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Quarry - Stone Buildings
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The rock that was quarried during the 1850s and 1860s at Rockville was volcanic tuff, a light gray rock that was soft enough to cut easily but hardened once it was excavated. Called "absolutely fireproof," the rock was used in a number of local structures.

In the early 1850s in upper Green Valley, George Dingley built the first flour mill in the area out of Rockville tuff stone. The mill was water-powered with a 40-foot wheel. Historians say that the mill was a great boost for the Solano County economy during the years it operated.

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