WALTER MYERS / SCIENCE PHOTO LIBRARY WALTER MYERS / SCIENCE PHOTO LIBRARY
Prehistoric wetland life. Computer artwork of an Ichthyostega (right) emerging from a prehistoric floodplain around 350 million years ago during the Late Devonian period, in what is now the Canadian Arctic. On the left is a four-foot tall Rhacophyton ceratangium, an ancient shrub thought to be one of the earliest ferns. On the horizon are Archaeopteris and Lycopsid trees.
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