WALTER MYERS / SCIENCE PHOTO LIBRARY WALTER MYERS / SCIENCE PHOTO LIBRARY
Prehistoric forest. Computer artwork of a forest of Calamites of varying size (10 to 50 feet tall) growing in lowlands near the brackish waters of a prehistoric inland sea during the Devonian period (around 370 million years ago). Closer to the ground, about 6 feet tall, are a variety of Drepanophycus plants, which preceded the Calamites by about 20 million years and coexisted with them for another 35 million years.
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