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[edit] Summary
Own work: Outline of state of Colorado (USA) with approximate reproductions of the two versions of the Colorado Mineral Belt that were suggested by Tweto and Sims (Precambrian Ancestry of the Colorado Mineral Belt, Geological Society of America Bulletin 74, p. 991-1014, 1963). The principal mining districts of Laramide age are in the inner area bounded by solid lines and in a darker color. The "Maximum boundary" is shown by the dashed lines.
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