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Upper Cretaceous (foreground and mid-background) and Cenozoic (background) strata along the Sagavanirktok River, 65 miles south of Prudhoe Bay. Oil seeps from Cenozoic sandstone near the top of this exposure helped guide the earliest exploration efforts in northern Alaska, contributing to the Prudhoe Bay discovery.
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Upper Cretaceous (foreground and mid-background) and Cenozoic (background) strata along the Sagavanirktok River, 65 miles south of Prudhoe Bay. Oil seeps from Cenozoic sandstone near the top of this exposure helped guide the earliest exploration efforts in northern Alaska, contributing to the Prudhoe Bay discovery.