absaroka mountain range, causing what is now known as Heart Mountain to rapidly move just under 70 miles to it's current location.
The majority of avian species perch, and in it is a fairly new trait in their evolution. Found at Wyoming's Fossil Butte, this is the oldest bird of its kind.
49 million years ago, what is known as a catastrophic detachment occurred in the Absaroka mountain range, causing what is now known as Heart Mountain to rapidly move just under 70 miles to it's current location.