Present
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Precambrian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Archean
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Paleoarchean
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Mesoarchean
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Neoarchean
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Proterozoic
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Rhyacian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Orosirian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Statherian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Mesoproterozoic
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Ectasian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Stenian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Neoproterozoic
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Cryogenian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Ediacaran
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Upper Edicaran
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Phanerozoic
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Tommotian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Lenian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Amgaian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Mayaian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Jiangshanian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Stage10
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Ordovician
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Middle Ordovician
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Llanvirn
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Llandeilo
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Upper Ordovician
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Ashgill
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Lower Ashgill
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Silurian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Aeronian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Telychian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Wenlock
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Homerian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Ludlow
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Ludfordian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Pridoli
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Devonian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Upper Lochkovian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Pragian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Upper Pragian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Emsian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Upper Emsian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Middle Devonian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Upper Eifelian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Givetian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Upper Givetian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Upper Devonian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Upper Frasnian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Famennian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Upper Famennian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Carboniferous
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Upper Tournaisian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Upper Visean
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Namurian C
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Westphalian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Westphalian A
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Westphalian B
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Westphalian D
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Stephanian A
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Stephanian B
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Permian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Mesozoic
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Olenekian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Upper Olenekian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Middle Triassic
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Upper Anisian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Ladinian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Upper Ladinian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Upper Triassic
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Upper Carnian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Norian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Upper Norian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Rhaetian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Upper Rhaetian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Jurassic
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Middle Hettangian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Upper Hettangian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Sinemurian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Upper Sinemurian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Pliensbachian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Upper Pliensbachian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Toarcian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Middle Toarcian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Upper Toarcian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Middle Aalenian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Upper Aalenian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Bajocian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Upper Bajocian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Bathonian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Middle Bathonian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Upper Bathonian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Callovian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Middle Callovian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Upper Callovian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Middle Oxfordian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Upper Oxfordian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Kimmeridgian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Upper Kimmeridgian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Tithonian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Middle Tithonian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Upper Tithonian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Cretaceous
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Middle Berriasian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Upper Berriasian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Valanginian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Upper Valanginian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Hauterivian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Upper Hauterivian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Barremian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Upper Barremian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Aptian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Upper Aptian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Albian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Middle Albian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Upper Albian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Upper Cretaceous
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Middle Cenomanian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Upper Cenomanian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Turonian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Middle Turonian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Upper Turonian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Coniacian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Middle Coniacian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Upper Coniacian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Santonian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Middle Santonian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Upper Santonian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Campanian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Middle Campanian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Upper Campanian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Maastrichtian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Upper Maastrichtian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Cenozoic
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Selandian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Thanetian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Eocene
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Upper Ypresian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Lutetian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Middle Lutetian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Upper Lutetian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Bartonian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Upper Bartonian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Priabonian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Oligocene
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Chattian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Neogene
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Upper Aquitanian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Burdigalian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Upper Burdigalian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Langhian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Serravallian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Tortonian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Messinian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Pliocene
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Piacenzian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Quaternary
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Praetiglian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Tiglian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Eburonian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Waalian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Menapian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Bavelian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Cromerian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Middle Pleistocene
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Cromerian I
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Glacial a
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Cromeriann II
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Glacial b
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Cromerian III
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Glacial c
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Cromerian IV
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Elsterian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Holsteinian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Saalian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Fuhne
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Wacken/Dömnitz
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Drenthe
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Saale/Warthe
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Warthe
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Upper/Late Pleistocene
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Weichselian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Early Weichselian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Middle Weichselian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Lower Pleniglacial
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Interpleniglacial
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Upper Weichselian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Upper Pleniglacial
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Late Glacial
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Holocene
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Boreal
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Atlantic
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Subboreal
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Subatlantic
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Icartian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Paleo-proterozoic
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Sturtian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Vendian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Stage2
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Series2
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Stage4
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Miaolingian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Drumian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Guzhangian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Furongian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Floian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Darriwilian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Katian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Hirnantian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Couvinian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Middle Mississippian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Upper Mississippian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Strunian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Ivorian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Livian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Arundian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Holkerian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Asbian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Brigantian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Warnantian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Pennsylvanian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Middle Pennsylvanian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Upper Pennsylvanian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Gzhelian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Sakmarian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Artinskian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Kungurian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Guadalupian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Wordian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Capitanian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Lopingian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Changhsingian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Lotharigian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Domerian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Middle Jurassic
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Upper Jurassic
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Astartian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Sequanian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Pterocerian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Virgulian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Middle Volgian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Upper Volgian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Portlandian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Lower Portlandian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Upper Portlandian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Purbeckian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Purbecko-wealdian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Gargasian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Clansayesian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Vraconian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Fuvelian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Dano-montian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Montian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Heersian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Cuisian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Ledian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Wemmelian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Assian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Marinesian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Orleanian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Astaracian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Savignean
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Redonian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Poederlian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Reuverian B
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Reuverian C
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Upper Villafranchian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Biber
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Biber/Donau Interglacial
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Calabrian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Emilian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Sicilian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Donau
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Donau/Gunz Interglacial
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Gunz
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Gunz/Mindel Interglacial
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Mindel
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Mindel/Riss Interglacial
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Riss
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Wurm
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of Würm I
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Würm II
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Würm III
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Würm IV
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Oldest Dryas
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Bølling
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Older Dryas
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Allerød
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Younger Dryas
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Dienerian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Spathian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Middle Anisian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Bithynian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Pelsonian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Illyrian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Longobardian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of Tuvalian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of Alaunian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Sevatian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Middle Holocene
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Upper/Late Holocene
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Paniselian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of Toyonian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Botomian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of Middle Visean
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of Middle Norian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of GS-26
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of GI-25c
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of GI-25b
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of GI-25a
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of GS-25
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of GI-24.2
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of GS-24.2
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of GI-24.1c
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of GI-24.1b
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of GI-24.1a
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of GS-24.1
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of GI-23.2
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of GS-23.2
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of GI-23.1
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of GS-23.1
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of GI-22g
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of GI-22f
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of GI-22e
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of GI-22d
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of GI-22c
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of GI-22b
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of GI-22a
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of GS-22
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of GI-21.2
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of GS-21.2
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of GI-21.1e
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of GI-21.1d
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of GI-21.1c
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of GI-21.1b
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of GI-21.1a
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of GS-21.1
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of GI-20c
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of GI-20b
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of GI-20a
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of GS-20
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of GI-19.2
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of GS-19.2
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of GI-19.1
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of GS-19.1
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of GI-18
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of GS-18
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of GI-17.2
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of GS-17.2
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of GI-17.1c
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of GI-17.1b
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of GI-17.1a
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of GS-17.1
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of GI-16.2
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of GS-16.2
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of GI-16.1c
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of GI-16.1b
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of GI-16.1a
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of GS-16.1
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of GI-15.2
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of GS-15.2
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of GI-15.1
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of GS-15.1
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of GI-14e
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of GI-14d
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of GI-14c
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of GI-14b
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of GI-14a
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of GS-14QS
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of GI-13c
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of GI-13b
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of GI-13a
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of GS-13
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of GI-12c
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of GI-12b
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of GI-12a
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of GS-12
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of GI-11
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of GS-11
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of GI-10
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of GS-10
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of GI-9
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of GS-9
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of GI-8c
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of GI-8b
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of GI-8a
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of GS-8
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of GI-7c
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of GI-7b
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of GI-7a
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of GS-7
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of GI-6
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of GS-6
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of GI-5.2
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of GS-5.2
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of GI-5.1
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of GS-5.1
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of GI-4
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of GS-4
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of GI-3
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
Base of GS-3
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of GI-2.2
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of GS-2.2
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of GI-2.1
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of GS-2.1c
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of GS-2.1b
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of GS-2.1a
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of GI-1e
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of GI-1d
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
Base of GI-1c3
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of GI-1c2
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
Base of GI-1c1
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
Base of GI-1b
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
Base of GI-1a
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
Base of GS-1
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
End of Lenian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
End of Amgaian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
End of Mayaian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
End of Arenig
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
End of Caradoc
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
End of Upper Caradoc
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
End of Namurian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
End of Namurian C
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
End of Stephanian C
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
End of Lower Olenekian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
End of Lower Anisian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
End of Lower Ladinian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
End of Lower Carnian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
End of Lower Norian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
End of Lower Pliensbachian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
End of Middle Toarcian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
End of Middle Berriasian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
End of Upper Lutetian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
End of Lower Bartonian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
End of Bavelian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
End of Holsteinian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
End of Eemian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
End of Early Weichselian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
End of Middle Weichselian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
End of Interpleniglacial
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
End of Upper Pleniglacial
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
End of Icartian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
End of Paleo-proterozoic
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
End of Sturtian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
End of Acadian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
End of Devillian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
End of Skiddavian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
End of Molinacian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
End of Livian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
End of Arundian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
End of Holkerian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
End of Upper Namurian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
End of Carixian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
End of Neuzivian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
End of Villersian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
End of Lusitanian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
End of Sequanian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
End of Pterocerian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
End of Volgian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
End of Upper Volgian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
End of Portlandian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
End of Upper Portlandian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
End of Urgonian (Provence)
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
End of Urgonian (Vercors)
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
End of Urgonian (Jura)
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
End of Bedoulian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
End of Rognacian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
End of Ilerdian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
End of Biarritzian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
End of Assian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
End of Auversian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
End of Lattorfian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
End of Tongrian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
End of Upper Tongrian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
End of Sannoisian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
End of Astaracian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
End of Savignean
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
End of Villafranchian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
End of Upper Villafranchian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
End of Biber/Donau Interglacial
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
End of Tyrrhenian
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
End of Riss/Wurm interglacial
|
|
era boundary
, geochronologic boundary
, Concept
|
experimental
|
End of Oldest Dryas
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
End of Smithian
|
|
geochronologic boundary
, era boundary
, Concept
|
experimental
|
End of Aegean
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
End of Middle Anisian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
End of Pelsonian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
End of Fassanian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
End of Julian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
End of Lacian
|
|
geochronologic boundary
, Concept
, era boundary
|
experimental
|
End of Alaunian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|
End of Toyonian
|
|
Concept
, era boundary
, geochronologic boundary
|
experimental
|
End of Botomian
|
|
era boundary
, Concept
, geochronologic boundary
|
experimental
|
End of Middle Norian
|
|
Concept
, geochronologic boundary
, era boundary
|
experimental
|