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Figure 2.2 — Soils Classification Map <br />Soils Classification 5� r <br />iUnclassified <br />A Fd, <br />xi <br />A/D View <br />B _ .► �a r <br />B/DFL <br />nil <br />D <br />2.4 GEOLOGY <br />The geology of the region surrounding Mounds View is the result of two different geologic processes: <br />(1) Warm, shallow seas covered the area and created conditions for the formation of sedimentary rocks. <br />These formations are present as bedrock in the area. (2) Glacial processes have resulted in the <br />development of surficial geology and, therefore, current landforms. <br />The City's geology is generally ranges from 150 to 300 feet of glacial till and outwash overlying <br />sedimentary bedrock. The bedrock units beneath the City are marine sedimentary rocks primarily of the <br />Upper Cambrian to Middle Ordovician ages (450 to 500f million years old). Ranging from deeper/older <br />bedrock to relatively shallow/young bedrock, the specific geologic units include the St. <br />Lawrence/Franconia formation, Jordan Sandstone, and the Prairie du Chien group. <br />Glacial influence on this area began around 2.5 million years ago and continued until about 10,000 years <br />ago. However, the last episode of glaciation created the present landscape features in this area and <br />across Minnesota. This episode lasted from about 35,000 to about 10,000 years ago. Two major glacial <br />ice sheet movements constituted this episode during what is known as the late Wisconsinan glaciation. <br />The first, the Superior lobe, advanced from the north. The second, the Grantsburg sublobe, advanced <br />from the southwest. <br />City of Mounds View 5 <br />Local Surface Water Management Plan Stantec Project No. 193804166 <br />(5 5tantec <br />