Johnson, James G. Formerly, Department of Geology, Oregon State University, Corvallis, Oregon.
Heckel, P. H. Department of Geology, Oregon State University, Corvallis, Oregon.
Over, D. Jeff Department of Geological Sciences, State University of New York, Geneseo, New York.
Last reviewed:November 2019
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- Lithofacies and paleogeography
- Biogeography and ocean currents
- Sea-level changes
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The geologic period and system of the Paleozoic Era from the end of the Silurian Period to the beginning of the Carboniferous Period. The Devonian Peroid encompasses an interval of geologic time between 419 and 359 million years ago (MYA) based on radiometric data (Fig. 1). The Devonian System encompasses all sedimentary rocks deposited, and all igneous and metamorphic rocks formed, during the Devonian Period. It is conventional that recognition of Devonian time is determined by the definition of Devonian rocks. See also: Paleozoic
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