A photo of The Elephant Tusk.
By Geology and Ecology of National Parks
June 1990 (approx.)
Detailed Description
The Elephant Tusk is a prominent eroded remnant of a Tertiary-age igneous (granitic) intrusion in the Chisos Mountains of Big Bend. Prickly pear cacti grow on a ledge of Boquillas Formation in the foreground. Midway in the distance are cuestas (escarpments of gently-inclined strata) consisting of marine, transitional, and non-marine sedimentary layers of the Aguja and Javelina Formations of latest Cretaceous age (Maxwell and Lonsdale, 1966).
Sources/Usage
Big Bend National Park