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Sense of Place: How ‘The Cedars’ got its name

Sunday, January 6th, 2013 | Posted by

“The Cedars”

“The Cedars” is located about seven miles north of Cazadero, in the middle of Sonoma County’s sparsely populated northwest, one of the most remote places in the region.

It was probably named by the U.S. Geological Survey in the 1940s. Locals have called the area “Red Slide” since the 19th century. “Cedars” refers to the extensive woodlands and pygmy forests of Sargent cypress found there.

This conifer grows only on serpentine soils, which are high in magnesium and iron. Many plants can’t survive such conditions; those that can sometimes evolve into new species. Hence The Cedars is home to at least seven plants found nowhere else in the world, including forms of manzanita, fairy lantern and jewel flower.

This island of rare plants and unusual soils points to a rare geologic event. Long ago, the Earth’s mantle, which normally lies deep underground, pushed through the crust all the way to the surface, creating thousands of acres of peridotite rock. This peridotite weathered into The Cedars’ serpentine soils.

Because of its geology, The Cedars’ springs and seeps are highly alkaline (pH 11 or 12) and saturated with methane and hydrogen. Biologists consider them to be one of the harshest environments on Earth and extremely hostile to life.

If The Cedars sounds otherworldly, it is. Conditions in its springs are thought to resemble that of the early Earth and Mars. Amazingly, scientists have found unique microbes living in them — microbes thought to be fundamentally different from nearly all other known life forms. They may provide clues about life on other planets.

Roger Raiche, who has championed protection of The Cedars for many years, calls it “an area of great botanic, geologic, and scenic magnificence.” To preserve this hidden jewel, The Cedars is not open to the public, but guided tours can be arranged through thecedarsfriends@gmail.com.

You can reach Glen Ellen-based historical ecologist Arthur Dawson at baseline@vom.com. 

  • Mary Agneberg

    This is a fascinating topic, I’ve heard about them before and always wondered always wondered where the Cedars
    we’re located.

    • http://www.brendancoen.com Brendan Coen

      I think it’s this reddish brownish patch that stands out on the satellite maps.


      • http://www.sonomahistory.com Arthur Dawson, author


        You’re exactly right–the reddish brown patch that stands out like a sore thumb on the Google satellite image is the Cedars. Very cool!

        Arthur Dawson

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