The Paleozoic era began about 543 million years ago. It came after the Precambrian era and before the Mesozoic era.
291,000,000 years
The Paleozoic Era of Earth's history lasted from around 542 to 251 million years ago.
(In order from oldest period to youngest)Cambrian- 54 million yearsOrdovician- 44 million yearsSilurian- 28 million yearsDevonian- 57 million yearsCarboniferous- 60 million yearsPermian- 48 million...
How long a pierod of time is. For instence, the Tudor era lasted from 1485 to 1603.