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The Clue

Unit in a geology book (4 letter answer)

The Answer

AEON

Tags

Notes

The answer AEON is seen frequently, appearing about once every 110 puzzles.

Related Clues

Ages
Eternity
Ages and ages
Big time?
A billion years
Boundless time
Coon's age
Countless years
Eras on end
Extended period
Geological period
Incomprehensible age
Indefinite period
Interminable time
It goes on and on and on
Long period
A long time
Long time
Lots of time
Many millennia
Many millenniums
Quite a stretch
Seemingly forever
Time unlimited
Age beyond belief
Ages upon ages
Billion-year period
Endless time period
Epochs upon epochs
Immeasurably long period
Long long time
Long, long time
Long time period
Time in earth's history
Time without end
Very long time
___ Flux (Charlize Theron role)
Time spent in line, seemingly

Definition

AEON as a noun:

1. (eon, aeon) = (Gnosticism) a divine power or nature emanating from the Supreme Being and playing various roles in the operation of the universe
2. (eon, aeon) = the longest division of geological time
3. (eon, aeon) = an immeasurably long period of time; "oh, that happened eons ago"