Pleistocene
Pliocene
Cretaceous Continental Deposits
Tertiary Continental Deposits
Tertiary and Cretacous Continental Deposits
Cenozoic to Precambrian Undifferentiated Rocks
Ice
Water
Cambrian
Cretaceous and Jurassic
Cretaceous
Devonian and Silurian
Devonian
Holocene
Jurassic and or Triassic
Jurassic
Jurassic to Mississippian
Jurassic, Triassic, and Permian
Mesozoic and Paleozoic
Miocene
Mississippian and or Devonian
Mississippian
Oligocene
Ordovician
Ordovician, Cambrian, and Precambrian
Paleozoic and or Precambrian
Paleozoic
Pennsylvanian and Mississippian
Pennsylvanian
Permian and Pennsylvanian
Permian
Late Proterozoic
Quaternary
Silurian and Ordovician
Silurian
Tertiary
Triassic and Permian
Triassic
Triassic to Devonian