[Geology2] Diatomaceous Earth In That Volcanic Province?

Would somebody be able and willing to explain to me how this material formed in such an otherwise volcanic region?

From the pages of the Redding Record-Searchlight 50 years ago:

1963: Diatomaceous earth would be mined near Lake Briton by a Covina company.
The D and F Mining Co. bought rights to 1,200 acres of diatomaceous earth.
The company was the only bidders when the U.S. Forest Service offered the deposit for sale.

Source: http://www.redding.com/news/2013/jan/24/today-in-history-jan-25-2013/

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