Chronostratigraphic division of the Mesozoic
Phanerozoic Eonothem
Cenozoic Erathem
Mesozoic Erathem
Upper Mesozoic
Cretaceous
Lower Mesozoic
Jurassic
Triassic
Paleozoic Erathem
Triassic = Three fold division of the system in Germany
Jurassic = Jura Mountaun, Swiss Alps
Cretaceous = Form the latin name for limestone


Summary of Mesozoic bioevents
Cretaceous
Invertebrates:
Extinction of ammonites, rudists, and most planktonic foraminifera (Protista) at the end of the Cretaceous
Ammonites and belemnoids continue to diversify
Rudist become major reef-builders

Vertebrates:
Extinction of dinosaurs, flying reptiles, and marine reptiles
Placental and marsupial mammals diverge
Plants:
Angiosperms evolve and diversify rapidly
Seedless plants and gymnosperms still common but less varied and abundant
Geology:
Further fragmentation of Pangaea
South America and Africa have separated
Australia separated from South American but remains connected to Antarctica

North American continues to open

Jurassic
Invertebrates:
Ammonites and belemnoid cephalopods increase in diversity
Rudist bivalves appear
Vertebrates:
First birds
Giant sauropod dinosaurs
Plants:
Seedless vascular plants and gymnosperms
Geology:
Fragmentation of Pangaea continues, close connections exist among all continents
Triassic
Invertebrates:
Survivors of the Permian extinction repopulate the sea 
Bivalves and echinoids expand into infaunal niche 
Vertebrates:
Mammals evolved from cynodonts
Cynodonts become extinct
Ancestral archosaur gives rise to dinosaurs

Flying reptiles and marine reptiles evolved

Plants:
Land flora of seedless vascular plants and gymnosperms as in Upper Paleozoic
Geology:
Fragmentation of Pangaea begins in the upper Triassic