| Silurian- and Devonian-age carbonate bedrock overlain by less than 20 feet of glacial drift and/or alluvium |
| Silurian- and Devonian-age carbonate bedrock overlain by more than 20 feet of glacial drift and/or alluvium |
| Interbedded Ordovician-age limestone and shale overlain by less than 20 feet of glacial drift and/or alluvium |
| Interbedded Ordovician-age limestone and shale overlain by more than 20 feet of glacial drift and/or alluvium |
