時代別 Geological Age


先カンブリア時代 Precambrian

古生代 Paleozoic Era
 カンブリア紀 Cambrian Period
 オルドビス紀 Ordovician Period
 シルル紀 Silurian Period
 デボン紀 Devonian Period
 石炭紀 Carboniferous Period
 ペルム紀 Permian Period

中生代 Mesozoic Era
 三畳紀 Triassic Period
 ジュラ紀 Jurassic Period
 白亜紀 Cretaceous Period

新生代 Cenozoic Era
 古第三紀 Paleogene Period・新第三紀 Neogene Period
 第四紀 Quaternary Period


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