古原生代
Categories:
- Japanese terms spelled with 古 read as こ
- Japanese terms spelled with 原 read as げん
- Japanese terms spelled with 生 read as せい
- Japanese terms spelled with 代 read as だい
- Japanese terms read with on'yomi
- Japanese lemmas
- Japanese proper nouns
- Japanese terms spelled with second grade kanji
- Japanese terms spelled with first grade kanji
- Japanese terms spelled with third grade kanji
- Japanese terms with 4 kanji
- Japanese terms suffixed with 代
- ja:Geology
- ja:Time