The Balconies Cave is a narrow canyon with a roof of talus.
Pinnacles National Monument gets its name from rock spires and crags that are remnants of an ancient volcano. The volcano eroded over millions of years as it moved northward along the San Andreas Fault. Rock debris in the form of boulders has weathered and settled, leaving behind spires of volcanic rock and talus caves.
Did You Know?
Pinnacles National Monument is home to 14 of the 24 bat species in California. Pinnacles provides excellent habitat for many other species as well.