411 REFERENCE · Wiktionary
Hesperian epoch
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Etymology
Named for the Hesperia Planum
Proper noun
The second of the three Martian geologic epochs, approximately from 3,500 million years ago to 1,800 million years ago, marked by lava flows, preceded by the Noachian epoch, and followed by the Amazonian epoch.
Further reading
Geology of Mars