ocr: ume CHORT TIme- ERIOD Tme aGo IN EXaMPLE Name MILLION YEARS GNIMOLS RCTOCEOUS 65-136 GROUP 1 JURCISSIC Sr-90 GROUP 2 TRIOSSIC 91-225 GROUP S PCRLCIN 226-280 GROUP 4 CORBONIFCROUS 281-345 GROUP 5 DEVONLCIN 346-400 GROUP & SILURION 401-449 GROUP r ORDOVICION 441-500 GROUP a COMBRICN 501-570 GROUP E ITriceratops AStegosaurus SCoelophysis Pteranodon Pltosaurs Ammonttes Iguanodon Allosaurus Sauroctonus ADtadectes SAmphibians - - Coral Hitlerosaurusheganeura Ichthyostega Edaphosaurus Cockroaches Sea tltes 7Ftrst fish BJellyfish Osea tltes Ostracoderns SPUIYES Sponges Sea scorpionsOstracoderns Irtlob ...