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Pre-cambrian
PRE-CAMBRIAN

Definitions:

i. The immense span of time in Earth's history from its formation to the beginning of the Cambrian Period.

ii. The earliest part of Earth's history, set before the current Phanerozoic Eon.

iii. An informal unit of geologic time, subdivided into three eons (Hadean, Archean, Proterozoic) of the geologic time scale.
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NOT APPLICABLE.


See perfect time (6).

See perfect specificity.

See perfect time (7).
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See perfect particularity (1).

See perfect earliness.

See perfect characteristic (1).

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