CORRECT!

Coyotes, jackrabbits, and rattlesnakes are only recent new-comers to West Texas. Throughout most of its early history, this area has been covered by warm, shallow seas that had an abundance of clams, snails, and corals, as well as other marine life forms.

The El Paso area may have looked very much like this in its early years (From Earth History Resources, a view of a Permian reef.)