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The occurrence of oil in crystalline rocks in Colorado includes (1) seepages of oil in pre-Cambrian gneiss near the town of Golden and (2) oil in amygdaloidal cavities of basalt dikes on both flanks of the Colorado Rocky Mountains in the southern part of the state. The conclusion is reached that the oil of the seepage in the gneiss is derived from sedimentary rocks presumably of Dakota age faulted under the pre-Cambrian crystalline rocks during the Laramide revolution. The oil of the amygdaloidal cavities of basalt is ascribed to the natural distillation of organic matter of kerogen-bearing shales penetrated by the intrusions.
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