THE AGE OF REPTILES 





[WESOZOIC] 



GEOLOGICAL FORMATION -' '■ s v 



THE AGE OF REPTILES 



PRECEDED THE AGE DURING 



THIS AGE THE REPTILES APPEARED. 



Of MAMMALS. AND IS REPRESENTED IN FLOURISHED GREATLY. AND DECLINED AT 



VARIOUS PARTS OF THE 



WORLD BY MARINE. ITS CLOSE TO THEIR PRESENT IMPORTANCE 



ESTUARV AND FRESHWATER DEPOSITS 1 THE MAMMALS APPEARED WELL DOWN IN 



OIVIDED INTO THREE GREAT PERIODS, ' THIS AGE BUT REMAINED SMALL AND 





TRIASSIC, JURASSIC 



AND CRETACEOUS. | SCARCE UNTIL ITS END. 







PERIODS 



FORMATIONS 



mm 



I HARACTERISTH \M\I\I s 





«j| EOCENE 



' TORRE.) ON 





MAMMALS IN LARGE NUMBERS 









TRUE LIZAROSana SPHENOOONS 







PUERCO " 



600 



ALLIGATORS z-c CROCODILES 



TURTLES 



NUMEROUS BONV FISHES TELCOSTSj 













CARNIVOROUS DINOSAURS 

 HERBIVOROUS DINOSAURS 







[_ a <-? A M i E 



'0D0 



^000 



HORNED HERBIVOROUS DINOSAURS 











LAST PLESIOSAURS 













FIRST SOFT SHELLED TURTLES 













MODERN TAILED AMPHIBIANS SA11UANOCRS 













BIRDS. PROBABLY TOOTHED 

 PTEROOACTYLS TOOTHLESS 







MONTANA ' 



200 

 B700 



MOSASAURS and PLESIOSAURS 

 GIGANTIC MARINE TURTLES 











DOLICHOSAURIAN LIZARDS 











SHARKS CAT-FBI STURCF - 







•4 il 







TOOTHED BIROS TOOTHLESS PTERODACTYLS 











DINOSAURS 







s 



COLORAD O 



1000 



MOSASAURS and PLESIOSAURS 







■v. 





3000 



LARGE MARINE TURTLES 







L, CRETACEOUS 







BONY FISHES TELEOSTS SHARKS 

 GANOID FISHES 







<l 



DAKOTA 



400 



FIRST SNAKES 







"u 





5000 



TURTLES 











TRUE LIZAROSanlDOUCHOSAURS 







,. s 







HERBIVOROUS DINOSAURS iguanooont* 







<t <-' 







CARNIVOROUS DINOSAURS MCCAL05.UM 









300 

 2F0O 



PTEROOACTYLS. TOOTHED ArtTOOTHlESS 







- 



COMANCHE 



MOSASAURS 







"s 







ICHTHYOSAURSa-vl PLESIOSAURS 







s. 



WEALD E N 





CROCODILES. TURTLES. 







*s 



POTOMAC 





SHARKS and GANOID FISHES 







u 







CHIM/EROID FISHES 





X 







primitive MAMMALS MARSUPIALS INStCTlMWiS 





< 







in: MULTITUBERCULATESi 







*) 







CARNIVOROUS DINOSAURS CF.RAT0SAURUS 











HERBIVOROUS OINDSAURS ATIANTOSAURUS 











TURTLES PTERODACTYLS 







JURASSIC | 



5 





ISO0 

 4CC0 



ICHTHY0SAURS TOOTHED andTOOTHLESS: 









PLESIOSAURS PTER0OACTY15 TOOTHED" 







s 







SMALL PRIMITIVE MAMMALS 





>■ •• ■:-."■ ; ■:.•,-;, 





§ 







ICHTHY0SAURS and PLESIOSAURS 







M 







FIRST HERBIVOROUS DINOSAURS 











TURTLES. PTERODACTYLS 











SHARKS ana OCWOROSTLAt* FISHES 





CI | 







REPTILE-MAMMALS DOOM ATH.ERIUM. 

 TKITYLOOON. MICROLESTES 





RICHMOND COALE 



FIRST CARNIVOROUS DINOSAURS 





and CONN.and NEW JERSEY 





LAST LABYRINTH00ONTS 







i 







PRIMITIVE CROCODILESBLL0DON 







y TRIASSIC y 







FIRST TURTLES ind PTERODACTYLS 









3000 



FIRST TCLEOST ON BONY FISHES 









SHARKS. CHONDROSTCAN ah LUNG FISHES 









EOOO 



PLESIOSAURS NOTHOSAURS 







5 







first ichthyosaurs[mixosaurus; 







5 







PLACOOOMTS 







% 







LARGE AMPHIBIANS LABY 



I 





5 







RINTHODONTS 







5 







FIRST PLESIOSAURS NOTHOSAURS; 





is 







FIRST REPTILES C0TYL0SAURS. 









PROGArOSAURSan-PELVCOSAURS 







§3 PERMIAN 



■■!■■ 



BOO 

 I0OC 



PRIMITIVE AMPHIBIANS STEB0CEPHAUA 



SHARKS. LUNG FISHES. 

 CHOKDROSTEAN J* CROSSE 







. t> 













-^4 § CARBOHIPEROUS 







PRIMITIVE AMPHIBIANS STECO 



CEPHAUA MOSTLY SAlAu. SPICES 



PR1MITIYE SHARKS it) LUNG FISHES 



' C*DSSOort»v«uJi fishes 



" ! 



i 









DIVISIONS OF THE AGE OF REPTILES 

 Characteristic fossil reptiles, amphibians and fishes, and the formations in which they are found 



3 



