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:: Home > The People > Biological Legacy: A timeline > Devonian Period


million years ago

400 Million Years Ago

Known as the Devonian Geologic Period by scientists, Oregon at this time was quite different than the Oregon we know today. It was fairly flat, since the Coast and Cascade ranges still hadn't formed. There were no land vertebrates— animals with backbones, like deer, elk, cougar, and humans— because vertebrate animals hadn't evolved to survive out of water. Only some primitive vertebrate fishes existed in the seas. But it the area now known as Oregon was above water, it was probably swampy, with dominant plants being fern-like in appearance. A giant ancestor of the modern-day horsetail may have been growing in this area.

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