| I - Thin drift (0-30 feet) overlying bedrock |
| II - Drift generally not an aquifer, may include thin interbeded aquifers at depth |
| IIIa - Drift usually unconfined at or near surface, generally consists of interbedded aquifers, aquicludes, and aquitards at depth |
| IIIa - Drift usually unconfined at or near surface, generally consists of interbedded aquifers, aquicludes, and aquitards at depth, BUT DRIFT MAY NOT BE AN AQUIFER IN SMALL DISCONTINUOUS AREAS |
| IIIb - Drift may or may not be aquifer at or near the surface. Drift generally consists of interbedded aquifers, aquicludes, BUT DRIFT MAY NOT BE AN AQUIFER IN SMALL DISCONTINUOUS AREAS |
| IIIb - Drift may or may not be aquifer at or near the surface. Drift generally consists of interbedded aquifers, aquicludes, and aquitards at depth |
| IIIb - Drift may or may not be aquifer at or near the surface. Drift generally consists of interbedded aquifers, aquicludes, and aquitards at depth, BUT DRIFT MAY NOT BE AN AQUIFER IN SMALL DISCONTINUOUS AREAS |
| IV - Drift may be an unconfined aquifer to bedrock. Not possible to delinate from available data. |
| Artificial fill |
| Coarse-textured glacial till |
| Dune sand |
| End moraines of coarse-textured till |
| End moraines of fine-textured till |
| End moraines of medium-textured till |
| Exposed bedrock surfaces |
| Fine-textured glacial till |
| Glacial outwash sand and gravel and postglacial alluvium |
| Ice-contact outwash sand and gravel |
| Lacustrine clay and silt |
| Lacustrine sand and gravel |
| Medium-textured glacial till |
| Peat and muck |
| Postglacial alluvium |
| Thin to discontinuous glacial till over bedrock |
| Water |
| <all other values> |