Table of Geological Periods | Infoplease Proterozoic Age Crustaceous and Jurassic Table of Geological Periods http://www.infoplease.com/ipa/A0001822.html Tabela de Eras Geológicas http://www.infoplease.com/ipa/A0001822.html#ixzz2tPc3JpwP Table of Geological Periods | Infoplease.com Proterozoic Age good chart