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Morgan County Low elevation: <430 feet above mean sea level Place: Illinois River 7.5' quadrangle name: Meredosia PLSS: 3-32-16N-13W Geology: Cahokia Alluvium in river valley High elevation: >705 feet above mean sea level Places: 2 unnamed hilltops 7.5' quadrangle names: Alexander and Jacksonville PLSS: 3-23-14N-9W and 3-30-14N-9W Geology: Vandalia till uplands over Pennsylvanian Modesto Formation Area: 566.72 square miles Total relief (approximate): 275 feet Average percent slope: 0.92%
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| Updated 5/7/2007 JKH | |||||