3 min read During the Ordovician period, part of the Paleozoic era, a rich variety of marine life flourished in the vast seas and the first primitive plants began to appear on land—before the ...

The Paleozoic era's Silurian period saw animals and plants ... these were relatively minor compared with those of other geologic periods.

The names Paleozoic, Mesozoic, and Cenozoic all describe the types of fossils that have been found relating to those periods. In the Mesozoic Era, there are fossils that represent both extinct ...

It significantly shaped the two periods of time that made up the end of the Paleozoic era. First, it led to the creation of iconic "coal forests" full of giant insects in the Carboniferous period ...

The Environment of Vertebrate Life in the Late Paleozoic in North America: A Paleogeographic Study. By Prof. E. C. Case. (Publication No. 283.) Pp. vi + 273. (Washington: Carnegie Institution of ...