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Bohling, Geoffrey C. / A ground penetrating radar study of water table elevation in a portion of Wisconsin's central sand plain
[DNR-050] (1988)

II. Geology and hydrogeology of the study area,   pp. 10-18 PDF (1.9 MB)


Page 10

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II. GEOLOGY AND HYDROGEOLOGY OF THE STUDY AREA
A. Introduction
Deposits of glacial outwash sand approximately 70 feet thick overlie
nearly impermeable crystalline bedrock over most of the study area.
Apparently some sandstone overlies the crystalline bedrock and underlies
the outwash in the northern portion of the study area (Kraft, in prepara-
tion). The thickness and hydraulic properties of the glacial sediments
influence the distribution of recharge in the area.
B. Elevation and Nature of Bedrock
In an east-west cross section through the study area, approximately
along the line of Forest Drive (Figure 2), Clayton (1986, Plate 2) shows
Precambrian crystalline bedrock underlying the outwash sediments. He
shows the top of the bedrock sloping from about 1010 feet above sea level
at the western end of the study area (beneath Love Creek) to about 980
feet above sea level at the eastern end of the study area. This bedrock
can be considered practically impermeable relative to the highly permeable
glacial outwash sands. Clayton also shows about eight feet of " older
hillslope deposits"  overlying the Precambrian rock. These deposits are
derived from the Precambrian rock and contain 3 to 35 percent clay-sized
particles (Clayton, 1986, p. 3). Since this clayey residuum should also be
considerably less permeable than the overlying sands, the top of the


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