precambrian

IPA: prikˈæmbriʌn

(geology) The Precambrian supereon; spanning from the formation of the Earth around 4.6 billion years ago to the emergence of hard-shelled creatures 541 million years ago.

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

Examples of "precambrian" in Sentences

A fossil rabit unequivocally in the precambrian would of course have to be explained, but doing so would at the very least require some pretty massive changes to current theory.
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