Devonian

Disambiguation: Devonian is also an adjective relating to the English county of Devon or the people there.

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The Devonian is a geologic period of the Paleozoic era.

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During the Devonian Period the first fish evolved legs and started to walk on land as amphibians, and the first arthropods like insects and spiders also started to colonize terrestrial habitats. The first seed-bearing plants spread across dry land, forming huge forests. In the oceans, fish diversified into the first sharks, and the first lobe-finned and bony fish. The first ammonite mollusks appeared, and trilobites, the mollusk-like brachiopods, as well as great coral reefs were still common. The Late Devonian extinction severely impacted marine life. The paleogeography was dominated by the supercontinent of Gondwana to the south, the continent of Siberia to the north, and the early formation of the small supercontinent of Euramerica in the middle.

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Geologic period: REDIRECT Geologic time scale#Terminology...

Paleozoic: The Paleozoic is a major division of the geologic timescale, one of four geologic eras. The division of time into eras, the largest division of geologic time, dates back to Giovanni Arduino in the 18th century, although his original name for the era now called the Paleozoic was "Primitive". (See Ter...

Fish: : This page is about the animals. For other meanings, please see Fish (disambiguation)....