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

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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.