An earthquake fault named the Maacamas passes diagonally through our land. Unlike the nearby San Andreas fault which is a slip/slide fault, the Maacamas is a thrust fault creating an upper Napa plate passing into Napa Valley and a lower Sonoma plate sinking beneath the Mayacmas Mtns. This Maacamas fault passes from left to right through the center of this photo. The exposed tuff and ash are the upper Napa plate and the foreground Meadow covers the lower Sonoma plate. Photographed June 10, 2011 at Rose Woods.
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