The chlorine content of ground waters from Louisiana and Texas salt domes has been found useful in identifying the source of the waters and in correlation of water-bearing sands. The amount of chlorine is lowest in the near-surface waters and increases downward, reaching saturation near the salt of shallow cores but in domes of the deep-seated type rising gradually at a rather uniform rate below the 2,000-foot level. In several cases structure of the rocks is clearly suggested by chlorine concentration in ground waters.

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