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(doloir~itic limestone) make up the major aquifer system in the twin Cities. The St. Peter Sandstone <br />overlies the Prairie du Chien Group in some locations and in a few location (such as in Minneapolis), <br />the Platteville Formation is the uppermost bedrock. <br />2.2 Geologic Conditions in the Elk River Area <br />Elk River is located near the western edge of the Hollandai;. Embayment. Many of the bedrock units <br />that are present beneath Minneapolis and St. Paul are not preser.~ underneath Elk River (either they <br />were never deposited or were. long ago eroded awayl. A few miles west of Elk River, even the Mt. <br />Simon and Hinckley Formations are not present. <br />P:\Mpls\23 MN\71\2371105 Water Supply AL'ernative Study~FinalDelzverab[es\Alternati:es_Report_fina!.doc 7 <br />Figure 3 Uppermost Bedrock in the Vicinity of Elk River <br />