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Marion County
Low elevation: <420 feet above mean sea level
Place: Skillet Fork
7.5' quadrangle name: Shields
PLSS: 3-36-1N-4E
Geology: Equality Formation, Carmi Member; lake bottom sediment in river valley
High elevation: >650 feet above mean sea level
Place: Unnamed hilltop
7.5' quadrangle name: Kinmundy
PLSS: 3-26 and 27-4N-3E
Geology: Hagarstown ridge
Area: 569.69 square miles
Total relief (approximate): 230 feet
Average percent slope: 0.84%
State of Illinois | Illinois Department of Natural Resources | University of Illinois