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(informal, geology) Relating to the time and geology dated before the Phanerozoic quotations
When you look at a Precambrian trilobite in the lobby of a New York bank, it is difficult to speculate about its primeval environment.
1981, William Irwin Thompson, The Time Falling Bodies Take to Light: Mythology, Sexuality and the Origins of Culture, London: Rider/Hutchinson & Co., page 209
(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.