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Big Rock Quadrangle
NOTE: This is not the actual topographic map! This image depicts the area covered by the topographic map and identifies the surrounding maps. If you have additional questions contact the Information Office or call 217-244-0933.
County: DeKalb, Kane
Current Date: 1968
Photo Revision Date: 1975 Archive Date: 1968
| Sycamore | Maple Park | Elburn |
| Hinckley | BIG ROCK | Sugar Grove |
| Somonauk | Plano | Yorkville |
Ordering information for Illinois State Geological Survey Publications.
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