Key: Blue

• Mainly Marine Stratified Sequences
  • P4 Oehoan Series (Permian)
  • P3b Upper part of Guadalupian Series (Permian)
  • P3a Lower part of Guadalupian Series (Permian)
  • P3 Guadalupian Series (Permian)
  • P2b Upper part of Leonardian Series (Permian)
  • P2a Lower part of Leonardian Series (Permian)
  • P1 Wolfcampian Series (Permian)
  • P Permian
  • M3 Chesterian Series (Mississippian)
  • M2 Merantecian Series (Mississippian)
  • M1 Osagean and Kinderkookian Series (Mississippian)
  • M Mississippian
  • D3 Upper Devonian
  • D2 Middle Devonian
  • D1 Lower Devonian
  • D Devonian
  • S3 Upper Silurian (Cayugan)
  • S2 Middle Silurian (Niagaran)
  • S1 Lower Silurian (Alexandrian)
  • DS Devonian and Silurian
  • S Silurian
• Continental Deposits
  • P2ac Early Leonardian (Pennsylvanian)
  • P1c Wolfcampian Series (Pennsylvanian)
  • D3c Upper Devonian
  • D2c Middle Devonian
• Eugeosynclinal Deposits
  • TrPe Triassic to Permian
  • Pe Permian
  • uPze Upper Paleozoic
  • De Devonian
  • Se Silurian
  • lPze Lower Paleozoic
• Volcanic Rocks
  • DSv Devonian and Silurian volcanic rocks
  • Sv Silurian volcanic rocks
• Intrusive Rocks
  • Pzg2 Middle Paleozoic granitic rocks
  • Pzmi Phanerozoic mafic intrusives