MEETINGS. 329 



11. — East Coast, between Bec-du-Ncz and Calais Valley. 



Calcareous concretions in the head similar to those at 

 Jerbourg and Fermain Bay have been noticed. 



12. — Jethou. 

 EAISED BEACHES. 



On the east of the landing is a good specimen consisting 

 of pebbles up to 6 inches in diameter, resting on 2 or 3 feet of 

 sand and overlain by head. In Grand Fauconniere Bay there 

 is a raised beach about 300 feet in length, with large pebbles 

 up to a foot or more in diameter. The extreme thickness is 

 15 feet. 



The above beaches are of no great elevation above 

 present sea level, but on the south-west a patch of raised 

 beach about 50 feet above mean tide occurs over the mouth of 

 a cave. Head is generally found, in some places containing 

 blocks up to 6 feet in diameter. The beach in many places is 

 strewn with similar blocks, doubtless derived from the de- 

 struction of the head by the action of the sea. 



ROCKS. 



1. — Isabel Road. 



The rock exposed is very much decomposed and generally 

 stained with iron peroxide. It appears to be a fine grained 

 syenite, but in the quarry, where it is seen in a better condi- 

 tion, it has a gneissic appearance and contains red felspar and 

 chlorite. Veins of felsite and diorite are also seen in the 

 quarry. 



2. — Gravel Pits near St. George. 



The gravel is chiefly decomposed granite similar to that 

 at Cobo, and, like some parts of said granite mass, it contains 

 many inclusions of gneiss and the associated diorite veins. 

 These veins were intrusive in the gneiss, and have been caught 

 up with the gneiss into the newer granite, although in one or 

 two places one might be misled by appearances. 



3. — Cliffs from Pleinmont to Creux Mahie. 



In these cliffs dykes are numerous. Most of them are of 

 fine grained diorite, but in a gorge eastward of that known as 

 Victor Hugo's is a dyke of somewhat different character, 

 resembling vesicular lava ; the cavities, however, appear to be 

 due to the weathering out of crystals, probably felspar. At 

 the Thielles the dykes are also numerous and dip N.E. at an 

 angle of about 30°, Some of these dykes appear to blend in 



