second era of the Archean eon
The Palaeoarchaean (Paleoarchean) is the second geological era in the Archaean eon. It began 3.6 billion years ago and ended 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.