Geologic time

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Possible Answers: EPOCH.

Last seen on: LA Times Crossword 7 Nov 18, Wednesday

Random information on the term “Geologic time”:

The Hadean ( /ˈheɪdiən/) is a geologic eon of the Earth predating the Archean. It began with the formation of the Earth about 4.6 billion years ago and ended, as defined by the ICS, 4 billion years ago.[1] As of 2016[update], the ICS describes its status as “informal”.[2] Geologist Preston Cloud coined the term in 1972, originally to label the period before the earliest-known rocks on Earth.[3][4] W. Brian Harland later coined an almost synonymous term: the “Priscoan period”. Other, older texts simply 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.


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Since few geological traces of this eon remain on Earth, there is no official subdivision. However, the Lunar geologic timescale embraces several major divisions relating to the Hadean, so these are sometimes used in an informal sense to refer to the same periods of time on Earth.

Geologic time on Wikipedia

Random information on the term “EPOCH”:

Periodization is the process or study of categorizing the past into discrete, quantified named blocks of time[1]. This is usually done in order to facilitate the study and analysis of history, understanding current and historical processes, and causality that might have linked those events.

This results in descriptive abstractions that provide convenient terms for periods of time with relatively stable characteristics. However, determining the precise beginning and ending to any “period” is often arbitrary, since it has changed over time over the course of history.

To the extent that history is continuous and ungeneralizable, all systems of periodization are more or less arbitrary. Yet without named periods, however clumsy or imprecise, past time would be nothing more than scattered events without a framework to help us understand them. Nations, cultures, families, and even individuals, each with their different remembered histories, are constantly engaged in imposing overlapping, often unsystematized, schemes of temporal periodization; periodizing labels are continually challenged and redefined, but once established, a period “brand” is so convenient that many are “very hard” to change or shake off.

EPOCH on Wikipedia