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Devonian
(redirected from Devonian System)

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Devonian
Geology of, denoting, or formed in the fourth period of the Palaeozoic era, between the Silurian and Carboniferous periods, lasting 60–70 million years during which amphibians first appeared
Devonian [di′vō·nē·ən]
(geology)
The fourth period of the Paleozoic Era, covering the geological time span between about 412 and 354 × 106years before present.
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Alberta Society Petroleum Geologists, International Symposium on the Devonian System 1:833-971.
The New Harmony Group (Lower devonian) revisited by Horowitz, Alan S. / Proceedings of the Indiana Academy of Science
The Devonian System is represented by the Mackinac Breccia, which is composed of fragmented shale, limestone, and dolomite from formations of the Upper Silurian and Lower Devonian.
Bedrock Geology of Mackinac County, Michigan by BROWN, LEWIS M.; LEACH, MELANIE A.; REXROAD, CARL B.; RIBANT, MICHELLE; LIEURANCE, SUZANNE; SMITH, C / Michigan Academician
 
 
 
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