From Ingrid Taylar, for About.com
Zion Peak Rock Quarry - Mt. Diablo State Park
Photo © Ingrid TaylarThe Zion Peak quarry rises above the trail head at Mitchell Canyon. Rock here is quarried for use in pavement aggregate.
Geologic formations at Mt. Diablo are the result of tectonic plate movement, and date from the Mesozoic era. The Mt. Diablo State Park website has a thorough history and timeline of Mt. Diablo's geology.
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