COURTESY HAROLD O. WEIGHT Zabriskie Ruins. Opals may be found in the canyon at right.

COURTESY FRASHER’S PHOTO. POMONA, CALIF. Charcoal Pits

COURTESY FRASHER’S PHOTO. POMONA, CALIF. Typical Death Valley Canyon

COURTESY FRASHER’S PHOTO. POMONA, CALIF. Death Valley sand dunes

COURTESY FRASHER’S PHOTO. POMONA, CALIF. Effect of prehistoric convulsions