Polished rock slab showing an evaporite solution-collapse breccia in the
basal part of the
Seven Rivers Fm. The clasts are dolomite and residual clays, calcite cements, and epoxy
fills the interstices. Dissolution and collapse probably took place during Tertiary uplift but
some dissolution may also have taken place during latest Permian time. Roadside outcrop along
New Mexico Highway 137 in western Rocky Arroyo, Eddy Co., New Mexico.
© Peter A. Scholle, 1999