cenozoic
	quaternary
	neogene
	paleogene
mesozoic era
* cretaceous
  - contients split into gondwana (south) and eurasia (north), 
    Trex is apex pred. in north america (immigrated from asia)
    triceratops
    tiranosaurs  first appeared in siberia

  - argentina: titanosaurus - saropods
  - europe: a bunch of islands: miniature versions of dinos
    flowering plants appear

* jurassic
  - dinosaurs ascendant, single continent (pangea)
    species are the same worldwide, birds appear, 
    sauropods - brahiosaurus, brontosaurus, diplodocus
    apex predator - allosaurus (no trex)

* triassic
  - crocodilians are on top of foodchain, dinosaurs and mammals appear
paleozoic
* permian
- permian dieoff: 10 mil long excessive vulcanism, 57%
  of terrestrial vertebrae, 96% of marine species, major dieoff of insects

	 ...
	 cambrian




- theropods
- sauropods
- ornithischia