from Wiktionary, Creative Commons Attribution/Share-Alike License.
- adjective geology Of a
geologic erawithin the Archaean eonfrom about 3600 to 3200 million years ago; the first aerobic bacteriaappeared at this time.
- proper noun geology The Paleoarchean era.
Sorry, no etymologies found.
The auroral intensity is brighter due to solar wind densities many times greater than those today, and the dominant color reflects greater energies of the precipitating particles and the mildly reducing Paleoarchean atmosphere.