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An epoch in the evolution of plants, proposed in 1993 by J. Gray, that lasted from the late Lochkovian (about 411 Ma) in the Early Devonian until the middle Permian (about 265 Ma). During this time the diversity of spores and plant megafossils increases greatly, with several classic assemblages, and a marked increase in the diversity of vascular plants.

Subjects: Earth Sciences and Geography.

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