586 Mr. H. Jeffreys on the Compression 



Table. — The Great Mountain Ranges. 



Range. 



Scandinavian 



Alps 



Carpathians 



Apennines 



Urals 



Caucasus and Armenia . . . 



Iran 



Himalaya , 



Suleiman &c , 



Karakorum and Hindu 1 



Rush J 



Kwen Lun 



TianSban .. 



Altai 



Abyssinia 



Drakensberg 



Atlas 



Coast Range &c 



Rockies , 



Appalachians 



Andes 



Length 

 (km.). 



1400 

 1000 

 1300 



900 

 2200 



3500 

 1400 

 4000 

 1200 



2400 



2300 

 2000 

 1600 



2000 

 1500 



2000 



4000 



7000 



800 



rooo 



Mean 

 Height 

 (metres). 



1000 



3000 



1000 



700 



700 



2000 

 2000 

 5000 

 2000 



1000* 



1000* 

 3000 



2500 



2000 

 1000 

 1500 



2000 

 2000 

 1000 



2000 



Com- 

 pression 

 (km.). 



10 



118 t 

 10 

 10 

 10 



40 



40 



100 



30 



20 



20 

 60 



50 



40 

 20 

 30 



16 1 

 40 1 

 60 1 



40 



Area 

 compressed 

 (thousands 

 of sq. km.). 



14 



118 



13 



9 



22 



140 

 56 



400 

 36 



48 



46 

 120 



80 

 30 

 60 



40 



280 



48 



280 



Total 



1920 



* It is assumed that the folding needed to produce the plateau of Tibet 

 was all at the margins, and is thus included in that found for the Himalayas 

 and Tian Shan. Thus^ for the mountains within the area it is only necessary 

 to consider the height above the general level of the plateau. 



t These data are those that have been obtained directly from the geological 

 evidence. 



It is thus found that in the formation of mountains 

 the surface of the earth has been diminished by crumpling 



