| Alluvium on Floodplains |
| Alluvium on Low Terraces |
| Alluvium on Uplands and Terraces |
| Organic Materials |
| Deep Loess / Deep Silty Sediments |
| Eolian Sands / Sandy Sediments |
| Clayey and Silty Lacustrine Deposits |
| Pre-Illinoian Till |
| Pre-Illinoian Outwash |
| Clayey Fluvio-Deltaic Coastal Sediments |
| Sandy Fluvio-Deltaic Coastal Sediments |
| Gravelly Fluvio-Deltaic Coastal Sediments |
| Residuum from Carbonate Rocks |
| Residuum from Calcareous Clastic Rocks |
| Residuum from Acid Clastic Rocks |
| Residuum from Basic/Mafic Igneous or Metamorphic Rocks |
| Residuum from Acid/Silicic Igneous or Metamorphic Rocks |
| Colluvium from Carbonate Rocks |
| Colluvium from Acid Clastic Rocks |
| Colluvium from Various Sources |
| Disturbed Areas / Urban Land / Mining Regolith / Pits |
| Water |