Calamites are among the most abundant fossil plants of the Carboniferous period, and occur also in the Devonian.
The next period of the Palozoic is known as the Devonian age, or the age of fishes.
Chain corals became extinct at the close of the Silurian, but other corals were extremely common in the Devonian seas.
These amphibians are evidently the descendants of some of the fishes of the Devonian times.
Some of the forms reckoned as specific in the Devonian and Carboniferous formations may be really derivative races.
Herein we see the greater variety and richness of the Devonian.
Look at these old Devonian rocks, with their fossils as fresh as of yesterday.
By middle Devonian time these water areas had considerably expanded.
Equally strange is the fate of the great swimming Eurypterids which we saw in the Devonian.
The Devonian is, therefore, commonly called the “Age of Fishes.”
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.