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Town of Bedrock 

Wednesday, Apr 11 2012
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We’re tired of hearing that San Francisco is going to split open and enter the voids of hell when the next “big one” hits. Which is to say, “We already know that.” Plus, the 1906 and 1989 earthquakes are only a part of the city’s rich geological history, and rather than demonizing our lovely home, we should applaud it for being one of the most fascinating places in the world. Want proof? Corona Heights. It's home to something called a slickenside — or for those of you who aren’t geology nerds, a rock formation so shiny that in the sun we can make out our reflection. It’s a rare occurrence, and geologists travel from all around the world to see and study it. If you want to see more things like this (and learn some earthquake stuff too), head to the San Francisco Rocks Walking Tour: ’06 Anniversary Edition put on by Discovery Street Tours. This geological adventure is among numerous tours put on by science writer and self-described urban explorer Robin Marks. The 2.5-mile walk that starts at 20th and Church lasts two and a half hours and includes numerous activities that teach you about seismology. One of them, Marks says, is a model of the Earth that’s made of cheese. Wonder whether it will be served on tectonic plates?
Sun., April 15, 1:30 p.m., 2012

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