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  • Cenozoic Erathem
    • Quaternary
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  • Mesozoic
  • Cretaceous
  • Paleozoic‏‎
  • Pennsylvanian
  • Mississippian System
  • Devonian System‏‎
  • Silurian System‏‎
  • Ordovician‏‎
  • Cambrian