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 • Image Gallery
During the Silurian and Devonian Periods, Earth’s barren landscape was turning green with life. New plants were colonizing dry land and creating habitats for trailblazing animals that were just beginning to emerge from the water.
In the seas, life flourished as temperatures warmed. Fishes diversified in the deep. Massive reefs sprawled across tropical sea floors. From this rich diversity of life in the waters, animals—including the first tetrapods (four-limbed vertebrates)—were taking their first steps using limbs that were once fins.
Scientists learn much about life during the Silurian and Devonian Periods through a number of specimens and fossils.
Continue to The First Land Plant Images. >>
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