Article
Article
Silurian
Article By:
Berry, William B. N. Museum of Paleontology, University of California, Berkeley, California.
Last reviewed:January 2020
DOI:https://doi.org/10.1036/1097-8542.623600
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The third oldest period of the Paleozoic Era, spanning an interval from about 444 to 419 million years ago (MYA). The Silurian system includes all sedimentary rocks deposited and all igneous and metamorphic rocks formed in the Silurian Period (Fig. 1). Both the base and top of the Silurian have been designated by international agreement at the first appearances of certain graptolite species in rock sequences at easily examined and well-studied outcrops. See also: Geologic time scale
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