نمایش مبدأ برای الگو:Period start

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<!-- We can also include notable dates which are subject to change, e.g. Burgess shale-->
|burgess shale|mid middle cambrian<!--Mid middle is approximate; cf. Burgess Shale-->=505
|chengjiang=524
|sirius passet=525
|doushantou=570


|hadean|precambrian=4567.17
|archean
 |eoarchean|isuan=3800
 |paleoarchean|palaeoarchean=3600
 |mesoarchean=3200
 |neoarchean=2800
|proterozoic
 |paleoproterozoic|palaeoproterozoic
  |siderian=2500
  |rhyacian=2300
  |orosirian=2050
  |statherian=1800
 |mesoproterozoic
  |calymmian=1600
  | riphean|ectasian=1400
  | stenian=1200
 |neoproterozoic
  |tonian=1000
  | cryogenian|baikalian=850 
  | ediacaran|vendian=630
  | mayanian=1100
  | sinian|sturtian=1050
|phanerozoic
 |paleozoic
  |cambrian
   |earliest cambrian|early cambrian|lower cambrian|terreneuvian|fortunean|manykaian|nemakit-daldynian=542
   |caerfai|tommotian=530
   |cambrian stage 2=528
   |atdabanian|series 2|cambrian series 2|stage 3|cambrian stage 3|mid early cambrian|middle early cambrian=526
   |botomian=522
   |toyonian|late early cambrian|upper early cambrian|upper lower cambrian=516
   |cambrian stage 4|stage 4=515
   |middle cambrian|early middle cambrian|mid cambrian|series 3|cambrian series 3|cambrian stage 5|stage 5|st davids=513
   |drumian=506.5
   |guzhangian|nganasanian|mindyallan=503
   |merioneth|furongian=501
   |late cambrian|upper cambrian|paibian|franconian<!--unofficial and approximate!-->=499
   |upper upper cambrian|late late cambrian|mansian=490<!--Arbritary number.-->
      | ordovician|early ordovician|lower ordovician|tremadocian=488.3
      | late early ordovician=479
      | arenig|floian=478.6
      |dapingian|middle ordovician|mid ordovician|ordovician iii|early middle ordovician=471.8
      | darriwilian=468.1
      |late ordovician|upper ordovician|ordovician v|sandbian|early late ordovician=460.9
      | ordovician vi|katian=455.8
      | hirnantian=445.6
      | middle late ordovician=455
      | silurian|early silurian|lower silurian|llandovery|rhuddanian=443.7
        |aeronian=439
        |telychian=436
      | wenlock|sheinwoodian=428.2
      |homerian=426.2
      |late silurian|upper silurian|ludlow|gorstian=422.9
      |ludfordian=421.3
      | pridoli|unnamed pridoli stage=418.7
        | devonian|early devonian|lower devonian|lochkovian|downtonian<!--approx-->=416
      | pragian|praghian=411.2
        | emsian=407
      |middle devonian|mid devonian|eifelian=397.5
      | givetian=391.8
      |late devonian|upper devonian|frasnian=385.3
      | famennian=374.5
      | early carboniferous|lower carboniferous|carboniferous|mississippian|early mississippian|lower mississippian|tournaisian=359.2
      | middle mississippian|visean=345.3
      | late mississippian|serpukhovian=326.4
      | namurian=326
      | upper carboniferous|late carboniferous|pennsylvanian|early pennsylvanian|lower pennsylvanian|bashkirian=318.1
      | westphalian = 313
      | middle pennsylvanian|moscovian=311.7
        | late pennsylvanian|kasimovian=306.5
      |stephanian=304
      |gzhelian=303.9
        | permian|early permian|lower permian|cisuralian|asselian=299
      | sakmarian=294.6
      | artinskian=284.4
      | kungurian=275.6
      | guadalupian=272.5
      |middle permian|mid permian|roadian|ufimian=270.6
        | wordian=268
      | capitanian=265.8
      |late permian|upper permian|lopingian|wuchiapingian|longtanian=260.4
      | changhsingian=253.8
        |mesozoic|triassic|early triassic|lower triassic|induan=251
      | olenekian|spathian=249.7
        |middle triassic|mid triassic|anisian=245
          | ladinian=237
          |late triassic|upper triassic|carnian=228
        | norian=216.5
      | rhaetian=203.6
      | jurassic|early jurassic|lower jurassic|hettangian=199.6
        | sinemurian=196.5
      | pliensbachian=189.6
        | toarcian=183
        |middle jurassic|mid jurassic|aalenian=175.6
        | bajocian=171.6
      | bathonian=167.7
        | callovian=164.7
        |late jurassic|upper jurassic|oxfordian=161.2
        | kimmeridgian=155.7
        | tithonian=150.8
        | cretaceous|early cretaceous|lower cretaceous|berriasian|neocomian=145.5
        | valanginian=140.2
        | hauterivian=136.4
        | barremian|gallic=130
          | aptian=125
          | albian=112
       |late cretaceous|upper cretaceous|cenomanian=99.6
       | turonian=93.5
         | coniacian|senonian=89.3
       | santonian=85.8
       | campanian=83.5
       | maastrichtian=70.6
       |cenozoic|paleogene|paleocene|early paleocene|lower paleocene|tertiary|danian=65.5
       | puercan=65
       | torrejonian=63.3
       | middle paleocene|selandian=61.7
       | tiffanian=60.2
       | late paleocene|thanetian=58.7
       | clarkforkian=56.8
       |eocene|early eocene|lower eocene|ypresian|mp 10=55.8
       |wasatchian=55.4
       |bridgerian=50.3
       | middle eocene|lutetian|mp 11=48.6
       |uintan=46.2
       |duchesnean=42
       |bartonian=40.4
       |chadronian=38
       | late eocene|priabonian=37.2
       |oligocene|early oligocene|lower oligocene|rupelian|orellan=33.9
       |whitneyan=33.3
       |arikeean=30.6
       | late oligocene|chattian=28.4
     | neogene|miocene|early miocene|lower miocene|aquitanian=23.03
     |hemingfordian=20.6
     |burdigalian=20.43
     |barstovian=16.3
     | middle miocene|langhian=15.97
     |serravallian=13.65
     |clarendonian=13.6
   | late miocene|tortonian=11.608
     |hemphillian=10.3
    |messinian=7.246
    |pliocene|early pliocene|lower pliocene|zanclean=5.332
    |blancan=4.75
      | late pliocene|piacenzian=3.600
    |pleistocene|early pleistocene|lower pleistocene|gelasian=2.588
    |calabrian=1.806
    |irvingtonian=1.8
    | middle pleistocene=0.781
    |rancholabrean=.24
    | late pleistocene=0.126
|quaternary=2.588<!-- ratified in doi:10.1002.2Fjqs.1338-->
|holocene=0.01143

|now|recent|present|current=0}} round {{{2|5}}}}}</includeonly><noinclude>{{توضیحات}}</noinclude>