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| Cambrian |
of, relating to, or designating the geological period at the start of the Paleozoic Era, from approximately 600 million to 500 million years ago, when marine animals such as trilobites were in abundance. [1/2 definitions] |
| carboniferous |
(cap.) of, relating to, or designating the geological time period between the Devonian and Permian of the Paleozoic Era, from approximately 350 million to 280 million years ago, when the warm damp climate produced many forests that later formed rich coal deposits. [1/3 definitions] |
| 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] |
| Mesozoic |
of, relating to, or designating the geological era between the Paleozoic and the Cenozoic, from approximately 220 million to 65 million years ago, when dinosaurs appeared and became extinct and ferns were abundant. [1/2 definitions] |
| Mississippian |
of, relating to, or designating the first coal-forming period of the Paleozoic Era, from approximately 350 million to 320 million years ago, when land areas increased and winged insects developed; Lower Carboniferous. [1/4 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] |
| Paleozoic |
the Paleozoic Era, or the rock formations that date from that time. [1/2 definitions] |
| Pennsylvanian |
of, relating to, or designating the second coal-forming period of the Paleozoic Era, from approximately 320 million to 280 million years ago, when swamp forests were abundant and large reptiles appeared; Upper Carboniferous. [1/4 definitions] |
| Permian |
of, relating to, or designating the last geological period of the Paleozoic Era, from approximately 280 million to 220 million years ago, when reptiles became prominent, major mountain ranges such as the Appalachians formed, and great glaciers appeared in the Southern Hemisphere. [1/2 definitions] |
| seed fern |
a fernlike Paleozoic plant, now extinct, that bore naked seeds upon its leaves. |
| Silurian |
of, relating to, or designating the geological period between the Ordovician and Devonian of the Paleozoic Era, from approximately 440 million to 400 million years ago, when coral reefs began forming and land plants and air-breathing animals appeared. [1/2 definitions] |
| trilobite |
any of numerous extinct arthropods of the Paleozoic era that had laterally segmented external skeletons divided into three lengthwise lobes along the back. |
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