Geology Timeline By huntmaster Jan 1, 2011 Cambrian 570-500 MYA 570-500 MYA Period: Jan 1, 2011 to Sep 15, 2011 Paleozoic Era Feb 18, 2011 Ordovician 490-443 MYA Mar 17, 2011 Silurian 443-416 MYA Apr 18, 2011 Actinopterygii first appeared 420 MYA Apr 20, 2011 Sarcopterygii first appeared 418 MYA Apr 23, 2011 Divonian 416-359 MYA May 15, 2011 Sarcopterygii thrived 385-299 MYA Jun 8, 2011 Carboniferous 359-299 MYA Jul 17, 2011 Permian 299-251 MYA Aug 6, 2011 Triassic 251-199 MYA Sep 15, 2011 Jurassic 199-145 MYA Period: Sep 16, 2011 to Dec 22, 2011 Mesozoic Era Nov 7, 2011 Crataceous 145-65 MYA Dec 22, 2011 Tertiary 65-23 MYA Period: Dec 23, 2011 to Dec 31, 2011 Cenozoic Era Dec 31, 2011 Quaternary 1.8 MYA