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Geologic Trips, Angel
Island Perimeter Road Angel Island is a State Park and is easily
accessible by ferry from Tiburon or Fisherman’s Wharf. The ferry dock is at
Ayala Cove and from there the easy
5-mile Perimeter Road provides good access to the island. Most Franciscan rocks
have not been metamorphosed, however, the Franciscan rocks that
make up Angel Island are metamorphosed by extreme high pressure in the
subduction zone. These rocks must have
been carried to greater depths in the subduction zone than most Franciscan
rocks. You can see examples of all of the metamorphic rocks of the Angel
Island terrane during a trip to Angel Island: schistose
sandstone at Ione Point, blueschists at Camp Reynolds, schists and
metamorphosed pillow basalt at Perle’s Beach, and metamorphosed serpentine a short distance north of Perle’s Beach. Angel Island was an important military base
during the Civil War. Stuart Point (lower photo), at the western tip of the
Island, provides a commanding view of San Francisco Bay, as shown in this
Civil War reenactment. Stewart Point is formed from hard pillow basalt of the
Angel Island terrane. Exterior Websites Angel Island Conservancy: California State Parks: Wikipedia:
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Civil war reenactment at Stewart Point. |