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Algonkian of, relating to, or designating the later of two geological periods of the Precambrian Era, from approximately 2.5 billion to 600 million years ago, when the first evidence of life appeared; Late Precambrian; Proterozoic. [1/4 definitions]
Archean of, relating to, or designating the earlier of two geological periods of the Precambrian Era, ending approximately 2.5 billion years ago, during which highly crystalline igneous and metamorphic rocks were formed; Early Precambrian; Archeozoic; azoic. [1/2 definitions]
cryptozoic (cap.) of or pertaining to Precambrian rock strata yielding few and very primitive fossils. [2/3 definitions]
Paleozoic of, relating to, or designating the geological era between the Precambrian and Mesozoic, from approximately 600 million to 220 million years ago, when the first fishes, amphibians, reptiles, insects, and land plants appeared. [1/2 definitions]
Precambrian the Precambrian Era, or the rock formations that date from that time. [1/2 definitions]