SAEK, HEEM, AND JETHOTJ. 



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either place, and in each direction the dip carries it gradually 

 out of sight. 



The description above given of the series serves with sufficient 

 correctness for the whole of the western coast, from Les Autelets 

 to La Coupee, and for the beds on the island of Brecqhou. The 

 cliffs of this iron-bound coast are very difficult of descent; they 

 give a continuous section, but rarely grant a view of it ; however, 

 the outcrops along their upper edge show no more differences than 

 weathering would naturally cause. In the Havre Gosselin (where 

 landings are effected by an iron ladder up a rock, followed by a cliff 

 scaled with the aid of ropes) the banding is not conspicuous, but 

 will be seen on examination. At Port es Saies (where also a rope 

 assists) the beds are banded just as at Port du Moulin, save that 

 the bands are somewhat thicker. The dip, which was "W. at Port 

 du Moulin and almost nothing, is W.S.W. about 20° at Havre 

 Gosselin and Port es Saies, and veers still more towards the south 

 as the Coupee is approached. Just beyond this the beds dip at an 

 angle of 30° due south, and pass below a higher formation, to be here- 

 after described. North of Port du Moulin the dip-directions have 

 some north in them, and the disappearance takes place in the same 

 manner beyond Les Autelets, but in a cleft which appears inacces- 

 sible, so that the succession cannot so well be observed. 



The series as seen on the east coast is essentially the same as on 

 the west. There are the same alternate bands of hornblendic and 

 felsitic materials, only the texture is somewhat more sandy, and 

 the bands not nearly so minute ; the stripes range up to an inch or 

 two of pale and a foot or so of dark. One specimen I have (from 

 Dixcart Bay) is very coarsely crystalline, and somewhat reminds 

 me of some of the coarsest felspathic grits of Charnwood. The beds 

 are best seen in Dixcart Bay, and in the less accessible Bay Derrible 

 (or Terrible), where a natural shaft (the Creux Derrible) gives a clear 

 vertical section of more than 100 feet. One or two more quartzose 

 beds, 2 or 3 feet thick, not unlike some of the Lizard granitoid beds, 

 occur in the bay south of the Eperqueries, and must therefore belong 

 to the summit of the system. At the Lizard there are successively 

 in descending order a series including granitoid beds, a hornblendic 

 series, and a micaceous series. In Sark we find a hornblendic 

 series, with a few more quartzose beds near its summit, and low 

 down (at Port du Moulin) a thick mass containing a good deal of 

 mica. The similarity is curious, but can scarcely be more than a 

 coincidence. 



Bound the Bay Derrible the dip is N.N7W., but in general along 

 the east coast the beds incline westward in directions that radiate 

 from the Creux harbour, the easternmost point of the island. As 

 the highest point of Sark is 375 feet above the sea, these beds halve 

 a thickness of at least 400 feet ; allowing for the dips, 600 seems 

 probable, and there is a possibility of very much more. 



The question of course suggests itself, What is the origin of these 

 beds ? I do not see how this uniform alternation of varying ma- 

 terials, with parallelism nearly perfect, yet occasi onally interrupted, 



