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Abstract

Typically, the old Precambrian basement is described as "granite" in sample descriptions of wells that have penetrated the basement. Actually, the basement is a variety of igneous and metamorphic rocks. Intrusive relations can be seen in areas, and dikes can be readily mapped on aerial photograph- Landsat images. Schists, gneisses, amphibolites, and other such rocks make up the general basement "complex."

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