Key: Pink and Purple

• Mainly Marine Stratified Sequences
  • PP Pennsylvanian
  • O3 Upper Ordovician (Cincinnatian)
  • O2 Middle Ordovician (Mohawkian)
  • O1, O1b, O1a Lower Ordovician (Canadian)
  • O Ordovician
  • lPz Lower Paleozoic
  • OC Cambrian-Ordovician
• Eugeosynclinal Deposits
  • DSe Devonian and Silurian
  • SOe Silurian and Ordovician
  • Oe Ordovician
  • Ce Cambrian
• Volcanic Rocks
  • Dv Devonian volcanic rocks
  • DSe Devonian and Silurian
  • Ov Ordovician volcanic rocks
  • Cv Cambrian volcanic rocks
• Intrusive Rocks
  • Pzg1 Lower Paleozoic granitic rocks
  • Cg Cambrian granitic rocks