Water Supply and Irrigation Papers of the United States Geological Survey . of the Statethey can not average more than 75 feet and in the eastern half they are50 feet thick outside the so-called driftless area of the south-eastern corner. The glacial drift affords waters through three distinctmethods—artesian wells, shallow wells, and springs. ARTESIAN BASINS. The artesian basins of Minnesota may be briefly described as the(1) Southeastern artesian basin, (2) Red River Valley basin, and (3)small local basins. Southeastern artesian basin.—This basin is within the area of the MINNESOTA. 229 pre-
Water Supply and Irrigation Papers of the United States Geological Survey . of the Statethey can not average more than 75 feet and in the eastern half they are50 feet thick outside the so-called driftless area of the south-eastern corner. The glacial drift affords waters through three distinctmethods—artesian wells, shallow wells, and springs. ARTESIAN BASINS. The artesian basins of Minnesota may be briefly described as the(1) Southeastern artesian basin, (2) Red River Valley basin, and (3)small local basins. Southeastern artesian basin.—This basin is within the area of the MINNESOTA. 229 pre-Paleozoic rocks. Each one of the several sandstones in the serieswill yield water wherever it is present under the necessary pre-Paleozoic rocks are in the form of a great arch or dome, thecrest of which seems to lie in Rice, Goodhue, and Dakota this dome the Trenton limestone is worn away and the sandstone has been subjected to erosion almost sufficient to severits southern from its northern area. The lowermost of the sandstone. Fig 35.—Artesian basins of Minnesota. series in this region seems to have a great thickening beneath Minne-apolis and St. Paul. A well sunk in Lakewood Cemetery, Minne-apolis (elevation 975 feet), disclosed granitic rocks 2,150 feet belowthe surface. Along the southern border of the State at Winona,Brownsville, and also La Crosse, Wis., granitic rocks were struckat about 525 feet below the level of the Mississippi, where the surfacealtitude was 625 feet. Since granitic rocks occur at St. Cloud at 1,200 230 UNDERGROUND WATERS, EASTERN UNITED STATES. [no. 114. feet above sea level the basin-shaped nature of the bottom of thiswater-bearing district is clearly seen. The Southeastern artes;an basin lies within the portion of the Statefirst settled. The population within this region is comparatively dense,being, it is estimated, about 100 per square mile. Several towns andmany farmers get their principal water supp
Size: 1506px × 1659px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorunitedst, bookcentury1900, bookdecade1900, bookyear1905
