Them's some old rocks. They're erosion-resistant metamorphic rocks from the late Precambrian to Cambrian eras, primarily composed of schist, gneiss, and metagraywacke. Excellent photo.
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Them's some old rocks. They're erosion-resistant metamorphic rocks from the late Precambrian to Cambrian eras, primarily composed of schist, gneiss, and metagraywacke. Excellent photo.