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SYSTEM GEOLOGIC UNIT THICKNESS LITHOLOGY <br /> (Feet) <br /> <br />Alluvium <br />0-150 •. ~ • o <br />' •'°:~' ~' ~=~'• <br />~Qi. <br />i <br />%o <br />?• w: <br />: <br />~ <br />• <br />L a <br />' <br />• <br />° <br />(p <br />C + <br />• <br />s a <br />a <br />•°a a••• <br />a <br />a • <br />L <br /> <br />~ <br />+-' <br /> <br /> <br /> <br />lacial Drift <br /> <br /> <br /> <br />-400 • <br />• <br />• <br />•• •a <br />a aa••a a•a•a•a s <br />• ' <br />' <br />' <br />~ <br />~ • <br />a•a . a• a•a <br />as a••a•a > . <br />• <br />• <br />O~ . <br />. a <br />. a <br />•a•• • • a - <br />a•a a <br /> Decorah Shaie 0-95 -~-~=~:' _ <br />=~'_ -- - <br /> Plattevitle Limestone 30-50 <br /> <br />~ St. Peter Sandstone 140-160 <br />v <br /> <br />0 <br />~ Shakopee Dolomite 35-60 <br /> <br />0 <br /> New Richmond Sandstone 0-10 <br /> <br /> <br /> <br /> Oneota Dolomite 70-90 <br /> <br /> <br /> Jordan Sandstone 80-105 <br /> <br /> <br />F <br />ti <br />S <br />L <br /> <br />0 <br />- y--~ z <br />.z=~: ~-- <br />~~ <br /> orma <br />on <br />awrence <br />t. 35 <br />7 -~-~.- - - <br />~~-~~ - <br />~ Franconia Sandstone 100-200 <br /> <br />e <br />~ Ironton - Galesville <br /> Sandstones <br /> Eau Claire Formation 250-400 -i ~' <br /> Mount Simon Sandstone <br />Precam- <br /> <br />Brian Hinckley Sandstone t <br />75- 75 <br />SOURCE: United States Geological Survey <br />_~ <br />Decorah- <br />Piatteville <br />Aquifer <br />St. Peter Aquifer <br />Prairie Du Chien- <br />Jordan Aquifer <br />Franconia- <br />Galesville <br />Aquifer <br />Mount Simon- <br />Hinckley Aquifer <br />Figure 2 <br />GEOLOGIC COLUMN <br />