Keywords: CO Mineral Belt.jpg 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 own Omphacite BadJPEG Structural geology maps Geological maps of Colorado |