1. Paleoarchean - Adjective
2. Paleoarchean - Proper noun
Paleoarchean (not comparable)
(geology) Of a geologic era within the Archaean eon from about 3600 to 3200 million years ago; the first aerobic bacteria appeared at this time.
Paleoarchean
(geology) The era from 3,600 Ma to 3,200 Ma.