Not Finding Your Answer?
Post It On KidzTalk Homework Help
Post It On KidzTalk Homework Help
Report a search problem
mobile version
Copyright 2005-2024 KidzSearch.com
The Archaean (or Archean) eon is the geological period after the Hadean and before the Proterozoic. It is one of the four main time periods (eons) of Earth history. The Archaean lasted from 4,000 million years ago (mya) to 2,500 mya. It contains the first sedimentary rocks, and the first fossil life forms, which were cyanobacteria, and acritarchs.