| Des Moines Lobe Sand and Gravel > 20 ft thick, poor to moderate quality (Class 2) |
| Des Moines Lobe Sand and Gravel > 20 ft thick, moderate to good quality (Class 3) |
| Superior Lobe Sand and Gravel > 20 ft thick, good to excellent quality (Class 4) |
| Des Moines Lobe Sand and Gravel 10-40 ft thick, poor to moderate quality (Class 5) |
| Des Moines Lobe Sand and Gravel 10-40 ft thick, moderate to good quality (Class 6) |
| Superior Lobe Sand and Gravel 10-40 ft thick, good to excellent quality (Class 7) |
| Des Moines Lobe Sand and Gravel > 40 ft thick, moderate to good quality (Class 10) |
| Superior Lobe Sand and Gravel > 40 ft thick, good to excellent quality (Class 11) |
| Prairie du Chien Dolostone > 30 ft thick (Class A) |
| Prairie du Chien Dolostone > 10 < 30 ft thick (Class B) |
| Prairie du Chien dolostone < 10 ft thick (Class C) |