Water Supply and Irrigation Papers of the United States Geological Survey . ^ the advance of the sea duringCretaceous time. At any rate, no traces of soil are now found upon 1 Sixteenth Ann. Rept. Geol. Nat. Hist. Survey Minnesota. SURVEY HTJTCHllKSOiNr CO. W \ W !. GEOLOGICAL MAP OF A POKTI ALGONKIAN CRETACEOUS LE * T SIOUX OUARTZITE DAKOTAFORMATION COLORADO FORMATION MO Numl WATER-SUPPLY PAPER N? 34

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