始太古代

Shǐtàigǔ Dài
  1. (geology) the Eoarchean era (part of the Archean eon, spanning from 4 to 3.6 billion years ago)
  2. the Eoarchean era (part of the Archean eon, spanning from 4 to 3.6 billion years ago)

Wiktionary

Entry Composition

1 始 shǐ
  1. to begin
  2. to start
  3. then
  4. only then
2 太古代 Tàigǔdài Archaeozoic (geological era before 2500m years ago)