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• Structural control on the shallow ground water in the area, i.e., upper Dakota sandstone and <br />alluvium, appears to be insignificant. This is principally due to the large extent of sandstone <br />outcrops. This allows recharge to occur along topographic highs rather than structural highs with <br />water table conditions predominating. However, an artesian head may be developed if a lesser coal <br />bed or sandstone aquifer is confined by impem~eable strata. <br />• <br />n <br />U <br />2.04.5 - 6 <br />