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Jackson County
Low elevation: <340 feet above mean sea level Place: Big Muddy and Mississippi Rivers 7.5' quadrangle name: Neelys Landing PLSS: 3-11-11S-4W Geology: Cahokia Alluvium in river valley High elevation: ~811 feet above mean sea level Place: Grassy Knob 7.5' quadrangle name: Wolf Lake PLSS: 3-34-10S-3W Geology: Loess hill over Lower Devonian carbonate bedrock Area: 599.01 square miles Total relief (approximate): 417 feet Average percent slope: 2.25%
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| Updated 5/4/2007 JKH | |||