Stratigraphic Column for Illinois

• Deepest porous units in Cambrian

  • Mt Simon SS Gas Storage

• Ordovician porous strata

  • St Peter Gas Storage
  • Trenton/Galena Carbonate Oil Fields

• Silurian/Devonian

  • Hunton Megagroup carbonate oil reservoirs

• Mississippian

  • Valmeyeran carbonates
  • Chesterian Sandstone

• Pennsylvanian coal seams

  • Herrin
  • Springfield
  • Danville

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