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The Silurian period of the Paleozoic era, 440-410 million years ago, follows the Ordovician period of the Paleozoic, "the age of ancient life." The Silurian was named by the R. I. Murchison in 1835 in honor of the Silure
| Era | Period | Epoch | Million Years Before Present |
| Paleozoic | Permian | 286 | |
| Pennsylvanian | 320 | ||
| Missipian | 360 | ||
| Devonian | 408 | ||
| Silurian | 438 | ||
| Ordovician | 505 | ||
| Cambrian | 570 |
tribe of Celts who had inhabited the Welsh borderlands where he first studied these rocks.
A long, warm, stable period followed the ice age and mass extinctions of the Ordovician, when over half of all previous life forms became extinct. Silurian fauna built upon the evolutionary patterns that had preceded it. No major new groups of invertebrates appeared, although a great radiation in number and form of existing invertebrates occurred. It has been said that the evolution of life cannot be separated from the evolution of the planet. In the Silurian, geologic trends greatly influenced...
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This section contains 649 words (approx. 3 pages at 300 words per page) |
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