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Marshall County
Low elevation: <465 feet above mean sea level Place: Illinois River 7.5' quadrangle name: Chillicothe PLSS: 3-32-29N-3W Geology: Cahokia Alluvium in river valley High elevation: >895 feet above mean sea level Place: Unnamed hilltop 7.5' quadrangle name: La Prairie Center PLSS: 4-32-13N-8E Geology: Providence Moraine Area: 395.01 square miles Total relief (approximate): 430 feet Average percent slope: 1.47%
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| Updated 5/4/2007 JKH | |||||