This is another photo that I found on an old roll of Fuji 800 that I somehow forgot to develop a couple of years ago. Here, Chas is climbing yet another set of volcanic rocks located at the top of the Pinnacles, after you climb up through the caves. Steph convinced me to visit this park, and I was really surprised as the caves were actually pretty exciting and the views at the top were extraordinary.
Here’s some of the info on the park from wikipedia:
The Monument is located near the San Andreas Fault, which had a hand in creating the unique formations the Monument protects. The Pinnacles are part of the Neenach Volcano which erupted 23 million years ago near present-day Lancaster, California.. The movement of the Pacific Plate along the San Andreas Fault split a section of rock off from the main body of the volcano and moved it 195 miles (314 km) to the northwest. It is believed that the pinnacles came from this particular volcano due to the unique breccias that are only found elsewhere in the Neenach Volcano formations. Differential erosion and weathering of the exposed rock created the Pinnacles that are seen today.
Large scale earth movement also created the talus caves that can be found in the Monument. Deep, narrow gorges and shear fractures were transformed into caves by large chunks of rock falling from above and wedging into the cracks leaving an open area below.
Since the Pinnacles were moved to this area, the San Andreas Fault has shifted 4 miles (6.4 km) to the East of the Monument. The original location of the San Andreas can be seen in the Chalone Creek Fault. Two other large faults are known to run through the Monument, the Miner’s Gulch and Pinnacles Faults. These faults parallel the San Andreas and were most likely caused by major movements of the main fault.
Seismic activity is frequent in the Monument and United States Geological Survey maintains two seismometers within the boundaries. Evidence of past and ongoing seismic activity can be seen in offset streams where they cross faults. Valley bottoms and terraces show signs of uplift.