The Ataroan (pron.: |ah-tah-roa-in| Japanese: あたる 'ataru', meaning "target")  is the earliest geologic period in the Archean and lasted from around 3,948 Mya (million years ago) to 3,865 Mya.

Events happening in the Ataroan Edit

  • By the end of the Ataroan, the continent of Vaalbara had formed.
  • The first archaebacteria had formed at this time.
  • Prokaryotes were the only organisms populating the Earth then.
  • The continent of Proto-Ur had formed.