Periods 



Strata 



Organic History 



Terrace 



Clianiplah 



(Jlacial 



Man, Ass, Dog 



Bison, Stag, Beaver 

 Equus, Elephant, Hog 

 Racoon, Wolf, Ac. 



During the Tertiary a further elevation and denudation of Utah and Rocky Mountain region, and 

 further sinking of Pacific Ocean, both coining to the present time. Great sheets of lava flowed 

 from the Sierras, covering 150,000 square miles, some places 4,000 feet thick, at the end of the 



Tertiary and during Pliocene. 



Pliocene 



Miocene 



Eocene 





Pliohippus, Oreodou 



Pithecus Semnopithecus, 

 Phoca (Seal) 



Protohippus, Hipparion 



Great Lava Flow. Forma- 

 tion of Pacific Coast Chain 



All Orders of Insects 

 Monkeys, Rhinoceros 

 Hippopotamus 



Mesohippus, Tiger 

 Amphistegina replaces 



Nuinmelites 



Placental Mammals, Tapir 



Lemur, Marmosets, Ele- 

 phant and Mammoth-like 

 Animals, Bear, Camel 



Cetaceans 



Eohippus, the First Horse 

 Snakes Oak, Fig, Palm, Ac. 

 Bats, Opossums 

 Nuinmelites (Rhizopods) 



Elevation of the Korky and \Vahsatch Mountains above water. Elevation of the Mississippi Valley, 

 abolishment of the inter:. al sea of North Ameriea.and formation of lakes in the West. Nospecies 

 have survived this age of oscillation. Unconformity in Europe. Time (3,000x5,000), 15,000,000 years. 



Cretaceous 



End of Aninmnit iil;e 

 Wading Birds with Teeth 



Teliost Fishes, Ganoids, ho- 

 mocercal 



Angiosperms and Endogens 

 begin 



1, 



Klevation of Sierra and Cascade Ranges probably simultaneous with the formation of the 

 Cretaceous period. Sinking of the bed of the Pacific. 



Jurassic 



Trlassi. 



More Marsupials 



More Insects 



Great, Marine. Land and 



Flying Saurians 

 Bqualodont Sharks. Tier., 

 dactvlans. Belemniles, Am- 

 monites, More Marsupials. 



First Mammal, a Marsupial 



Ceratodus 



Bird-like Amphibians 



Beaked Saurians, Larertiai.s 



( 'erat it es ( Ammonitida) 



C\c:nls 



Fieuaa 71 



