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Legend (NCRDS/CoalByAge)

Coal Fields by Age (0)
Tertiary Tertiary
Tertiary-Cretaceous Tertiary-Cretaceous
Cretaceous Cretaceous
Cretaceous-Jurassic Cretaceous-Jurassic
Triassic Triassic
Pennsylvanian-Permian Pennsylvanian-Permian
Mississippian Mississippian