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This site describes the Silurian period, a time during which the Earth underwent considerable changes that had important repercussions for the environment and life within it. The stratigraphy link describes the subdivisions of the period into four epochs. Each epoch is distinguished from the others by the appearance of new species of graptolites. Two other links lead to a detailed discussion of life during the period as well as information on the tectonics and paleoclimate of the Silurian.
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