Surface drainage of Tucumcari Lake east of Tucumcari, New Mexico, is dammed by eolian sand derived from the Wingate (?) sandstone. Evidence for this is: (1) the character and age of the material making up the dam; (2) evidence of subsurface drainage; (3) the lithologic similarity of the material in the dam only to the Wingate (?) sandstone; (4) prevailing wind direction and intensity; and (5) the presence of active dunes in and near the Tucumcari area.The lake probably will not serve as a satisfactory natural reservoir site because of subsurface drainage through the eolian dam.

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