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:June 2016
Show previous versions
- Lithofacies and paleogeography
- Biogeography and ocean currents
- Sea-level changes
- Links to Primary Literature
- Additional Readings
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
The content above is only an excerpt.
for your institution. Subscribe
To learn more about subscribing to AccessScience, or to request a no-risk trial of this award-winning scientific reference for your institution, fill in your information and a member of our Sales Team will contact you as soon as possible.
to your librarian. Recommend
Let your librarian know about the award-winning gateway to the most trustworthy and accurate scientific information.
AccessScience provides the most accurate and trustworthy scientific information available.
Recognized as an award-winning gateway to scientific knowledge, AccessScience is an amazing online resource that contains high-quality reference material written specifically for students. Contributors include more than 9000 highly qualified scientists and 43 Nobel Prize winners.
MORE THAN 8500 articles and Research Reviews covering all major scientific disciplines and encompassing the McGraw-Hill Encyclopedia of Science & Technology and McGraw-Hill Yearbook of Science & Technology
115,000-PLUS definitions from the McGraw-Hill Dictionary of Scientific and Technical Terms
3000 biographies of notable scientific figures
MORE THAN 19,000 downloadable images and animations illustrating key topics
ENGAGING VIDEOS highlighting the life and work of award-winning scientists
SUGGESTIONS FOR FURTHER STUDY and additional readings to guide students to deeper understanding and research
LINKS TO CITABLE LITERATURE help students expand their knowledge using primary sources of information