A visit to Berkeley’s Robert Sibley Volcanic Regional Preserve brings many different wonders, from a Labyrinth near the geologic remains of its ancient volcano, to serene cow pastures, to golden eagles and ferruginous hawks in flight, backlit by the sun against Mt. Tamalpais in the distance.
With incomparable views of Coast Range geology, take a self-guided tour of the park’s volcanoes, stopping at basalt lava, tuff-breccias, red-baked cinder piles, and pebbley mudstones. These are 10-million-year-old consequences of folding and erosion, as the Pacific Plate carried the Round Top volcano north, and twisted it on its side.
At the northwestern edge of the preserve lies a pond oddly close to a highway, yet filled with the songs of spring’s newest bullfrogs. Fat tadpoles or pollywogs glide between submerged forests, mini-Jaws swimming up toward you. As the City’s fog rolls in and envelops the valley in swirling mists, you experience true solitude and serenity.