Phanerozoic
Cenozoic
Quaternary
Holocene
Pleistocene
Tertiary
Neogene
Pliocene
Miocene
Paleogene
Oligocene
Eocene
Paleocene
Mesozoic
Cretaceous
Jurassic
Triassic
Paleozoic
Permian
Carboniferous
Pennsylvanian
Mississippian
Devonian
Silurian
Ordovician
Cambrian
Eon
Proterozoic
PreCambrian
PreCambrian
Late Proterozoic
Middle Proterozoic
Early Proterozoic
Algonkian.  The Proterozoic is an Eon, which is a broader term than Era (the PreCambrian).
Archean
PreCambrian
Late Archean
Middle Archean
Early Archean
Cryptozoic, Archaeozoic, Azoic.  The Archean is an Eon, which is a broader term than Era (the PreCambrian).  The Early Archean is projected to 3800? my.  The oldest rock found on Earth is believed to be 4600 my.
Cenozoic
Quaternary
Holocene
Pleistocene
Tertiary
Neogene
Pliocene
Miocene
Paleogene
Oligocene
Eocene
Paleocene
Era
Mesozoic
Cretaceous
Late Cretaceous
Early Cretaceous
Neocomian
Jurassic
Late Jurassic
Middle Jurassic
Early Jurassic
Triassic
Late Triassic
Middle Triassic
Early Triassic
Paleozoic
Permian
Late Permian
Early Permian
Carboniferous
Pennsylvanian
Late Carboniferous
Mississippian
Early Carboniferous
Devonian
Late Devonian
Middle Devonian
Early Devonian
Silurian
Late Silurian
Early Silurian
Ordivician
Late Ordovician
Middle Ordovician
E
Proterozoic
Archean
Proterozoic
Late Proterozoic
Middle Proterozoic
Early Proterozoic
Archean
Late Archean
Middle Archean
Early Archean
Algonkian, Cryptozoic, Archaeozoic, Azoic.  The Proterozoic and Archean are Eons, which is a broader term than Era (the PreCambrian).  The Early Archean is projected to 3800? my.  The oldest rock found on Earth is believed to be 4600 my.
Quaternary
Cenozoic
Phanerozoic
Holocene
Versilian
Postglacial
Neolithic
Mesolithic
Pleistocene
Calabrian
Period
Tertiary
Neogene
Pliocene
Late Pliocene
Piacenzian
Early Pliocene
Zanclean
Miocene
Late Miocene
Messinian
Tortonian
Middle Miocene
Serravallian
Langhian
Early Miocene
Burdigalian
Aquitanian
Paleogene
Oligocene
Late Oligocene
Chattian
Early Oligocene
Rupelian
Eoce
Neogene
Tertiary
Cenozoic
Phanerozoic
Pliocene
Late Pliocene
Piacenzian
Early Pliocene
Zanclean
Miocene
Late Miocene
Messinian
Tortonian
Middle Miocene
Serravallian
Langhian
Early Miocene
Burdigalian
Aquitanian
Paleogene
Oligocene
Late Oligocene
Chattian
Early Oligocene
Rupelian
Eocene
Late Eocene
Priabonian
Middle Eocene
Bartonian
Lutetian
Early Eocene
Ypresian
Paleocene
Late Paleocene
Selandian
Thanetian
Unnamed
Early Paleocene
Danian
Cretaceous
Mesozoic
Phanerozoic
Late Cretaceous
Maastrichtian
Campanian
Santonian
Coniacian
Turonian
Cenomanian
Early Cretaceous
Albian
Aptian
Neocomian
Barremian
Hauterivian
Valanginian
Berriasian
Jurassic
Late Jurassic
Tithonian
Kimmeridgian
Oxfordian
Middle Jurassic
Callovian
Bathonian
Bajocian
Aalenian
Early Jurassic
Toarcian
Pliensbachian
Sinemurian
Hettangian
Triassic
Late Triassic
Norian
Carnian
Middle Triassic
Ladinian
Anisian
Early Triassic
Scythian
Rhaetian, Olenekian, Induan
Permian
Paleozoic
Phanerozoic
Late Permian
Tatarian
Kazanian
Kazanian-Ufimian
Ufimian
Early Permian
Kungurian
Artinskian
Sakmarian
Sakmarian-Asselian
Asseslian
Ufimian-Kazanian
Carboniferous
Pennsylvanian
Late Carboniferous
S.
Gzelian
Gzelian-Kasimovian
Kasimovian
W.
Moscovian
Bashkirian
N.
Mississippian
Early Carboniferous
N.
Serpukhovian
Visean
Tournaisian
Devonian
Late Devonian
Famennian
Frasnian
Middle Devonian
Givetian
Eifelian
Early Devonian
Emsian
Siegenian
Gedinnian
Praghian, Lockhovian
Silurian
Late Silurian
Pridolian
Ludlovian
Early Silurian
Wenlockian
Llandoverian
Ordovician
Late Ordovician
Ashgillian
Caradocian
Middle Ordovician
Llandeilian
Llanvirnian
Early Ordovician
Arenigian
Tremadocian
Cambrian
Late Cambrian
Trempealeauan
Franconian
Dresbachian
Middle Cambrian
Early Cambrian
Sunwaptan, Steptoean, Marjuman, Delamaran, Dyeran, Montezuman, D Cambrian, C Cambrian, B Cambrian, A Cambrian
Holocene
Quaternary
Cenozoic
Phanerozoic
Versilian
Postglacial
Neolithic
Mesolithic
Epoch
Pleistocene
Calabrian
Pliocene
Neogene
Tertiary
Cenozoic
Phanerozoic
Late Pliocene
Piacenzian
Early Pliocene
Zanclean
Miocene
Late Miocene
Messinian
Tortonian
Middle Miocene
Serravallian
Langhian
Early Miocene
Burdigalian
Aquitanian
Oligocene
Paleogene
Tertiary
Cenozoic
Phanerozoic
Late Oligocene
Chattian
Early Oligocene
Rupelian
Eocene
Late Eocene
Priabonian
Middle Eocene
Bartonian
Lutetian
Early Eocene
Ypresian
Paleocene
Late Paleocene
Selandian
Thanetian
Unnamed
Early Paleocene
Danian
Late-Cretaceous
Cretaceous
Mesozoic
Phanerozoic
Maastrichtian
Campanian
Santonian
Coniacian
Turonian
Cenomanian
Early-Cretaceous
Albian
Aptian
Neocomian
Barremian
Hauterivian
Valanginian
Berriasian
Neocomian
Early Cretacous
Cretaceous
Mesozoic
Phanerozoic
Barremian
Hauterivian
Valanginian
Berriasian
Late-Jurassic
Jurassic
Mesozoic
Phanerozoic
Tithonian
Kimmeridgian
Oxfordian
Middle-Jurassic
Callovian
Bathonian
Bajocian
Aalenian
Early-Jurassic
Toarcian
Pliensbachian
Sinemurian
Hettangian
Late-Triassic
Triassic
Mesozoic
Phanerozoic
Norian
Carnian
Rhaetian
Middle-Triassic
Ladinian
Anisian
Early-Triassic
Scythian
Olenekian, Induan
Late-Permian
Permian
Paleozoic
Phanerozoic
Tatarian
Ufimian
Ufimian-Kazanian
Kazanian
Early-Permian
Kungurian
Artinskian
Sakmarian
Sakmarian-Asselian
Asselian
Pennsylvanian
Carboniferous
Paleozoic
Phanerozoic
Late Carboniferous
S.
Gzelian
Gzelian-Kasimovian
Kasimovian
Moscovian
W.
Bashkirian
N.
Mississippian
N.
Carboniferous
Paleozoic
Phanerozoic
N.
Early Carboniferous
Serpukhovian
Visean
Tournaisian
Late-Carboniferous
Pennsylvanian
Carboniferous
Paleozoic
Phanerozoic
Early-Carboniferous
N.
Mississippian
Carboniferous
Paleozoic
Phanerozoic
N.
Serpukhovian
Visean
Tournaisian
Late-Devonian
Devonian
Paleozoic
Phanerozoic
Famennian
Frasnian
Middle-Devonian
Givetian
Eifelian
Early-Devonian
Emsian
Siegenian
Gedinnian
Late-Silurian
Silurian
Paleozoic
Phanerozoic
Pridolian
Ludlovian
Early-Silurian
Wenlockian
Llandoverian
Late-Ordovician
Ordovician
Paleozoic
Phanerozoic
Ashgillian
Caradocian
Middle-Ordovician
Llandeilian
Llanvirnian
Early -Ordovician
Arenigian
Tremadocian
Late-Cambrian
Cambrian
Paleozoic
Phanerozoic
Trempealeauan
Franconian
Dresbachian
Middle-Cambrian
A Cambrian.
Early-Cambrian
Pleistocene
Quaternary
Cenozoic
Phanerozoic
Age
Late-Pliocene
Pliocene
Neogene
Tertiary
Cenozoic
Phanerozoic
Piacenzian
Early-Pliocene
Zanclean
Late Pliocene
Pliocene
Neogene
Tertiary
Cenozoic
Phanerozoic
Early Pliocene
Pliocene
Neogene
Tertiary
Cenozoic
Phanerozoic
Late-Miocene
Miocene
Neogene
Tertiary
Cenozoic
Phanerozoic
Messinian
Tortonian
Middle-Miocene
Serravallian
Langhian
Early-Miocene
Burdigalian
Aquitanian
Late-Oligocene
Oligocene
Paleogene
Tertiary
Cenozoic
Phanerozoic
Chattian
Early-Oligocene
Rupelian
Late-Eocene
Eocene
Paleogene
Tertiary
Cenozoic
Phanerozoic
Priabonian
Middle-Eocene
Bartonian
Lutetian
Early-Eocene
Ypresian
Late-Paleocene
Paleocene
Paleogene
Tertiary
Cenozoic
Phanerozoic
Selandian
Thanetian
Unnamed
Early-Paleocene
Danian
Messinian
Late Miocene
Miocene
Neogene
Tertiary
Cenozoic
Phanerozoic
Tortonian
Serravallian
Middle Miocene
Miocene
Neogene
Tertiary
Cenozoic
Phanerozoic
Langhian
Burdigalian
Early Miocene
Miocene
Neogene
Tertiary
Cenozoic
Phanerozoic
Aquitanian
Late Oligocene
Oligocene
Paleogene
Tertiary
Cenozoic
Phanerozoic
Early Oligocene
Oligocene
Paleogene
Tertiary
Cenozoic
Phanerozoic
Late Eocene
Eocene
Paleogene
Tertiary
Cenozoic
Phanerozoic
Bartonian
Middle Eocene
Eocene
Paleogene
Tertiary
Cenozoic
Phanerozoic
Lutetian
Early Eocene
Eocene
Paleogene
Tertiary
Cenozoic
Phanerozoic
Thanetian
Selandian
Late Paleocene
Paleocene
Paleogene
Tertiary
Cenozoic
Phanerozoic
Unnamed
Selandian
Early Paleocene
Paleocene
Paleogene
Tertiary
Cenozoic
Phanerozoic
Maastrichtian
Late Cretaceous
Cretaceous
Mesozoic
Phanerozoic
alternate spelling:  Maestrichtian
Campanian
Santonian
Coniacian
Turonian
Cenomanian
Albian
Early Cretaceous
Cretaceous
Mesozoic
Phanerozoic
Aptian
Barremian
Neocomian
Early Cretaceous
Cretaceous
Mesozoic
Phanerozoic
Hauterivian
Valanginian
Berriasian
Tithonian
Late Jurassic
Jurassic
Mesozoic
Phanerozoic
Kimmeridgian
Oxfordian
Callovian
Middle Jurassic
Jurassic
Mesozoic
Phanerozoic
Bathonian
Bajocian
Aalenian
Toarcian
Early Jurassic
Jurassic
Mesozoic
Phanerozoic
Pliensbachian
Sinemurian
Hettangian
Norian
Late Triassic
Triassic
Mesozoic
Phanerozoic
Carnian
Ladinian
Middle Triassic
Triassic
Mesozoic
Phanerozoic
Anisian
Early Triassic
Triassic
Mesozoic
Phanerozoic
Tatarian
Late Permian
Permian
Paleozoic
Phanerozoic
Kazanian-Ufimian
Kazanian
Ufimian
Ufimian-Kazanian.  The two terms are lumped together as the same age with stratigraphic relativity.
Kungurian
Early Permian
Permian
Paleozoic
Phanerozoic
Artinskian
Sakmarian-Asselian
Sakmarian
Asselian
The two terms are lumped together as the same age with stratigraphic relativity.
Gzelian-Kasimovian
S.
Late Carboniferous
Pennsylvanian
Carboniferous
Paleozoic
Phanerozoic
S.
Gzelian
Kasimovian
S.
Gzelian
Gzelian-Kasimovian
Kasimovian
Moscovian
Late Carboniferous
Pennsylvanian
Carboniferous
Paleozoic
Phanerozoic
Gzelian
Kasimovian
Gzelian, Kasimovian, Moscovian
Moscovian
S.
W.
Late Carboniferous
Pennsylvanian
Carboniferous
Paleozoic
Phanerozoic
S.
W.
The Minimum and Maximum Ages are approximate and were not listed on the source.
Bashkirian
W.
N.
Late Carboniferous
Pennsylvanian
Carboniferous
Paleozoic
Phanerozoic
W.
N.
The Minimum Age is approximate and was not listed on the source.
Serpukhovian
Early Carboniferous
Mississippian
N.
Carboniferous
Paleozoic
Phanerozoic
N.
Visean
Early Carboniferous
Mississippian
Carboniferous
Paleozoic
Phanerozoic
Tournaisian
Famennian
Late Devonian
Devonian
Paleozoic
Phanerozoic
Frasnian
Givetian
Middle Devonian
Devonian
Paleozoic
Phanerozoic
Eifelian
Emsian
Early Devonian
Devonian
Paleozoic
Phanerozoic
Siegenian
Praghian
Pridolian
Late Silurian
Silurian
Paleozoic
Phanerozoic
Ludlovian
Wenlockian
Early Silurian
Silurian
Paleozoic
Phanerozoic
Llandoverian
Ashgillian
Late Ordovician
Ordovician
Paleozoic
Phanerozoic
Caradocian
Llandeilian
Middle Ordovician
Ordovician
Paleozoic
Phanerozoic
Llanvirnian
Arenigian
Early Ordovician
Ordovician
Paleozoic
Phanerozoic
Tremadocian
Late Paleocene
Paleocene
Paleogene
Tertiary
Cenozoic
Phanerozoic
Thanetian
Unnamed
W.
Moscovian
Bashkirian
Late Carboniferous
Pennsylvanian
Carboniferous
Paleozoic
Phanerozoic
Moscovian
Bashkirian
Serpukhovian
Early Carboniferous
Mississippian
Bashkirian
Late Carboniferous
Pennsylvanian
Carboniferous
Paleozoic
Phanerozoic
Bashkirian
Serpukhovian
Kazanian
Ufimian
The Ufimian is lumped with the Kazanian as the same age and is stratigraphically older.
The Kazanian is lumped with the Ufimian as the same age and is stratigraphically younger.
Sakmarian
Asselian
The Sakmarin is lumped with the Asselian as the same age and is stratigraphically younger.
The Asselian is lumped with the Sakmarian as the same age and is stratigraphically older.
Gzelian
S.
Kasimovian
The Gzelian is lumped with the Kasimovian as the same age and is stratigraphically younger.
Gedinnian
Lockhovian
Trempealeauan-Franconian-Dresbachian
Late Cambrian
Cambrian
Paleozoic
Phanerozoic
Sunwaptan, Steptoean, Marjuman, Delamaran, Dyeran, Montezuman, D Cambrian, C Cambrian, B Cambrian.  The Maximum Age is approximate and was not listed on the source.  All units are lumped as one age; listed stratigraphically relative.
Trempealeauan
Franconian
Dresbachian
Sunwaptan, Steptoean, Marjuman, Delamaran, Dyeran, Montezuman, D-C-B Cambrians.  The Maximum Age is approximate and was not listed on the source.  All units are lumped as one age; Trempealeauan stratigraphically youngest.
Franconian
Trempealeauan
Dresbachian
Sunwaptan, Steptoean, Marjuman, Delamaran, Dyeran, Montezuman, D-C-B Cambrians.  The Maximum Age is approximate.  All units are lumped as one age; Franconian younger than Dresbachian, older than Trempealeauan.
Dresbachian
Trempealeauan
Franconian
Sunwaptan, Steptoean, Marjuman, Delamaran, Dyeran, Montezuman, D-C-B Cambrians.  The Maximum Age is approximate and was not listed on the source.  All units are lumped as one age; Dresbachian stratigraphically the oldest.
Late-Proterozoic
Proterozoic
PreCambrian
Middle-Proterozoic
Late-Middle-Proterozoic
Middle-Middle-Proterozoic
Early-Middle-Proterozoic
Early-Proterozoic
Late-Archean
Archean
PreCambrian
Middle-Archean
Early-Archean
The Early Archean is projected to 3800? my.  The oldest rock found on Earth is believed to be 4600 my.
Carboniferous-Pennsylvanian
Carboniferous-Mississippian
Late-Middle-Proterozoic
Proterozoic
PreCambrian
Middle-Proterozic
Middle-Middle-Proterozoic
Early-Middle-Proterozoic
Late-Early-Proterozoic
Proterozoic
PreCambrian
Early-Proterozic
Middle-Early-Proterozoic
Early-Early-Proterozoic
Early-Cretaceous-Neocomian
Neocomian
Barremian
Hauterivian
Valanginian
Berriasian
Tertiary-Neogene
Tertiary-Paleogene