| Key | ||
| X-Axis | UTM Zone 16 horizontal grid value. | |
| Y-Axis | UTM Zone 16 vertical grid value. | |
| Z-Axis | Elevation above MSL in feet. | |
| Vertical Exaggeration | 5 | |
| Cahokia Alluvium | Yellow | |
| Peoria Silt | Purple | |
| Wisconsin Till | Green | |
| Illinois Till | Orange | |
| Bedrock | Blue | |