The word 'eons' is correct and usable in written English.
You can use 'eons' to refer to a very long period of time, especially in a metaphorical sense. For example: She had lived in the same small town for eons.
But, hopefully, the insurance population will never have to be used, hopefully these bizarre beings will continue swimming in their little mountaintop lake for eons to come, gobbling up whatever gets too close and beguiling us with their many chromosomes.
For eons, the planet veered wildly between extremes, impersonating a range of celestial bodies.
The completion of the often speculated nine-film series has been a holy grail for fans for eons.
Past time on Earth, as inferred from the rock record, is divided into four immense periods of time called eons.
The genealogical tree of this spiritual lineage begins with the seven buddhas, consisting of six mythological Buddhas of previous eons as well as Siddhartha Gautama, or Shakyamuni, the historical Buddha of the current age.
Three eons are recognized: the Phanerozoic Eon (dating from the present back to the beginning of the Cambrian Period), the Proterozoic Eon, and the Archean Eon.
Such biostratigraphic boundaries separate larger or smaller units of time that are defined as eons, eras, periods, epochs, and ages.
The recorded history of the Precambrian, which covers more than 80 percent of Earth's geologic history, is divided into two eons: the Archean, between roughly 4 and 2.5 billion years ago, and the Proterozoic, between 2.5 billion and 541 million years ago.
In geologic terms, Asia comprises several very ancient continental platforms and other blocks of land that merged over the eons.
Events that can take anywhere from hours to eons in real time can be simulated in a few minutes.
In formal usage, eons are the longest portions of geologic time (eras are the second-longest).
