archaeozoic

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1. Archeozoic.

adjective

1. noting or pertaining to the earlier half of the Precambrian Era, from about 5 billion to 2.5 billion years ago, during which the earliest datable rocks were formed and from which the oldest known fossil forms, blue-green algae and bacteria, have been recovered.

noun

2. the Archeozoic division of geologic time or the rock systems formed then.

adjective

1. a former word for Archaean

adjective

1. a variant spelling (esp US) of Archaeozoic

1. Another spelling of Archeozoic.

1. See Archean.

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