Geology

The San Francisco Bay Area’s crazy quilt-pattern of rock formations — shaped by earthquakes — are the key to understanding the region’s landscapes. From ice-age dune sand in San Francisco to recently subsided land in the Santa Clara Valley or the veritable maze of earthquake faults in the East Bay, the geology is a fascinating blueprint of the region’s natural history.

Latest from Geology

Bringing life back to Mountain Lake

February 27, 2013 by Dhyana Levey

San Francisco’s only remaining natural lake has experienced dramatic changes over its 2,000 year history, and is about to see another one.

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More visitors expected as Pinnacles becomes a national park

February 21, 2013 by Alison Hawkes

Now that it’s officially on the national park circuit, Pinnacles may be seeing more visitors as diehard national park goers add the geological wonder to their bucket lists.

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Should we be worried about asbestos in serpentine rock?

January 31, 2013 by Michael Ellis

Should we worry about asbestos in serpentine rock? Yes, a bit. In California, we have North America‚Äôs largest exposures. It’s even our official state rock.

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Why does Half Moon Bay get winter monster waves?

January 16, 2013 by Alison Hawkes

The Mavericks surf contest has been called for Sunday, January 20. As we wait for big kahunas to roll in, we ask why Half Moon Bay gets the legendary waves that become the surfer’s delight.

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Iconic Tennessee Beach arch suddenly falls into sea

January 09, 2013 by Alison Hawkes

And suddenly it was gone. The iconic rock arch at Tennessee Beach in Marin unexpectedly gave way, changing the view forever.

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Celebrate the New Year with Canopus

December 28, 2012 by Alison Hawkes

Put yourself in just the right spot at midnight on New Year’s Eve and you may be able to see the second brightest star in the sky that’s normally invisible in much of the Bay Area — Canopus.

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Cupertino cement plant cutting mercury pollution

December 05, 2012 by Samantha Juda

The Bay Area’s No. 1 mercury polluter, the Lehigh cement plant in Cupertino, is cleaning its business after the region’s air district passed the strongest air rules in the nation.

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Walking the Rift Zone at Point Reyes

February 22, 2012 by Jules Evens

Take a four-mile stroll with Jules Evens through a landscaped shaped by enormous geological forces — and full of wildlife, native plants, and a more than a few puzzles.

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From the Inside Out

January 06, 2012 by Horst Rademacher

Workers digging the new fourth bore of the Caldecott Tunnel are getting a once-in-a-lifetime view of one of the defining features of the East Bay: the range of hills that runs from San Pablo Bay south to Fremont. By visiting just a few accessible sites aboveground, you can find clues that tell the story of how these hills rose from their humble origins as deep ocean sediments and volcanic flows to the iconic fault-riddled hillsides of today.

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A Trip to the Headlands with Doris Sloan, Rock Star

November 17, 2011 by Rick Bacigalupi

Take a trip to the world-famous Marin Headlands, and back in time a few many million years, with Doris Sloan,

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