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{{#switch:{{lc:{{{1|{{PAGENAME}}}}}}}
|hadeikum=arkeikum 
|isuan=swazian
|arkeikum=proterozoikum 
|proterozoikum|prekambrium=fanerozoikum

|eoarkeikum=palaeoarkeikum
|palaeoarkeikum|paleoarkeikum=mesoarkeikum
|mesoarkeikum=neoarkeikum
|neoarkeikum=paleoproterozoikum 
|paleoproterozoikum=mesoproterozoikum 
|mesoproterozoikum=neoproterozoikum 
|neoproterozoikum=paleozoic 
|proterozoikum=paleozoic
|sinian=paleozoic
|sturtian=vendian
|paleozoic=mesozoikum 
|mesozoikum=kenozoikum 

|siderian=rhyacian
|rhyacian=orosirian
|orosirian=statherian
|statherian=calymmian
|calymmian=ectasian
|ectasian=stenian
|stenian=tonian
|tonian=cryogenian
|baikalian=vendian
|riphean=aimchanian
|aimchanian=mayanian
|cryogenian=ediacara
|ediacara=kambrium
|vendian=kambrium
|merioneth=ordovicium
|kambrium=ordovicium 
|ordovicium=silur 
|silur=devon 
|devon|devon (geologi)=mississippian
|mississippian=pennsylvanian
|pennsylvanian|karbon|karbon (geologi)=perm 
|perm|perm (geologi)=trias 
|trias=jura 
|jura|jura (geologi)=kritt 
|kritt|kritt (geologi)=paleogen 
|paleogen=neogen 

|neoarkeikum=statherian
|statherian=tonian
|tonian=tidlig kambrium

|terreneuvian|tommotian=series 2
|atdabanian=botomian
|series 2|kambrium series 2=series 3
|series 3|kambrium series 3=øvre kambrium
|midtre kambrium|mid kambrium|st davids=sen kambrium
|manykaian|nemakit-daldynian=caerfai
|tidlig kambrium|nedre kambrium|caerfai=midtre kambrium
|mayan=nganasanian
|nganasanian|mindyallan=merioneth
|sen kambrium|øvre kambrium|franconian|furongian|mansian=nedre ordovicium<!--Franconian doesn't really belong here but this'll do for a crude approximation-->

|tidlig ordovicium|nedre ordovicium|sen tidlig ordovicium=midtre ordovicium
|midtre ordovicium|mid ordovicium = sen ordovicium
|sen ordovicium|øvre ordovicium=llandovery|llandovery=wenlock
|wenlock=ludlow
|ludlow=pridoli
|pridoli|unnamed pridoli stage=lochkovian
|tidlig silur|nedre silur=sen silur 
|sen silur|øvre silur=tidlig devon
|tidlig devon|nedre devon=midtre devon
|midtre devon|mid devon=sen devon
|sen devon|øvre devon=mississippian
|tidlig karbon|nedre karbon|mississippian=pennsylvanian
|tidlig mississippian|nedre mississippian=midtre mississippian
|midtre mississippian|mid mississippian=sen mississippian
|sen mississippian|øvre mississippian=tidlig pennsylvanian
|tidlig pennsylvanian|nedre pennsylvanian=midtre pennsylvanian
|midtre pennsylvanian|mid pennsylvanian=sen pennsylvanian
|sen pennsylvanian|øvre pennsylvanian=tidlig perm
|sen karbon|øvre karbon|pennsylvanian=perm
|tidlig perm|nedre perm|cisuralian=midtre perm
|midtre perm|mid perm|guadalupian=sen perm
|sen perm|øvre perm|lopingian=tidlig trias
|tidlig trias|nedre trias=midtre trias
|midtre trias|mid trias=sen trias
|sen trias|øvre trias=tidlig jura
|tidlig jura|nedre jura=midtre jura
|midtre jura|mid jura=sen jura
|sen jura|øvre jura=tidlig kritt
|tidlig kritt|nedre kritt=sen kritt
|sen kritt|øvre kritt|senonian=paleocen
|paleocen=eocen
|eocen=oligocen 
|oligocen=miocen 
|miocen=pliocene 
|pliocene=pleistocen
|pleistocen|rancholabrean=holocen

<!-- these are duplicated below, and the last one is wrong -->
<!--
|tidlig paleocen|nedre paleocen=midtre paleocen
|midtre paleocen|mid paleocen=sen paleocen
|sen paleocen|øvre paleocen=tidlig eocen
|tidlig eocen|nedre eocen=midtre eocen
|midtre eocen|mid eocen=sen eocen
|sen eocen|øvre eocen=tidlig oligocen
|tidlig oligocen|nedre oligocen=sen oligocen
|sen oligocen|øvre oligocen=tidlig miocen
|tidlig miocen|nedre miocen=midtre miocen
|midtre miocen|mid miocen=sen miocen
|sen miocen|øvre miocen=tidlig pliocene
|tidlig pliocene|nedre pliocene=sen pliocene
|sen pliocene|øvre pliocene=holocen
-->

|fortunean|earliest kambrium=stage 2
|kambrium stage 2|stage 2=stage 3
|kambrium stage 3|stage 3=stage 4
|kambrium stage 4|stage 4|sen tidlig kambrium=stage 5
|kambrium stage 5|stage 5|tidlig midtre kambrium=drumian
|drumian=guzhangian
|guzhangian=øvre kambrium<!-- fix! -->
|paibian=tremadocian
|tremadocian=floian
|arenig|floian=dapingian
|ordovicium iii|dapingian|tidlig midtre ordovicium=darriwilian
|darriwilian=sandbian
|ordovicium v|sandbian=katian
|tidlig sen ordovicium=midtre sen ordovicium
|ordovicium vi|katian|midtre sen ordovicium=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=tidlig mississippian
|tidlig mississippian|nedre mississippian=midtre mississippian 
|midtre mississippian|mid mississippian=sen mississippian 
|sen mississippian|øvre mississippian=tidlig pennsylvanian 
|tidlig pennsylvanian|nedre pennsylvanian=midtre pennsylvanian 
|midtre pennsylvanian|mid pennsylvanian=sen pennsylvanian 
|sen pennsylvanian|øvre pennsylvanian=asselian
|namurian=westphalian
|westphalian=stephanian
|stephanian=perm
|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
|nedre ladinian=midtre ladinian
|midtre ladinian=øvre ladinian
|ladinian|øvre 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=tidlig paleocen 
|tidlig paleocen|nedre paleocen=midtre paleocen 
|midtre paleocen|mid paleocen=sen paleocen 
|sen paleocen|øvre paleocen=tidlig eocen 
|tidlig eocen|nedre eocen=midtre eocen 
|midtre eocen|mid eocen=sen eocen 
|sen eocen|øvre eocen=tidlig oligocen 
|tidlig oligocen|nedre oligocen=sen oligocen 
|sen oligocen|øvre oligocen=tidlig miocen 
|tidlig miocen|nedre miocen=midtre miocen 
|midtre miocen|mid miocen=sen miocen 
|sen miocen|øvre miocen=tidlig pliocene 
|tidlig pliocene|nedre pliocene=sen pliocene 
|sen pliocene|øvre pliocene=tidlig pleistocen
|tidlig pleistocen|nedre pleistocen=midtre pleistocen
|midtre pleistocen|mid pleistocen=sen pleistocen
|sen pleistocen=holocen

|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

|tertiær=kvartær
|neogen=kvartær
|holocen|kvartær|kenozoikum|fanerozoikum|intil nylig|nå=nålevende
|{{{1|{{PAGENAME}} }}} }}<noinclude>{{template doc}}</noinclude>