Robert Sibley Volcanic Regional Preserve

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Robert Sibley Volcanic Regional Preserve is located in the Berkeley Hills just east of Oakland, California, USA. Though it can only be entered via Oakland, it actually lies almost entirely within Contra Costa County.

The park was one of the first three parks established by the East Bay Regional Parks District (EBRPD) in 1936. It was originally named Round Top Regional Park. Round Top (elevation 1,761 feet/537m) is an extinct volcano in the Berkeley Hills. It is home to several stone labyrinths of recent origin. The park was re-named for the second president of the EBRPD, Robert Sibley, shortly after his death.

The preserve contains a volcanic center that, about 10 million years ago, produced most of the lavas that underlie the East Bay ridges from Inspiration Point in Tilden Regional Park to Moraga; geologists refer to this local volcanism as the Moraga Volcanics. Subsequent compressive strains produced by various local faults including the Hayward Fault folded the lava-bearing rock formations, tilting the Round Top vent complex on its side. Folding, erosion, and a quarry operation exposed a cross section of the great volcano, providing an excellent means to study a Central Coast range volcano. Lava within the vent has been dated by UC Berkeley at 9.5 million years old.

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v t e East Bay Regional Parks
Parks	Alvarado Park Anthony Chabot Briones Castle Rock Contra Loma Coyote Hills Crockett Hills Del Valle Diablo Foothills Dublin Hills Dry Creek Pioneer Garin Lake Chabot Pleasanton Ridge Redwood Ridgelands Sobrante Ridge Tassajara Ridge Temescal Tilden Vargas Plateau Wildcat Canyon
Shorelines	Antioch/Oakley Big Break Brooks Island Carquinez Strait Hayward Martin Luther King Jr. Miller/Knox Oyster Bay Point Isabel Point Pinole Radke Martinez
Preserves/open spaces	Bishop Ranch Black Diamond Mines Brushy Peak Claremont Canyon Five Canyons Huckleberry Leona Canyon Mission Peak Morgan Territory Sibley Round Valley Sobrante Ridge Sycamore Valley Vasco Caves Waterbird
Wilderness areas	Las Trampas Ohlone Sunol
Recreation areas	Cull Canyon Don Castro Kennedy Grove Quarry Lakes Roberts Shadow Cliffs
Trails	Alameda Creek Iron Horse
Other	Ardenwood Historic Farm Browns Island Crown Memorial State Beach Eastshore State Park Hoffman Marsh Little Hills Picnic Ranch Point Molate Beach Park Breuner Marsh (now Dotson Family Marsh)

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