An important chapter of the total geologic history of the Ouachita Mountains is revealed by the quartz veins and crystals. These and the associated minerals are hydrothermal deposits of probable magmatic origin, formed during the closing stage of the mid-Pennsylvanian orogeny. The metalliferous deposits of the Ouachita Mountains appear to have been formed at the time of the quartz vein deposition. This fact should be considered in dating the lead and zinc mineralization in other areas of the Mississippi Valley region.

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