90 



PROCEEDINGS OE THE GEOLOGICAL SOCIETY. [JaU. 10, 



west, which we estimated at from 2000 to 3000 feet in height ; and 

 on our right the great chain of the Atlas, rising 11,000 feet above us 

 and between 12,000 and 13,000 feet above the sea, bounds the 

 southern horizon, framing-in the great plain, here some 50 miles 

 broad, which is lost as a level horizon in the eastern distance. 



Fig, 1.—" CameVs Back," fiat-topped liills in the plain of Morocco. 



The Atlas Range. — Commencing at Cape Guer, on the Atlantic 

 sea-board, the range, which at a little distance has the aspect of a 

 single ridge, averages at its western extremity from 4000 to 5000 

 feet in height, from which it slightly falls off in height eastwards ; 

 it then rises again in the province of Hah a to a maximum height of 

 11,500 feet at a point, Djeb Tezah, 100 miles from the coast, and 

 about S.W. of the city of Morocco. Here a second depression occurs, 

 affording a pass to the south, at an altitude of about 7000 feet ; and 

 immediately east of this, and due south of the city of Morocco, the 

 range for 30 miles in length presents a long unbroken ridge, 12,000 



Pig. 2. — Ridge of the Great Atlas, drie south of Morocco, 12,000 to 

 13,000 feet, as seen from. Sectana, Atlas plateau, 45Q0 feet. 



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Pass ascended May 10th, 1871. 



