5. Dacite Dacite is an igneous, volcanic rock. It is composed of Andesite and Rhyolite. Bishop Peak is primarily composed of dacite. Magma from its days as a volcano welled up underneath a layer of softer rock and solidified. The softer overlying rock has eroded away over the years, leaving the dacite.
6. Serpentine Serpentine is a metamorphic rock that is formed at low-temperatures. It is created through a reaction involving heat and water in which low-silica mafic and ultramafic rocks are oxidized. Serpentine is the second most common rock found on the “Nine Sisters.” I was lucky enough to find one large sample on the peak, and also some stones of Serpentine at the Learning Pine Arboretum.
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8. The Learning Pine Arboretum Exploration site: Cal Poly, San Luis Obispo What: An outdoor “living laboratory” of beautiful and interesting landscape plants Who: Run by the Environmental Horticultural Science facility Where: Located on five acres of Cal Poly’s campus, overlooking the Santa Lucia Mountains When: I visited on July 22, 2011 Why: To display sunning landscapes teach about plants from around the globe