The park is located near the San Andreas fault, which had a hand in creating the unique formations the park protects.
 The Pinnacles are part of the Neenach Volcano which erupted 23 million years ago near present-day Lancaster.
 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 because of 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.
The rock formations are andesite and rhyolite, forming a dropped fault block embedded in the Gabilan Range.

Large-scale earth movement also created the talus caves that can be found in the park.
 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 four miles (6.4 km) to the east of the park.
 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 park, 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.
The establishment of the relative movement between the Pinnacles and the Neenach rocks was a significant factor in the acceptance of plate tectonics in geology.

Seismic activity is frequent in the park, 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.
The park is located near the San Andreas fault, which had a hand in creating the unique formations the park protects.  The Pinnacles are part of the Neenach Volcano which erupted 23 million years ago near present-day Lancaster.  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 because of 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. The rock formations are andesite and rhyolite, forming a dropped fault block embedded in the Gabilan Range.
Large-scale earth movement also created the talus caves that can be found in the park.  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 four miles (6.4 km) to the east of the park.  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 park, 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. The establishment of the relative movement between the Pinnacles and the Neenach rocks was a significant factor in the acceptance of plate tectonics in geology.
Seismic activity is frequent in the park, 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.
Pinnacles National Park