Early Devonian Epoch

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Early Devonian map

Devonian paleogeography

Devonian Period

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Early Devonian Epoch

geochronology

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fossil record of apterygotes

In apterygote: Evolution and paleontology
…the Rhynie chert of the Early Devonian (approximately 419 million to 393 million years ago) sandstone of Scotland. Other species known from the Baltic amber include one campodeid dipluran. The extinct order Monura includes two species, Dasyleptus lucasi of the Late Carboniferous (323 million to 299 million years ago) of…
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subdivision of Devonian Period

In Devonian Period: Vertebrates
The Early Devonian saw the entry of jawed forms or gnathostomes, and the armoured forms of these, the placoderms, characterize the epoch. The arthrodires, which had a hinged frontal armour in two portions, and the grotesque antiarchs belong here. The close of the Devonian saw the…
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