330 



BIOLOGY FOR BEGINNERS 



Geological History 



Period 



Characteristic Animal* 



First 



Occurrence of 



Mammoth. 



horse, 

 Glyphodonts 



P/iocene 



Deer Sloths. 

 Ape . Man 



Day , Sta 



Came/. 



Ape . Ma 



Elephant. 

 Sabre-tooth 



CaT, Bear. 



M on Hey. 



Cow , Deer. 



Crefaccous 





Mammals 



Birds . 

 RcpTiles 



Marsupials . 

 Salamanders 



Jurrass/c 



RepTiles 



Bird. 

 Crocodile. 

 Froq. 



Triable 



Reptiles . 

 Amphibians, 



Mam ma/s. 

 Turtles. 

 Dinosaurs. 



Reptiles. 

 Amphibians. 



Reptiles 



Devonian 



Fishes. 

 Ostracoderms 



flyriapods 



Jr/urian 



Invertebrates 



fishes. 

 Scorpions 



Invertebrates 



Bryozoans. 

 Echinolds. 

 Ophiurolds 



Cambrian 



Crustaceans. 

 Molluscs. 

 Worms .etc. 



drachiopods. 

 Tnlobites . 



rocks - no 



FIG. 106. From Pearse. 



