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Map showing locations of chemically analyzed samples and sample dated by potassium-argon method: Supplement 8 from "Geology of the Hackberry Mountain Volcanic Center, Yavapai County, Arizona" (Thesis)
The Hackberry volcano in central Arizona, is a large dacitic volcano of late Miocene age. Most of the Hackberry Mountain area is underlain by Miocene volcanic rocks, primarily basalt and dacite. The oldest are a heterogeneous group of basalt flows, the Hickey Formation, erupted from local cinder con
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