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In Virginia, the three types of Precambrian rocks are metamorphic, igneous, and sedimentary. Metamorphic rocks, such as gneisses and schists, formed through high-pressure and high-temperature processes, often from older rock types. Igneous rocks, like granites, originated from cooled magma and reflect volcanic activity in the region's geological history. Sedimentary rocks, although less common in the Precambrian, can include older sedimentary deposits that underwent lithification before being metamorphosed.

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3mo ago

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