Geologic time

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Possible Answers:

EON.

Last seen on: LA Times Crossword 25 Nov 21, Thursday

Random information on the term “Geologic time”:

The Hadean ( /ˈheɪdiən, heɪˈdiːən/ HAY-dee-ən, hay-DEE-ən) is a geologic eon of Earth history preceding the Archean. It began with the formation of the Earth about 4.6 billion years ago and ended, as defined by the International Commission on Stratigraphy (ICS), 4 billion years ago. As of 2016[update], the ICS describes its status as “informal”. The term was coined after the Greek mythical underworld Hades, by American geologist Preston Cloud, originally to label the period before the earliest-known rocks on Earth. W. Brian Harland later coined an almost synonymous term, the Priscoan Period, from priscus, the Latin word for ‘ancient’. Other, older texts refer to the eon as the Pre-Archean.

“Hadean” (from Hades, the Greek god of the underworld, and the underworld itself) describes the hellish conditions then prevailing on Earth: the planet had just formed and was still very hot owing to its recent accretion, the abundance of short-lived radioactive elements, and frequent collisions with other Solar System bodies.

Geologic time on Wikipedia

Random information on the term “EON”:

The word aeon /ˈiːɒn/, also spelled eon (in American English), originally meant “life”, “vital force” or “being”, “generation” or “a period of time”, though it tended to be translated as “age” in the sense of “ages”, “forever”, “timeless” or “for eternity”. It is a Latin transliteration from the koine Greek word ὁ αἰών (ho aion), from the archaic αἰϝών (aiwon). In Homer it typically refers to life or lifespan. Its latest meaning is more or less similar to the Sanskrit word kalpa and Hebrew word olam. A cognate Latin word aevum or aeuum (cf. αἰϝών) for “age” is present in words such as longevity and mediaeval.

Although the term aeon may be used in reference to a period of a billion years (especially in geology, cosmology and astronomy), its more common usage is for any long, indefinite period. Aeon can also refer to the four aeons on the geologic time scale that make up the Earth’s history, the Hadean, Archean, Proterozoic, and the current aeon, Phanerozoic.

EON on Wikipedia