List of Slides for Pinnacles NM

• The Pinnacles, located about 200 miles south of San Francisco, are distinctively rugged landforms eroded from layers of volcanic breccia of Miocene age.
• The volcanic rocks have been preserved in a fault block that moved downward. Elsewhere, the volcanic layers have been eroded away, leaving the jagged peaks of the Pinnacles within the generally smooth topography of the Coast Ranges.