Since the Pinnacles were moved to this area, the San Andreas fault has shifted 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.