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McDonough County Low elevation: <500 feet above mean sea level Place: Camp Grindstone Creek 7.5' quadrangle name: Fandon PLSS: 4-36-15S-4W Geology: Cahokia Alluvium in river valley High elevation: >800 feet above mean sea level Place: Unnamed hilltop 7.5' quadrangle name: Raritan PLSS: 4-7-7N-3W Geology: Thin Illinois Kellerville till over Pennsylvanian Carbondale Formation Area: 583.92 square miles Total relief (approximate): 300 feet Average percent slope: 1.13%
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| Updated 5/7/2007 JKH | |||||