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The fault that carved a bay: Tomales Bay rides the San Andreas
Marin history and our Zillow listing of the week
Marin Buzz
August 11, 2025
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Stand at the end of the pier in Marshall and look to the left and right. This is a perfect view of the shockingly straight Tomales Bay: an earthquake scar filled with water.
Tomales Bay sits right on top of the San Andreas Fault, where the Pacific Plate slides past North American Plate. The Pacific Plate is moving northwest, resulting in the Point Reyes Peninsula growing 1-2 inches longer per year.
On the morning of April 18, 1906, the famous 7.9 San Francisco earthquake ripped this fault line. Ranchers said fences that had been straight on Tuesday were offset by 16-20 feet when the sun rose on Wednesday.
The fault line also helps explain a Marin oddity: the rocks on the Point Reyes peninsula don’t match the rocks across the bay. The peninsula is composed of Salinian Block granite related to the Sierra Nevada which has been carried north along the fault for tens of millions of years. Geologists joke that Point Reyes is a misplaced piece of Southern California visiting Northern California.
If you want to see 1906 with your own eyes, start at Point Reyes National Seashore’s Bear Valley Visitor Center and walk the Earthquake Trail. It is less than a mile with numerous signs explaining the fault line and there is even a recreation of the fence shown above.
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Some locations are walk-able. This one certainly is, right on the waterfront in downtown Tiburon.
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