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.