Triassic 248 mya

• Dinosaurs appear 
• First crocodiles and mammals appear
• Modern corals and fish 

Jurassic 206 mya

• Lots lots of different dinosaurs
• Ferns and cone bearing plants
• Mammals common but small 
• First birds and animals 
• Land mass,Pangaea breaks up into Gondwanaland and Laurasia
• High carbon dioxide levels 

Cretaceous 144 mya

• Lots of dinosaurs including Tyrannosaur 
• New types of insects 
• Flowering plants appear and become plentiful 
• Modern crocodiles and sharks
• Early birds appear 
• Gondwanaland breaks up
• Rocky Mountains appear
• Carbon dioxide similar to today

Paleogene 65 mya

• Modern plants
• Lots of different mammals 
• Dinosaurs extinct 
• Primitive whales
• First grasses
• Rapid changes in mammals 
• Climate cools
• Ice age begins and ends in this period