Archaean

Archaean englanniksi

1. archaean

1. Of, or relating to the geologic eon from about 3,800 to 2,500 million years ago; comprises the Eoarchean, Paleoarchean, Mesoarchean and Neoarchean eras; marked by an atmosphere with little oxygen, the formation of the first continents and oceans and the emergence of simple life.

2. (quote-journal)

3. The eon from 2,500 Ma to 4,000 Ma.