PERI ODS 



HIMALAYAS 



SWISS ALPS 

 PYRENEES 



EASTERN ALPS 

 (Partly) 



EOCFNE 



I I 



i?OQOi 



, I - I i I I 



PE,RMIAN, 



I I I . I J j I 

 HE HERCYNIAN BELT OF ^^ ^ 



CENTRAL EUROPE? A ////',/■, , 

 // CARBON I EEROUS- / 



'////^/;;/ 



■/A//y^^:^/. 



^ /////////. ^4(300 / 

 ///DEVONIAN-/ //• 



'''//^///''^ 



/<//////ggO-OQ< 



SCOTTISH HIGHLANDS^ 



SILURIAN 



FINLAND 



E.SCANDINAVIA 



S.BOHEMIA 



15000 



ORDOVICIAN 



17000 



CAMBRIAN 



16000 



ALGONKIAN 



< > 



S6{ 



{ y 



'/CARBON I FEt^Ol/S//. 



y ///////// /y // 



ARCHAEAN 



ROCKY 



MOUNTAIN 



, I , I I ' I ; I rrv (LARAMIE) 



I I i I I I i , I I I . n 



SIERRA NEVADA 



PALISADE 



APPALACHIAN 



ACADIAN 



SILURIAN 



TACONIC 



ORDOVICIAN 



CAMBRIAN 



? PRE-CAMBRIAM 



ALGONKIAN 



? ARCHAEAN 



ARCHAEAN 



Fig. 13. — A diagram showing what the total thickness of the earth's crust would be if all 

 the surface deposits since the time of the first appearance of life had accunuilated on top of 

 each other. Age of Mammals = dots. Age of Reptiles = vertical lini'S. Age of Amphibians 

 and Fishes = oblicjuc lines. The births of American and Eurasiatic mountain systems are 

 indicated f)y incisions of the right and left hand columns respectively. 



