Disambiguation: "Devonian" is sometimes used to refer to the Southwestern Brythonic language, and the people of the county of Devon are sometimes referred to as "Devonians"
The Devonian is a geologic period of the Paleozoic era. It is named after Devon, England, where rocks from this period were first studied.
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 mollusc-like brachiopods, as well as great coral reefs were still common. The Late Devonian extinction severely affected 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.
More on [ Devonian ]

Devonian Geography - Description and maps of the continents as they existed at the time.
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Dunkleosteus - An article about one of the most well known Devonian fish.
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Lecanocrinus and Taxocrinus in the Czech Republic - Detailed description, with references, of 2 Devonian crinoids.
Palaeozoic Forests - A description of the colonization of the land by vascular plants and the formation of the first forests in the Devonian.
Sarcopterygii - A cladistic diagram, with extensive references to scientific papers on the subject.
Sarcopterygii - A description of the lobe-finned fish which first appeared in the early Devonian and had mostly died out by the end of the period.
The Devonian - An overview of the period from the UC Berkeley Museum of Paleontology.
The Red Hill Story - A description of this location, with maps showing its position on the Laurussian continent.
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