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Geologic age

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Possible Answers:

EON.

Last seen on: LA Times Crossword, Wed, May 3, 2023

Random information on the term “Geologic age”:

The law of superposition is an axiom that forms one of the bases of the sciences of geology, archaeology, and other fields pertaining to geological stratigraphy. In its plainest form, it states that in undeformed stratigraphic sequences, the oldest strata will lie at the bottom of the sequence, while newer material stacks upon the surface to form new deposits over time. This is paramount to stratigraphic dating, which requires a set of assumptions, including that the law of superposition holds true and that an object cannot be older than the materials of which it is composed. To illustrate the practical applications of superposition in scientific inquiry, sedimentary rock that has not been deformed by more than 90° will exhibit the oldest layers on the bottom, thus enabling paleontologists and paleobotanists to identify the relative ages of any fossils found within the strata, with the remains of the most archaic lifeforms confined to the lowest. These findings can inform the community on the fossil record covering the relevant strata, to determine which species coexisted temporally and which species existed successively in perhaps an evolutionarily or phylogenetically relevant way.

Geologic age on Wikipedia

Random information on the term “EON”:

The word aeon /ˈiːɒn/, also spelled eon (in American and Australian 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 ancient Greek word ὁ αἰών (ho aion), from the archaic αἰϝών (aiwon) meaning “century”. In Greek, it literally refers to the timespan of one hundred years. Its latest meaning is more or less similar to the Sanskrit word kalpacode: san promoted to code: sa and Hebrew word olamcode: heb promoted to code: he . 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 thousand million 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

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