Definitions for "PALEOZOIC ERA"
The earliest era of the Phanerozoic Eon, marked by the presence of marine invertebrates, fish, amphibians, insects, and land plants.
from 544 million to about 230 million years ago
The large division of geologic time between the Precambrian and Mesozoic Eras. It began about 570 million years ago and lasted until about 245 million years ago.