Babcock, Loren E. Department of Geological Sciences, Ohio State University, Columbus, Ohio.
Last reviewed:May 2016
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The uppermost eonothem (a time-stratigraphic unit composed of rocks formed during an eon of geologic time) of the Standard Global Chronostratigraphic Scale. The Phanerozoic Eonothem is the physical stratigraphic representation of the Phanerozoic Eon, a geologic time unit, embracing the Paleozoic, Mesozoic, and Cenozoic eras (Fig. 1). Phanerozoic time, which extends from 541 million years ago to the present, is estimated to be slightly less than 12% of the Earth's history. See also: Geologic time scale; Stratigraphy
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