Mormon Rocks

The Mormon Rocks are Miocene-age sandstone beds of the Cajon Formation. Compression and shearing along the San Andreas Fault have resulted in the tilting and re-exposure of these beds. These formations lie in the Cajon Pass, a valley carved by the San Andreas Fault where the San Gabriel Mountains (west of the fault) are being pulled toward the northwest, away from the San Bernardino Mountains (east of the fault).

Print No. A98-43-1.