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t-shirts prehistoric t-shirts flora t-shirts plant t-shirts fauna t-shirts paleobotany t-shirts palaeobotany t-shirts prehistoric life t-shirts prehistory t-shirts devonian period t-shirts middle devonian t-shirts age of fishes t-shirts paleozoic era t-shirts paleozoic t-shirts paleontology t-shirts paleobiology t-shirts

photographs prehistoric photos flora photos plant photos fauna photos paleobotany photos palaeobotany photos prehistoric life photos prehistory photos devonian period photos middle devonian photos age of fishes photos paleozoic era photos paleozoic photos paleontology photos paleobiology photos

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Devonian is the fourth period of the Paleozoic Era, encompassing an interval of geologic time between 418 and 362 million years before present based on radiometric data. The Devonian System encompasses all rocks deposited or formed during the Devonian Period. The Devonian is customarily divided into Lower, Middle, and Upper series and their corresponding epochs. The great diversification and radiation of fish in the Devonian has led to the term "Age of Fishes" for the period.