Devonian: Age of Fishes
A time of great transition. In the sea ammonoids and fish evolve and quickly diversify. On land trees and forests appear for the first time. The first insects, spiders, and amphibians evolve.
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Devonian: Overview
The Rhynie Chert in Scotland is a Devonian age deposit containing fossils of both Zosterophyllophytes and Trimerophytes, the two major lines of vascular plants. This indicates that prior to the start of the Devonian, the first major radiations of the plants had already happened. The oldest known vascular plants in the Northern Hemisphere are Devonian.
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Devonian: 'Infoplease.com'
Devonian period , fourth period of the Paleozoic era of geologic time between 408 and 360 million years ago (see Geologic Timescale, table). It was named (1838) by the geologists Sir Roderick Impey Murchison and Adam Sedgwick for Devonshire, England, where they first investigated rocks formed during the period. The Devonian period was a time of great tectonic activity, as Laurasia and Gondwanaland drew closer together. Pangaea began to consolidate the plates containing North America and Europe (see plate tectonics), further raising the northern Appalachian Mountains and forming the Caledonides in Britain and Scandinavia.
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Devonian: Biological and Geological Changes
During the Devonian, there were three major continental masses: North America and Europe sat together near the equator, much of their current land underneath seas. To the north lay a portion of modern Siberia. A composite continent of South America, Africa, Antarctica, India, and Australia dominated the southern hemisphere.
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