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Metamorphic Rocks of Ring Mountain, Tiburon. At only 602 feet in elevation, Ring Mountain is hardly a mountain. But it is well known to geologist and biologist alike because of its unusual geology and the unique plants that grow in the serpentine soils on the Tiburon peninsula. Serpentine is a metamorphic rock: a rock changed by heat and pressure. The high concentration of magnesium and calcium in the soils is usually toxic to plants, but some rare plants thrive [see: http://www.marin.cc.ca.us/~jim/ring/rplant.html].
Metamorphic Rocks. Metamorphic rocks are formed due to metamorphism from existing igneous or sedimentary rocks, or even from existing metamorphic rocks. When existing rocks undergo changes due to high pressure and/or high temperature and/or high shearing stresses, metamorphic rocks are formed. Igneous rocks are the oldest rocks, while metamorphic are being derivative of igneous rocks and sedimentary rocks. - Igneous rocks are the major proportion (nearly 95%) of the total rocks, while metamorphic rocks are found in a very small percentage.