The T. rex is practically the 'mascot' of the Mesozoic Era, and the woolly mammoth the 'mascot' of the Cenozoic. What would you consider to be the 'mascot' of the Paleozoic Era?
(art by Alena Hovorkova)
(art by Alena Hovorkova)
(art by Alena Hovorkova)
(art by Alena Hovorkova)