Plants became widespread. And the first vertebrate animals colonized land. In the Paleozoic Era, life flourished in the seas. After the Cambrian Period came the 45-million-year Ordovician Period ...

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 ...

It was the third period in the Paleozoic Era. It followed the Ordovician Period ... of extensive reef building and the first signs that life beginning to colonize the new estuary, fresh water ...

Dating to the late Paleozoic Era ... of life throughout those 15 million years, but the new discovery suggests it was a particularly experimental time for the evolution of large forest plants ...

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 ...

The Devonian, part of the Paleozoic era ... horsetails, and seed plants had also appeared. The new life burgeoning on land apparently escaped the worst effects of the mass extinction that ended ...