created sense approved 元古宙 · yuángǔzhòu · Proterozoic — "Initial import from upstream dictionary"
元古宙
yuángǔzhòu
Proterozoic
the Proterozoic Eon, a geological eon from approximately 2500 to 541 million years ago (following the Archean and preceding the Phanerozoic)
元 (literal) → 元 · yuán · eon 古 (literal) → 古 · gǔ · ancient 宙 (literal) → 宙 · zhòu · eon
Changed: simplified, traditional, gloss, definition, pinyin, variant pinyin, variants, separable parts, decomposition