வார்ப்புரு:Next period
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 |hadean=archean 
 |isuan=swazian
 |archean=proterozoic 
 |proterozoic|முன் கேம்பிரியன்=phanerozoic
 
 |eoarchean=palaeoarchean
 |palaeoarchean|paleoarchean=mesoarchean
 |mesoarchean=neoarchean
 |neoarchean=paleoproterozoic 
 |paleoproterozoic=mesoproterozoic 
 |mesoproterozoic=neoproterozoic 
 |neoproterozoic=paleozoic 
 |proterozoic=paleozoic
 |sinian=paleozoic
 |sturtian=vendian
 |paleozoic=mesozoic 
 |mesozoic=cenozoic 
 
 |siderian=rhyacian
 |rhyacian=orosirian
 |orosirian=statherian
 |statherian=calymmian
 |calymmian=ectasian
 |ectasian=stenian
 |stenian=tonian
 |tonian=cryogenian
 |baikalian=vendian
 |riphean=aimchanian
 |aimchanian=mayanian
 |cryogenian=ediacaran
 |ediacaran=கேம்பிரியக் காலம்
 |vendian=கேம்பிரியக் காலம்
 |merioneth=ஓர்டோவிசியக் காலம்
 |கேம்பிரியக் காலம்=ஓர்டோவிசியக் காலம்
 |ஓர்டோவிசியக் காலம்=சிலுரியக் காலம்
 |சிலுரியக் காலம்=டெவோனியக் காலம்
 |டெவோனியக் காலம்=mississippian
 |mississippian=pennsylvanian
 |pennsylvanian|கார்பனிபெரசுக் காலம்=பேர்மியன் காலம்
 |பேர்மியன் காலம்=டிராசிக் காலம்
 |டிராசிக் காலம்=சுராசிக் காலம்
 |சுராசிக் காலம்=கிரீத்தேசியக் காலம்
 |கிரீத்தேசியக் காலம்=பாலியோயின் காலம்
 |பாலியோயின் காலம்=நியோயின் காலம்
 
 |neoarchean=statherian
 |statherian=tonian
 |tonian=early cambrian
 
 |terreneuvian|tommotian=series 2
 |atdabanian=botomian
 |series 2|cambrian series 2=series 3
 |series 3|cambrian series 3=upper cambrian
 |middle cambrian|mid cambrian|st davids=late cambrian
 |manykaian|nemakit-daldynian=caerfai
 |early cambrian|lower cambrian|caerfai=middle cambrian
 |mayan=nganasanian
 |nganasanian|mindyallan=merioneth
 |late cambrian|upper cambrian|franconian|furongian|mansian=lower ordovician&lt;!--Franconian doesn't really belong here but this'll do for a crude approximation--&gt;
 
 |early ordovician|lower ordovician|late early ordovician=middle ordovician
 |middle ordovician|mid ordovician = late ordovician
 |late ordovician|upper ordovician=llandovery|llandovery=wenlock
 |wenlock=ludlow
 |ludlow=pridoli
 |pridoli|unnamed pridoli stage=lochkovian
 |early silurian|lower silurian=late silurian 
 |late silurian|upper silurian=early devonian
 |early devonian|lower devonian=middle devonian
 |middle devonian|mid devonian=late devonian
 |late devonian|upper devonian=mississippian
 |early carboniferous|lower carboniferous|mississippian=pennsylvanian
 |early mississippian|lower mississippian=middle mississippian
 |middle mississippian|mid mississippian=late mississippian
 |late mississippian|upper mississippian=early pennsylvanian
 |early pennsylvanian|lower pennsylvanian=middle pennsylvanian
 |middle pennsylvanian|mid pennsylvanian=late pennsylvanian
 |late pennsylvanian|upper pennsylvanian=early permian
 |late carboniferous|upper carboniferous|pennsylvanian=permian
 |early permian|lower permian|cisuralian=middle permian
 |middle permian|mid permian|guadalupian=late permian
 |late permian|upper permian|lopingian=early triassic
 |early triassic|lower triassic=middle triassic
 |middle triassic|mid triassic=late triassic
 |late triassic|upper triassic=early jurassic
 |early jurassic|lower jurassic=middle jurassic
 |middle jurassic|mid jurassic=late jurassic
 |late jurassic|upper jurassic=early cretaceous
 |early cretaceous|lower cretaceous=late cretaceous
 |late cretaceous|upper cretaceous|senonian=paleocene
 |paleocene=eocene
 |eocene=oligocene 
 |oligocene=miocene 
 |miocene=pliocene 
 |pliocene=pleistocene
 |pleistocene|rancholabrean=holocene
 
 &lt;!-- these are duplicated below, and the last one is wrong --&gt;
 &lt;!--
 |early paleocene|lower paleocene=middle paleocene
 |middle paleocene|mid paleocene=late paleocene
 |late paleocene|upper paleocene=early eocene
 |early eocene|lower eocene=middle eocene
 |middle eocene|mid eocene=late eocene
 |late eocene|upper eocene=early oligocene
 |early oligocene|lower oligocene=late oligocene
 |late oligocene|upper oligocene=early miocene
 |early miocene|lower miocene=middle miocene
 |middle miocene|mid miocene=late miocene
 |late miocene|upper miocene=early pliocene
 |early pliocene|lower pliocene=late pliocene
 |late pliocene|upper pliocene=holocene
 --&gt;
 
 |fortunean|earliest cambrian=stage 2
 |cambrian stage 2|stage 2=stage 3
 |cambrian stage 3|stage 3=stage 4
 |cambrian stage 4|stage 4|late early cambrian=stage 5
 |cambrian stage 5|stage 5|early middle cambrian=drumian
 |drumian=guzhangian
 |guzhangian=paibian
 |late middle cambrian|paibian=jiangshanian
 |jiangshanian=stage 10
 |cambrian stage 10|stage 10=tremadocian
 |tremadocian=floian
 |arenig|floian=dapingian
 |ordovician iii|dapingian|early middle ordovician=darriwilian
 |darriwilian=sandbian
 |ordovician v|sandbian=katian
 |early late ordovician=middle late ordovician
 |ordovician vi|katian|middle late ordovician=hirnantian
 |hirnantian=llandovery 
 |llandovery=wenlock 
 |wenlock=ludlow 
 |ludlow=pridoli
 |pridoli=lochkovian
 |lochkovian=pragian
 |pragian|praghian=emsian
 |emsian=eifelian
 |eifelian=givetian
 |givetian=frasnian
 |frasnian=famennian
 |famennian=early mississippian
 |early mississippian|lower mississippian=middle mississippian 
 |middle mississippian|mid mississippian=late mississippian 
 |late mississippian|upper mississippian=early pennsylvanian 
 |early pennsylvanian|lower pennsylvanian=middle pennsylvanian 
 |middle pennsylvanian|mid pennsylvanian=late pennsylvanian 
 |late pennsylvanian|upper pennsylvanian=asselian
 |namurian=westphalian
 |westphalian=stephanian
 |stephanian=permian
 |asselian=sakmarian
 |sakmarian=artinskian
 |artinskian=kungurian
 |kungurian=roadian
 |roadian|ufimian=wordian
 |wordian=capitanian
 |capitanian=wuchiapingian
 |wuchiapingian|longtanian=changhsingian
 |changhsingian=induan
 |induan=olenekian
 |olenekian|spathian=anisian
 |hydaspian=pelsonian
 |pelsonian=illirian
 |anisian|illirian=ladinian
 |lower ladinian=middle ladinian
 |middle ladinian=upper ladinian
 |ladinian|upper ladinian=carnian
 |carnian=norian
 |norian=rhaetian
 |rhaetian=hettangian
 |hettangian=sinemurian
 |sinemurian=pliensbachian
 |pliensbachian=toarcian
 |toarcian=aalenian
 |aalenian=bajocian
 |bajocian=bathonian
 |bathonian=callovian
 |callovian=oxfordian
 |oxfordian=kimmeridgian
 |kimmeridgian=tithonian
 |tithonian=berriasian
 |berriasian=valanginian
 |valanginian=hauterivian
 |hauterivian|neocomian=barremian
 |barremian=aptian
 |aptian=albian
 |albian=cenomanian
 |cenomanian=turonian
 |turonian|gallic=coniacian
 |coniacian=santonian
 |santonian=campanian
 |campanian=maastrichtian
 |maastrichtian=early paleocene 
 |early paleocene|lower paleocene=middle paleocene 
 |middle paleocene|mid paleocene=late paleocene 
 |late paleocene|upper paleocene=early eocene 
 |early eocene|lower eocene=middle eocene 
 |middle eocene|mid eocene=late eocene 
 |late eocene|upper eocene=early oligocene 
 |early oligocene|lower oligocene=late oligocene 
 |late oligocene|upper oligocene=early miocene 
 |early miocene|lower miocene=middle miocene 
 |middle miocene|mid miocene=late miocene 
 |late miocene|upper miocene=early pliocene 
 |early pliocene|lower pliocene=late pliocene 
 |late pliocene|upper pliocene=early pleistocene
 |early pleistocene|lower pleistocene=middle pleistocene
 |middle pleistocene|mid pleistocene=late pleistocene
 |late pleistocene=holocene
 
 |rhuddanian=aeronian
 |aeronian=telychian
 |telychian=sheinwoodian
 |sheinwoodian=homerian
 |homerian=gorstian
 |gorstian=ludfordian
 |ludfordian=pridoli
 
 |famennian=tournaisian
 |tournaisian=visean
 |visean=serpukhovian
 |serpukhovian=bashkirian
 |bashkirian=moscovian
 |moscovian=kasimovian
 |kasimovian=gzhelian
 |gzhelian=asselian
 |asselian=sakmarian
 |sakmarian=artinskian
 |artinskian=kungurian
 |kungurian=roadian
 |roadian=wordian
 |wordian=capitanian
 |capitanian=wuchiapingian
 |wuchiapingian=changhsingian
 
 |puercan=torrejonian
 |torrejonian=tiffanian
 |tiffanian=clarkforkian
 |clarkforkian=wasatchian
 |wasatchian=bridgerian
 |bridgerian=uintan
 |uintan=duchesnean
 |duchesnean=chadronian
 |chadronian=orellan
 |orellan=whitneyan
 |whitneyan=arikareean
 |arikareean=hemingfordian
 |hemingfordian=barstovian
 |barstovian=clarendonian
 |clarendonian=hemphillian
 |hemphillian=blancan
 |blancan=irvingtonian
 |irvingtonian=rancholabrean
 
 
 |danian=selandian
 |selandian=thanetian
 |thanetian=ypresian
 |ypresian=lutetian
 |mp 10=mp 11
 |lutetian|mp 11=bartonian
 |bartonian=priabonian
 |priabonian=rupelian
 |rupelian=chattian
 |chattian=aquitanian
 |aquitanian=burdigalian
 |burdigalian=langhian
 |langhian=serravallian
 |serravallian=tortonian
 |tortonian=messinian
 |messinian=zanclean
 |zanclean=piacenzian
 |piacenzian=gelasian
 |gelasian=calabrian
 
 |tertiary=quaternary
 |neogene=quaternary
 |holocene|quaternary|cenozoic|phanerozoic|now|recent|present=now