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Precambrian - What does it mean?

precambrian | |

precambrian

English

Adjective

(wikipedia Precambrian) (-)
  • (informal, geology) Relating to the time and geology dated before the Phanerozoic

    • Proper noun

    (en proper noun)
  • The eon (or supereon) and rock formations dated before 541.0±1.0 million years ago, coinciding with the first appearance of the fossils of hard-shelled animals.

    • Usage notes

    * The (International Commission on Stratigraphy), which attempts to standardize the vocabulary of the field, is revising the boundaries between time periods based on physical-science methods rather than the kinds of fossils present. * The boundary between the Precambrian and the Phanerozoic has been changed from time to time and will be subject to change, as will the eons listed as Hyponyms below.

    Synonyms

    * (geological eon) Cryptozoic (archaic)

    Coordinate terms

    * (geological eon) Phanerozoic

    Hyponyms

    * (geological eon) Hadean, Archaean, Proterozoic - eons

    Not English

    has no English definition. It may be misspelled.