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| Devonian |
of, relating to, or designating the geological period between the Silurian and the Carboniferous of the Paleozoic Era, from approximately 400 million to 350 million years ago, when large trees and amphibians appeared and fish were in great abundance. [1/2 definitions] |
| Ordovician |
of, relating to, or designating the geological period between the Cambrian and Silurian of the Paleozoic Era, from approximately 500 million to 440 million years ago, when marine invertebrate animals were abundant. [1/2 definitions] |
| Silurian |
the Silurian Period, or the rock formations that date from that time. [1/2 definitions] |
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