54 



SPAEKS FROM A GEOLOGISTS HAMMER. 



Lateral Zones are much less tilted, and seem to have been 

 displaced by the up-thrust of the Middle Zone. All the 

 rocks which we have observed belong to the Middle Zone; 

 but in this zone is a huge central mass of unstratified Al- 

 pine granite, or protogine, constituting the loftiest summits 

 of the chain, Mont Blanc, Monte Rosa, Bernina, Jung- 

 frau, Finsteraarhorn, and others, while the contiguous 

 portions, on either hand, consist of masses of vertically 

 stratified schists, as we have seen in Aiguille de Char- 



G E N E g AjL S T; U C TJJRE^O F T H E AL P S 



MONT BLANC 



c; Feldspatklc Sehisu 

 d.Dolomitie Limestone 

 e. Black Limestone and 



u', c"st?l'inl Schists 



I, \nthracilic Schists 



e. Vcrruc.no r . Gypsu 



StuoUr: Gcoloyie den & 



STRUCTURE OF THE ALPS OF CENTRAL EUROPE. 



moz, Aiguille du Dru and other pinnacles.* By weath- 

 ering, these projecting strata assume the castellated forms 

 so magnificently displayed from the Flegere. The un- 

 stratified protogine, on the contrary, weathers into the 

 class of rounded forms of which Mont Blanc is the type. 

 It is from the loftier " central mass " that the boulders 

 of protogine so a,bundant along the paths of the glaciers 

 have been transported. 



* Studcr, Geo'ogie der flcfut'fiz. 



