古元古代

Gǔyuángǔ Dài
  1. (geology) the Paleoproterozoic era (part of the Proterozoic eon, spanning from 2.5 to 1.6 billion years ago)
  2. the Paleoproterozoic era (part of the Proterozoic eon, spanning from 2.5 to 1.6 billion years ago)

Wiktionary

Entry Composition

=1 古 Gǔ surname Gu
=1 古 gǔ
  1. ancient
  2. old
  3. paleo-
=1 古 gù
  1. (obsolete on its own in Standard Chinese) alternative form of 固 (gù)
  2. (obsolete on its own in Standard Chinese) alternative form of 故 (gù)
  3. alternative form of 固 (gù)
  4. alternative form of 故 (gù)
=1 古 kū
  1. (obsolete on its own in Standard Chinese) only used in 古成
  2. only used in 古成
2 元古代 Yuángǔdài Proterozoic (geological era 2500-540m years ago)