noun, noun which may take the genitive case particle 'no'
Paleozoic era
Geological era spanning from about 541 to 252 million years ago. Used in scientific and educational contexts.
古生代には三葉虫が繁栄した。
Trilobites flourished during the Paleozoic era.
この化石は古生代の地層から発見された。
This fossil was discovered in Paleozoic strata.
Cenozoic era, the current geological era following the Mesozoic.
From 古 (こ, 'old') + 生 (せい, 'life') + 代 (だい, 'era'). A direct translation of the English term 'Paleozoic era'.