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Rocks of Lake Merritt with Andrew Alden


March 3, 2023 | 7:00 pm 8:00 pm

Join Andrew Alden, author of Deep Oakland: How Geology Shaped a City, for a lakeside chat with the Rotary Nature Center.

Alden says, “The Lake entered written history as a tidal wetland and mud flat, without a single stone to be found. Today it’s armored on all sides with rock walls and decorated all over with boulders. This talk will focus on Lake Merritt’s hardscape and its unexpected treasures.”

In Deep Oakland, geologist Andrew Alden excavates the ancient story of Oakland’s geologic underbelly and reveals how its silt, soil, and subterranean sinews are intimately entwined with its human history—and future. Poised atop a world-famous fault line now slumbering, Alden charts how these quaking rocks gave rise to the hills and the flats; how ice-age sand dunes gave root to the city’s eponymous oak forests; how the Jurassic volcanoes of Leona Heights gave way to mining boom times; how Lake Merritt has swelled and disappeared a dozen times over the course of its million-year lifespan; and how each epochal shift has created the terrain cradling Oaklanders today. With Alden as our guide—and with illustrations by Laura Cunningham—we see that just as Oakland is a human crossroads, a convergence of cultures from the world over, so too is the bedrock below, carried here from parts still incompletely known.

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About the Speaker

Andrew Alden

Andrew Alden

Andrew Alden is a geologist and geoscience writer who has worked for the US Geological Survey and reported for KQED and Bay Nature. Long fascinated with rocks and landscapes, Alden found inspiration for his debut book, Deep Oakland, in the 1989 Loma Prieta earthquake, which, as he writes, “ripped the city open and revealed to us its heart and character.” Through his writing Alden raises awareness for what he calls the deep present: the appreciation of the ancient underpinnings that shape the modern-day surroundings of daily life.


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