TIME,BROADER,NARROWER,SUGGESTION,CLASSIFICA,MIN_AGE,MAX_AGE 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,0,570 Cenozoic,Phanerozoic,Quaternary Holocene Pleistocene Tertiary Neogene Pliocene Miocene Paleogene Oligocene Eocene Paleocene,,Era,0,66.4 Quaternary,Cenozoic Phanerozoic,Holocene Versilian Postglacial Neolithic Mesolithic Pleistocene Calabrian,,Period,0,1.6 Holocene,Quaternary Cenozoic Phanerozoic,Versilian Postglacial Neolithic Mesolithic,,Epoch,0,0.01 Pleistocene,Quaternary Cenozoic Phanerozoic,Calabrian,,Epoch,0.01,1.6 Calabrian,Pleistocene Quaternary Cenozoic Phanerozoic,,,Age,0.01,1.6 Tertiary,Cenozoic Phanerozoic,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 Eocene Late Eocene Priabonian Middle Eocene Bartonian Lutetian Early Eocene Ypresian Paleocene Late Paleocene Selandian Thanetian Unnamed Early Paleocene Danian,,Period,1.6,66.4 Neogene,Tertiary Cenozoic Phanerozoic,Pliocene Late Pliocene Piacenzian Early Pliocene Zanclean Miocene Late Miocene Messinian Tortonian Middle Miocene Serravallian Langhian Early Miocene Burdigalian Aquitanian,,Period,1.6,23.7 Tertiary-Neogene,Cenozoic Phanerozoic,Pliocene Late Pliocene Piacenzian Early Pliocene Zanclean Miocene Late Miocene Messinian Tortonian Middle Miocene Serravallian Langhian Early Miocene Burdigalian Aquitanian ,,Period,1.6,23.7 Pliocene,Neogene Tertiary Cenozoic Phanerozoic,Late Pliocene Piacenzian Early Pliocene Zanclean,,Epoch,1.6,5.3 Late-Pliocene,Pliocene Neogene Tertiary Cenozoic Phanerozoic,Piacenzian,,Epoch,1.6,3.4 Piacenzian,Late Pliocene Pliocene Neogene Tertiary Cenozoic Phanerozoic,,,Age,1.6,3.4 Early-Pliocene,Pliocene Neogene Tertiary Cenozoic Phanerozoic,Zanclean,,Epoch,3.4,5.3 Zanclean,Early Pliocene Pliocene Neogene Tertiary Cenozoic Phanerozoic,,,Age,3.4,5.3 Miocene,Neogene Tertiary Cenozoic Phanerozoic,Late Miocene Messinian Tortonian Middle Miocene Serravallian Langhian Early Miocene Burdigalian Aquitanian,,Epoch,5.3,23.7 Late-Miocene,Miocene Neogene Tertiary Cenozoic Phanerozoic,Messinian Tortonian,,Epoch,5.3,11.2 Messinian,Late Miocene Miocene Neogene Tertiary Cenozoic Phanerozoic,,,Age,5.3,6.5 Tortonian,Late Miocene Miocene Neogene Tertiary Cenozoic Phanerozoic,,,Age,6.5,11.2 Middle-Miocene,Miocene Neogene Tertiary Cenozoic Phanerozoic,Serravallian Langhian,,Epoch,11.2,16.6 Serravallian,Middle Miocene Miocene Neogene Tertiary Cenozoic Phanerozoic ,,,Age,11.2,15.1 Langhian,Middle Miocene Miocene Neogene Tertiary Cenozoic Phanerozoic,,,Age,15.1,16.6 Early-Miocene,Miocene Neogene Tertiary Cenozoic Phanerozoic,Burdigalian Aquitanian,,Epoch,16.6,23.7 Burdigalian,Early Miocene Miocene Neogene Tertiary Cenozoic Phanerozoic,,,Age,16.6,21.8 Aquitanian,Early Miocene Miocene Neogene Tertiary Cenozoic Phanerozoic,,,Age,21.8,23.7 Paleogene,Tertiary Cenozoic Phanerozoic,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,,Period,23.7,66.4 Tertiary-Paleogene,Cenozoic Phanerozoic,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,,Period,23.7,66.4 Oligocene,Paleogene Tertiary Cenozoic Phanerozoic,Late Oligocene Chattian Early Oligocene Rupelian,,Epoch,23.7,36.6 Late-Oligocene,Oligocene Paleogene Tertiary Cenozoic Phanerozoic,Chattian,,Epoch,23.7,30 Chattian,Late Oligocene Oligocene Paleogene Tertiary Cenozoic Phanerozoic,,,Age,23.7,30 Early-Oligocene,Oligocene Paleogene Tertiary Cenozoic Phanerozoic,Rupelian,,Epoch,30,36.6 Rupelian,Early Oligocene Oligocene Paleogene Tertiary Cenozoic Phanerozoic,,,Age,30,36.6 Eocene,Paleogene Tertiary Cenozoic Phanerozoic,Late Eocene Priabonian Middle Eocene Bartonian Lutetian Early Eocene Ypresian,,Epoch,36.6,57.8 Late-Eocene,Eocene Paleogene Tertiary Cenozoic Phanerozoic,Priabonian,,Epoch,36.6,40 Priabonian,Late Eocene Eocene Paleogene Tertiary Cenozoic Phanerozoic,,,Age,36.6,40 Middle-Eocene,Eocene Paleogene Tertiary Cenozoic Phanerozoic,Bartonian Lutetian,,Epoch,40,52 Bartonian,Middle Eocene Eocene Paleogene Tertiary Cenozoic Phanerozoic,,,Age,40,43.6 Lutetian,Middle Eocene Eocene Paleogene Tertiary Cenozoic Phanerozoic,,,Age,43.6,52 Early-Eocene,Eocene Paleogene Tertiary Cenozoic Phanerozoic,Ypresian,,Epoch,52,57.8 Ypresian,Early Eocene Eocene Paleogene Tertiary Cenozoic Phanerozoic,,,Age,52,57.8 Paleocene,Paleogene Tertiary Cenozoic Phanerozoic,Late Paleocene Selandian Thanetian Unnamed Early Paleocene Danian,,Epoch,57.8,66.4 Late-Paleocene,Paleocene Paleogene Tertiary Cenozoic Phanerozoic,Selandian Thanetian Unnamed,,Epoch,57.8,63.6 Selandian,Late Paleocene Paleocene Paleogene Tertiary Cenozoic Phanerozoic,Thanetian Unnamed,,Age,57.8,63.6 Thanetian,Selandian Late Paleocene Paleocene Paleogene Tertiary Cenozoic Phanerozoic,,,Age,57.8,60.6 Unnamed,Selandian Late Paleocene Paleocene Paleogene Tertiary Cenozoic Phanerozoic,,Selandian,Age,60.6,63.6 Early-Paleocene,Paleocene Paleogene Tertiary Cenozoic Phanerozoic,Danian,,Epoch,63.6,66.4 Danian,Early Paleocene Paleocene Paleogene Tertiary Cenozoic Phanerozoic,,,Age,63.6,66.4 Mesozoic,Phanerozoic,Cretaceous Late Cretaceous Early Cretaceous Neocomian Jurassic Late Jurassic Middle Jurassic Early Jurassic Triassic Late Triassic Middle Triassic Early Triassic,,Era,66.4,245 Cretaceous,Mesozoic Phanerozoic,Late Cretaceous Maastrichtian Campanian Santonian Coniacian Turonian Cenomanian Early Cretaceous Albian Aptian Neocomian Barremian Hauterivian Valanginian Berriasian,,Period,66.4,144 Late-Cretaceous,Cretaceous Mesozoic Phanerozoic,Maastrichtian Campanian Santonian Coniacian Turonian Cenomanian,,Epoch,66.4,97.5 Maastrichtian,Late Cretaceous Cretaceous Mesozoic Phanerozoic,,alternate spelling: Maestrichtian,Age,66.4,74.5 Campanian,Late Cretaceous Cretaceous Mesozoic Phanerozoic,,,Age,74.5,84 Santonian,Late Cretaceous Cretaceous Mesozoic Phanerozoic,,,Age,84,87.5 Coniacian,Late Cretaceous Cretaceous Mesozoic Phanerozoic,,,Age,87.5,88.5 Turonian,Late Cretaceous Cretaceous Mesozoic Phanerozoic,,,Age,88.5,91 Cenomanian,Late Cretaceous Cretaceous Mesozoic Phanerozoic,,,Age,91,97.5 Early-Cretaceous,Cretaceous Mesozoic Phanerozoic,Albian Aptian Neocomian Barremian Hauterivian Valanginian Berriasian,,Epoch,97.5,144 Albian,Early Cretaceous Cretaceous Mesozoic Phanerozoic,,,Age,97.5,113 Aptian,Early Cretaceous Cretaceous Mesozoic Phanerozoic,,,Age,113,119 Neocomian,Early Cretacous Cretaceous Mesozoic Phanerozoic,Barremian Hauterivian Valanginian Berriasian,,Epoch,119,144 Early-Cretaceous-Neocomian,Cretaceous Mesozoic Phanerozoic,Neocomian Barremian Hauterivian Valanginian Berriasian,,Epoch,119,144 Barremian,Neocomian Early Cretaceous Cretaceous Mesozoic Phanerozoic,,,Age,119,124 Hauterivian,Neocomian Early Cretaceous Cretaceous Mesozoic Phanerozoic,,,Age,124,131 Valanginian,Neocomian Early Cretaceous Cretaceous Mesozoic Phanerozoic,,,Age,131,138 Berriasian,Neocomian Early Cretaceous Cretaceous Mesozoic Phanerozoic,,,Age,138,144 Jurassic,Mesozoic Phanerozoic,Late Jurassic Tithonian Kimmeridgian Oxfordian Middle Jurassic Callovian Bathonian Bajocian Aalenian Early Jurassic Toarcian Pliensbachian Sinemurian Hettangian,,Period,144,208 Late-Jurassic,Jurassic Mesozoic Phanerozoic,Tithonian Kimmeridgian Oxfordian,,Epoch,144,163 Tithonian,Late Jurassic Jurassic Mesozoic Phanerozoic,,,Age,144,152 Kimmeridgian,Late Jurassic Jurassic Mesozoic Phanerozoic,,,Age,152,156 Oxfordian,Late Jurassic Jurassic Mesozoic Phanerozoic,,,Age,156,163 Middle-Jurassic,Jurassic Mesozoic Phanerozoic,Callovian Bathonian Bajocian Aalenian,,Epoch,163,187 Callovian,Middle Jurassic Jurassic Mesozoic Phanerozoic,,,Age,163,169 Bathonian,Middle Jurassic Jurassic Mesozoic Phanerozoic,,,Age,169,176 Bajocian,Middle Jurassic Jurassic Mesozoic Phanerozoic,,,Age,176,183 Aalenian,Middle Jurassic Jurassic Mesozoic Phanerozoic,,,Age,183,187 Early-Jurassic,Jurassic Mesozoic Phanerozoic,Toarcian Pliensbachian Sinemurian Hettangian,,Epoch,187,208 Toarcian,Early Jurassic Jurassic Mesozoic Phanerozoic,,,Age,187,193 Pliensbachian,Early Jurassic Jurassic Mesozoic Phanerozoic,,,Age,193,198 Sinemurian,Early Jurassic Jurassic Mesozoic Phanerozoic,,,Age,198,204 Hettangian,Early Jurassic Jurassic Mesozoic Phanerozoic,,,Age,204,208 Triassic,Mesozoic Phanerozoic,Late Triassic Norian Carnian Middle Triassic Ladinian Anisian Early Triassic Scythian,"Rhaetian, Olenekian, Induan",Period,208,245 Late-Triassic,Triassic Mesozoic Phanerozoic,Norian Carnian,Rhaetian,Epoch,208,230 Norian,Late Triassic Triassic Mesozoic Phanerozoic,,Rhaetian,Age,208,225 Carnian,Late Triassic Triassic Mesozoic Phanerozoic,,,Age,225,230 Middle-Triassic,Triassic Mesozoic Phanerozoic,Ladinian Anisian,,Epoch,230,240 Ladinian,Middle Triassic Triassic Mesozoic Phanerozoic,,,Age,230,235 Anisian,Middle Triassic Triassic Mesozoic Phanerozoic,,,Age,235,240 Early-Triassic,Triassic Mesozoic Phanerozoic,Scythian,"Olenekian, Induan",Epoch,240,245 Scythian,Early Triassic Triassic Mesozoic Phanerozoic,,"Olenekian, Induan",Age,240,245 Paleozoic,Phanerozoic,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 Early Ordovician Cambrian Late Cambrian Middle Cambrian Early Cambrian,,Era,245,570 Permian,Paleozoic Phanerozoic,Late Permian Tatarian Kazanian Kazanian-Ufimian Ufimian Early Permian Kungurian Artinskian Sakmarian Sakmarian-Asselian Asseslian,Ufimian-Kazanian,Period,245,286 Late-Permian,Permian Paleozoic Phanerozoic,Tatarian Ufimian Ufimian-Kazanian Kazanian,Ufimian-Kazanian,Epoch,245,258 Tatarian,Late Permian Permian Paleozoic Phanerozoic,,,Age,245,253 Kazanian-Ufimian,Late Permian Permian Paleozoic Phanerozoic,Kazanian Ufimian,Ufimian-Kazanian. The two terms are lumped together as the same age with stratigraphic relativity.,Age,253,258 Kazanian,Late Permian Permian Paleozoic Phanerozoic,Ufimian,The Ufimian is lumped with the Kazanian as the same age and is stratigraphically older.,Age,253,258 Ufimian,Late Permian Permian Paleozoic Phanerozoic,Kazanian,The Kazanian is lumped with the Ufimian as the same age and is stratigraphically younger.,Age,253,258 Early-Permian,Permian Paleozoic Phanerozoic,Kungurian Artinskian Sakmarian Sakmarian-Asselian Asselian,,Epoch,258,286 Kungurian,Early Permian Permian Paleozoic Phanerozoic,,,Age,258,263 Artinskian,Early Permian Permian Paleozoic Phanerozoic,,,Age,263,268 Sakmarian-Asselian,Early Permian Permian Paleozoic Phanerozoic,Sakmarian Asselian,The two terms are lumped together as the same age with stratigraphic relativity.,Age,268,286 Sakmarian,Early Permian Permian Paleozoic Phanerozoic,Asselian,The Sakmarin is lumped with the Asselian as the same age and is stratigraphically younger.,Age,268,286 Asselian,Early Permian Permian Paleozoic Phanerozoic,Sakmarian,The Asselian is lumped with the Sakmarian as the same age and is stratigraphically older.,Age,268,286 Carboniferous,Paleozoic Phanerozoic,Pennsylvanian Late Carboniferous S. Gzelian Gzelian-Kasimovian Kasimovian W. Moscovian Bashkirian N. Mississippian Early Carboniferous N. Serpukhovian Visean Tournaisian,,Period,286,360 Pennsylvanian,Carboniferous Paleozoic Phanerozoic,Late Carboniferous S. Gzelian Gzelian-Kasimovian Kasimovian Moscovian W. Bashkirian N.,,Period,286,320 Carboniferous-Pennsylvanian,Carboniferous Paleozoic Phanerozoic,Late Carboniferous S. Gzelian Gzelian-Kasimovian Kasimovian Moscovian W. Bashkirian N.,,Period,286,320 Late-Carboniferous,Pennsylvanian Carboniferous Paleozoic Phanerozoic,Late Carboniferous S. Gzelian Gzelian-Kasimovian Kasimovian Moscovian W. Bashkirian N.,,Epoch,286,320 Gzelian-Kasimovian,S. Late Carboniferous Pennsylvanian Carboniferous Paleozoic Phanerozoic,S. Gzelian Kasimovian,The two terms are lumped together as the same age with stratigraphic relativity.,Age,286,296 S.,Gzelian Gzelian-Kasimovian Kasimovian Moscovian Late Carboniferous Pennsylvanian Carboniferous Paleozoic Phanerozoic,Gzelian Kasimovian,"Gzelian, Kasimovian, Moscovian",Age,286,296 Gzelian,S. Late Carboniferous Pennsylvanian Carboniferous Paleozoic Phanerozoic,S. Kasimovian,The Gzelian is lumped with the Kasimovian as the same age and is stratigraphically younger.,Age,286,296 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.,Age,290,305 W.,Moscovian Bashkirian Late Carboniferous Pennsylvanian Carboniferous Paleozoic Phanerozoic,Moscovian Bashkirian,,Age,296,315 Bashkirian,W. N. Late Carboniferous Pennsylvanian Carboniferous Paleozoic Phanerozoic,W. N.,The Minimum Age is approximate and was not listed on the source.,Age,305,320 N.,Serpukhovian Early Carboniferous Mississippian Bashkirian Late Carboniferous Pennsylvanian Carboniferous Paleozoic Phanerozoic,Bashkirian Serpukhovian,,Age,315,333 Mississippian,N. Carboniferous Paleozoic Phanerozoic,N. Early Carboniferous Serpukhovian Visean Tournaisian,,Period,320,360 Carboniferous-Mississippian,N. Carboniferous Paleozoic Phanerozoic,N. Early Carboniferous Serpukhovian Visean Tournaisian,,Period,320,360 Early-Carboniferous,N. Mississippian Carboniferous Paleozoic Phanerozoic,N. Serpukhovian Visean Tournaisian,,Epoch,320,360 Serpukhovian,Early Carboniferous Mississippian N. Carboniferous Paleozoic Phanerozoic,N.,,Age,320,333 Visean,Early Carboniferous Mississippian Carboniferous Paleozoic Phanerozoic,,,Age,333,352 Tournaisian,Early Carboniferous Mississippian Carboniferous Paleozoic Phanerozoic,,,Age,352,360 Devonian,Paleozoic Phanerozoic,Late Devonian Famennian Frasnian Middle Devonian Givetian Eifelian Early Devonian Emsian Siegenian Gedinnian ,"Praghian, Lockhovian",Period,360,408 Late-Devonian,Devonian Paleozoic Phanerozoic,Famennian Frasnian,,Epoch,360,374 Famennian,Late Devonian Devonian Paleozoic Phanerozoic,,,Age,360,367 Frasnian,Late Devonian Devonian Paleozoic Phanerozoic,,,Age,367,374 Middle-Devonian,Devonian Paleozoic Phanerozoic,Givetian Eifelian,,Epoch,374,387 Givetian,Middle Devonian Devonian Paleozoic Phanerozoic,,,Age,374,380 Eifelian,Middle Devonian Devonian Paleozoic Phanerozoic,,,Age,380,387 Early-Devonian,Devonian Paleozoic Phanerozoic,Emsian Siegenian Gedinnian,"Praghian, Lockhovian",Epoch,387,408 Emsian,Early Devonian Devonian Paleozoic Phanerozoic,,,Age,387,394 Siegenian,Early Devonian Devonian Paleozoic Phanerozoic,,Praghian,Age,394,401 Gedinnian,Early Devonian Devonian Paleozoic Phanerozoic,,Lockhovian,Age,401,408 Silurian,Paleozoic Phanerozoic,Late Silurian Pridolian Ludlovian Early Silurian Wenlockian Llandoverian,,Period,408,438 Late-Silurian,Silurian Paleozoic Phanerozoic,Pridolian Ludlovian,,Epoch,408,421 Pridolian,Late Silurian Silurian Paleozoic Phanerozoic,,,Age,408,414 Ludlovian,Late Silurian Silurian Paleozoic Phanerozoic,,,Age,414,421 Early-Silurian,Silurian Paleozoic Phanerozoic,Wenlockian Llandoverian,,Epoch,421,438 Wenlockian,Early Silurian Silurian Paleozoic Phanerozoic,,,Age,421,428 Llandoverian,Early Silurian Silurian Paleozoic Phanerozoic,,,Age,428,438 Ordovician,Paleozoic Phanerozoic,Late Ordovician Ashgillian Caradocian Middle Ordovician Llandeilian Llanvirnian Early Ordovician Arenigian Tremadocian,,Period,438,505 Late-Ordovician,Ordovician Paleozoic Phanerozoic,Ashgillian Caradocian,,Epoch,438,458 Ashgillian,Late Ordovician Ordovician Paleozoic Phanerozoic,,,Age,438,448 Caradocian,Late Ordovician Ordovician Paleozoic Phanerozoic,,,Age,448,458 Middle-Ordovician,Ordovician Paleozoic Phanerozoic,Llandeilian Llanvirnian,,Epoch,458,478 Llandeilian,Middle Ordovician Ordovician Paleozoic Phanerozoic,,,Age,458,468 Llanvirnian,Middle Ordovician Ordovician Paleozoic Phanerozoic,,,Age,468,478 Early-Ordovician,Ordovician Paleozoic Phanerozoic,Arenigian Tremadocian,,Epoch,478,505 Arenigian,Early Ordovician Ordovician Paleozoic Phanerozoic,,,Age,478,488 Tremadocian,Early Ordovician Ordovician Paleozoic Phanerozoic,,,Age,488,505 Cambrian,Paleozoic Phanerozoic,Late Cambrian Trempealeauan Franconian Dresbachian Middle Cambrian Early Cambrian,"Sunwaptan, Steptoean, Marjuman, Delamaran, Dyeran, Montezuman, D Cambrian, C Cambrian, B Cambrian, A Cambrian",Period,505,570 Late-Cambrian,Cambrian Paleozoic Phanerozoic,Trempealeauan Franconian Dresbachian,"Sunwaptan, Steptoean, Marjuman, Delamaran, Dyeran, Montezuman, D Cambrian, C Cambrian, B Cambrian, A Cambrian",Epoch,505,523 Trempealeauan-Franconian-Dresbachian,Late Cambrian Cambrian Paleozoic Phanerozoic,Trempealeauan Franconian Dresbachian,"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.",Age,505,515 Trempealeauan,Late Cambrian Cambrian Paleozoic Phanerozoic,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.",Age,505,515 Franconian,Late Cambrian Cambrian Paleozoic Phanerozoic,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.",Age,505,515 Dresbachian,Late Cambrian Cambrian Paleozoic Phanerozoic,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.",Age,505,515 Middle-Cambrian,Cambrian Paleozoic Phanerozoic,,A Cambrian.,Epoch,523,540 Early-Cambrian,Cambrian Paleozoic Phanerozoic,,A Cambrian.,Epoch,540,570 Proterozoic,PreCambrian,PreCambrian Late Proterozoic Middle Proterozoic Early Proterozoic,"Algonkian. The Proterozoic is an Eon, which is a broader term than Era (the PreCambrian).",Eon,570,2500 PreCambrian,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.",Era,570,4600 Late-Proterozoic,Proterozoic PreCambrian,,,Era,570,900 Middle-Proterozoic,Proterozoic PreCambrian,Late-Middle-Proterozoic Middle-Middle-Proterozoic Early-Middle-Proterozoic,,Era,900,1600 Late-Middle-Proterozoic,Proterozoic PreCambrian Middle-Proterozic,,,Era,900,1200 Middle-Middle-Proterozoic,Proterozoic PreCambrian Middle-Proterozic,,,Era,1200,1400 Early-Middle-Proterozoic,Proterozoic PreCambrian Middle-Proterozic,,,Era,1400,1600 Early-Proterozoic,Proterozoic PreCambrian,,,Era,1600,2500 Late-Early-Proterozoic,Proterozoic PreCambrian Early-Proterozic,,,Era,1600,1800 Middle-Early-Proterozoic,Proterozoic PreCambrian Early-Proterozic,,,Era,1800,2100 Early-Early-Proterozoic,Proterozoic PreCambrian Early-Proterozic,,,Era,2100,2500 Archean,PreCambrian,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.",Eon,2500,4600 Late-Archean,Archean PreCambrian,,,Era,2500,3000 Middle-Archean,Archean PreCambrian,,,Era,3000,3400 Early-Archean,Archean PreCambrian,,The Early Archean is projected to 3800? my. The oldest rock found on Earth is believed to be 4600 my.,Era,3400,4600