is a beautiful and solitary peak (8,123 ft (2,476 m)) located north of Cody, Wyoming, the eroded vestigial remnant of an enormous slide block that was emplaced nearly 50 million years ago. A ~4 km thick sheet of rock about 1,300 square kilometers in area detached from the plateau to the west, sliding rapidly on a 2 degree detachment plane tens of kilometers towards the southeast into the Bighorn and Absaroka Basins. Heart Mountain is technically a klippe, and here’s more information about the largest terrestrial mass movement on Earth.
Sunrise behind Heart Mountain.
The summit block is composed of Paleozoic-age carbonate rocks, sitting on shale of the Willwood Formation that is 300 million years younger.