Jisho

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こせいだい 古生代
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Noun, Noun which may take the genitive case particle 'no'
1. Paleozoic era​
Wikipedia definition
2. Paleozoic​The Paleozoic Era (from the Greek palaios, "old" and zoe, "life", meaning "ancient life") is the earliest of three geologic eras of the Phanerozoic Eon, spanning from roughly 542 to 251 million years ago (ICS, 2004). It is the longest of the Phanerozoic eras, and is subdivided into six geologic periods (from oldest to youngest): the Cambrian, Ordovician, Silurian, Devonian, Carboniferous, and Permian.
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