Supereon
Full definition of supereon
Noun
supereon
(plural supereons)- (geology) A time period encompassing more than one eon, principally used to characterize the Precambrian.
- 2015, Charles S. Cockell, Astrobiology: Understanding Life in the Universe, Sometimes the Hadean, Archean and Proterozoic are lumped together in a supereon called the Precambrian.