Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- proper noun The second of the three
Martian geologic epochs, approximately from 3,500 million years ago to 1,800 million years ago, marked bylava flows , preceded by theNoachian epoch , and followed by theAmazonian epoch .
Etymologies
from Wiktionary, Creative Commons Attribution/Share-Alike License
Named for the Hesperia Planum
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