Geologic Time: The Paleozoic The Paleozoic is the earliest era of the Phanerozoic. It started around 550 million years ago and lasted approximately 300 million years http: //anthropology.si.edu/humanorigins/faq/gt/pal...
Paleozoic Paleozoic Era http: //es-designs.com/geol105/timescale/paleoz...
The Paleozoic Era The Paleozoic is bracketed by two of the most important events in the history of animal life. At its beginning, multicelled animals underwent a dramatic "explosion" in diversity http: //ucmp.berkeley.edu/paleozoic/paleozoicst...
Dinosaurs