|1.||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|
|2.||of or relating to Devon|
|3.||the Devonian the Devonian period or rock system|
|portion of the earth's surface consisting of disintegrated rock and humus|
|central portion of the earth believed to be composed mainly of iron and nickel in a molten state|
|Devonian (dĭ-vō'nē-ən) Pronunciation Key
The fourth period of the Paleozoic Era, from about 408 to 360 million years ago. During this time there were three major landmasses: most of modern day North America and Europe were located along the equator; a portion of Siberia was located to the north; and a continent consisting of South America, Australia, Africa, India, and Antarctica was located in the Southern Hemisphere. In the early Devonian small plants dominated the landscape, but by the end of the Devonian ferns and seed plants had appeared, as had the first forests. The first tetrapods (terrestrial vertebrates) and terrestrial arthropods appeared, as did many new types of fish. See Chart at geologic time.