The Ouachita orogeny was a mountain-building event that resulted in the folding and faulting of strata currently exposed in the Ouachita Mountains. The more extensive Ouachita system extends from the
The Ouachita Mountains lie south of the Arkansas River valley which separates them from the Ozark plateau.
The Solitario is a large geologic formation in Big Bend Ranch State Park in West Texas. When viewed from above, it suggests an impact crater; though it is actually the eroded remains of a laccolith. T
Solitario Peak (4786 ft) is a prominent geologic feature of Solitario