second Era of the Archean Eon
The Palaeoarchaean (Paleoarchean) is the second geological era in the Archaean. It began 3.6 billion years ago and ended at 3.2 billion years ago. Before it was the Eoarchaean and after it was the Mesoarchaean.
- "International Chronostratigraphic Chart" (PDF). International Commission on Stratigraphy. Retrieved 6 July 2013.