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Research Reports
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Sibley Volcanic Regional Preserve - East Bay residents have a volcano in their backyard at Sibley Volcanic Regional Preserve. Originally called Round Top Park, Sibley shares with Temescal and Tilden the distinction of being one of the East Bay Regional Park District's original parks. The preserve was later named in honor of Robert Sibley, who helped found the District and served for 10 years on its board of directors. Round Top, one of the area's highest peaks, is made up of lava and volcanic debris left over from a 10-million-year-old volcano. During the past 10 million years, massive tectonic forces on the Hayward and Moraga earthquake faults uplifted the Berkeley hills, folding bedrock formations and tilting the Round Top volcano complex on its side.
An unstaffed visitor center at the Skyline Boulevard staging area has displays illustrating the preserve's geology. A self-guided brochure is available at the staging area highlighting the preserve's geological features so guests can stroll the park and learn of its historic significance at their own leisure. Several trails provide access throughout the preserve. The 31-mile East Bay Skyline National Recreation Trail, part of the Bay Area Ridge Trail system, traverses the preserve along the ridgeline between Wildcat Canyon and Anthony Chabot Parks. Round Top Road goes from the Sibley visitor center to the top of Round Top. Round Top Loop Trail circles Round Top peak. Volcanic Trail, once a quarry haul road, contains most of the stops on the self-guided volcanic tour.
Trails are multi-use for hikers, equestrians, and mountain bikers. Narrow gauge trails are available to hikers and equestrians only. Dogs are permitted at Sibley, but are not allowed on adjacent Huckleberry trails.
For more information on these and other East Bay Regional Park District parks, recreation facilities, and open space preserves, call 1-88-EBPARKS (1-888-327-2757) or visit www.ebparks.org.
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