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SITE GEOLOGY AND GROUNDWATER <br />The surficial geology consists primarily of terraces - areas that were once the river channel <br />or floodplains carved by the torrential flow of the Glacial River Warren in the Pleistocene <br />epoch. These occur above current floodplain areas but below nearby moraine or outwash <br />areas. The property itself is located within the Mississippi Sand Plain (Figure 4). <br />These terraces are principally sand, gravel, and some finer materials, especially along the <br />Mississippi and its smaller tributaries (Hobbs and Goebel 1982). In and around the <br />Conservation Area, the depth from surface to bedrock is roughly 200 fee Olsen and <br />Mossler 1982). <br />Throughout the site, the depth to groundwater ranges from 15 <br />shallow. Groundwater flows to the south/southeast across they <br />of the confluence of the Elk and Mississippi Rivers. ` <br />which is quite <br />k in the direction <br />Friends of the Mississippi <br />15 <br />W.H. Houlton Conservation Area NRMP <br />