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

Got Quakes on the Mind?

October 28, 2011 by Paul Hagey

With a handful of very noticeable earthquakes jolting the East Bay, we’re getting a lot of questions about quakes — do small ones release strain? Or foretell the Big One? We get the word from one of UC Berkeley’s top seismologists.

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Book Review: A Coast to Explore: Coastal Geology and Ecology of Central California

October 01, 2011 by David Loeb

By Miles O. Hayes and Jacqueline Michel, Pandion Books, distributed by Heyday, 2010, 352 pages, $29.95.
It’s hard to argue

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A Life in Geologic Time

July 01, 2011 by David Loeb

In the 1970s, mother and peace activist Doris Sloan was working a nonprofit desk job in a basement office in San Francisco when she got into a UC Extension Sierra field class and fell in love with geology. The rest, as they say, is history. Over the subsequent three decades spent teaching, writing, and leading field trips, Sloan has done more than anyone to make the complex geology of California and the Bay Area comprehensible and fun for those of us without PhDs.

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And This Little Spider Stayed Home

July 01, 2011 by David Lukas

Tiny turret spiders, hiding in their silk-lined tunnels near your favorite trail, just might hold some geologic secrets in their genes. “These spiders are like rocks that don’t move,” says one researcher. Who’d have thought?

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Salt Point Geology and History

December 21, 2010 by Rick Bacigalupi

Geologist Tom Williams and retired Salt Point State Park ranger Bill Walton lead a Bay Nature walk through geology and

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Read the Rocks at Castle Rock

October 13, 2010 by Rick Bacigalupi

Come along on our hike at Castle Rock State Park in the Santa Cruz Mountains. This park is a magnet

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Book Review: California Rocks! A Guide to Geologic Sites in the Golden State

October 01, 2010 by Vanessa Thill

A well-written and illustrated guide to California geology, including about a dozen spots in the Bay Area.

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Pining for the Pinnacles

October 01, 2010 by Paul McHugh

Volcanic drama, bat caves, diverse wildlife, roadless vistas: Pinnacles National Monument is definitely worth the trip. Where else can you see half a volcano, an endangered condor, and a record number of bee species in one day?

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Letter from the Publisher

July 01, 2010 by David Loeb

This issue of Bay Nature rocks!

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School of Rock

July 01, 2010 by Erik Vance

Berkeley native Erik Vance first encountered the rocks of the East Bay hills as a teenager looking for excitement. For a century, geologists at UC Berkeley have used them to teach geologic mapping, in the process unraveling the complex geology of our hills. And for decades pioneering rock climbers learned techniques here that they took with them to the Sierra and beyond.

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