Precambrian

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See also: Pre-Cambrian

English[edit]

Alternative forms[edit]

Etymology[edit]

pre- +‎ Cambrian

Adjective[edit]

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Precambrian (not comparable)

  1. (informal, geology) Relating to the time and geology dated before the Phanerozoic

Translations[edit]

Proper noun[edit]

Precambrian

  1. (geology) 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[edit]

  • 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.

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Hyponyms[edit]

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Translations[edit]