The upper part of this mountain is Paleozoic limestone (Ordovician to Mississipian periods), sitting over a Paleogen formation. The usual explanation for this inversion is that a large sheet of Paleozoic rock slid over more recent sediments, tens of kilometers from northwest. Posterior erosion left this piece named Heart Mountain.
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Photo taken in Cody, WY 82414, USA
Misplaced? Suggest new location