Key: White, Grey and Black
- Mainly Marine Stratified Sequences
- Q Quaternary
- Limits of Pleistocene glacial deposits
- PP4 Virgilian Series (Pennsylvanian)
- PP3 Missourian Series (Pennsylvanian)
- PP2 Des Moinesian Series (Pennsylvanian)
- PP1a Arnkan and Morrowan Series, Jackson Sandstone (pennsylvanian)
- uPz Upper Paleozoic clastic wedge sequence
- Volcanic Rocks
- Qv Quaternary volcanic rocks
- Qf Quaternary felsic volcanic rocks
- Intrusive Rocks
- Pzg3 Upper Paleozoic granitic rocks
- Metamorphic Rocks
- Phanerozoic metamorphic rocks