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