Upper Ernst Arroyo Canyon (east of Ernst Tinaja) is carved in rocks of Cretaceous age ( Buda Limestone, Del Rio Clay, and Santa Elena Formation) that form the core of Sierra Del Carmen, a mountainous ridge that runs north- to-south along the eastern side of Big Bend National Park (Maxwell, 1986) (Click here to see a stratigraphic section of Big Bend National Park).

The URL is: https://gotbooks.miracosta.edu/gonp/bibe/html/bb170.htm Last modified: 8/8/2010