Rock Quarry Near Mt Diablo

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The Clayton Quarry has been part of your community for over 70 years, providing a valuable source of construction aggregate for Bay Area neighborhoods, businesses, and public …

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Contra Costa County

"Henry Cowell Lime Company's lime quarries lie 3 miles south of Concord, in the foothills on the northwest end of Mount Diablo. The rock is a travertine, which outcrops over a considerable area in the vicinity of the quarries.

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Geology Road Map

This short walk will also provide an opportunity to inspect greenstone, graywacke, red chert, and a small amount of shale up close. The quarry you see to the north is producing diabase (part of the Mount Diablo …

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Walnut Creek Open Space Foundation

Just to the left of the entrance at Sutherland, there are several mid-sized rocks with seashells that came from these quarries. These quarries were excavated for landfills around this part of Walnut Creek. The summit building on Mt. Diablo is …

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Blackhawk Ranch Quarry

The Blackhawk Ranch fossil quarry is located south of Rock City on the lower slopes of Mount Diablo. During the Late Miocene, approximately 9-10 million years ago, this region was a rolling lowland. (A historical marker …

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Clayton Quarry

The quarry is located on Mount Zion and the material mined is diabase, a hard, durable rock used in the construction of roads, buildings, rail lines, dams, and levees. Over 25 different products are made to supply …

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