148 MEETINGS. 



7. — Les Pezeries. 



A few pebbles in head were found here, but their position 

 is not such as to absolutely exclude the possibility of their 

 having been introduced by the agency of man. 



ROCKS. 



1. — Houque Nicolle. 



There are two quarries opened in this hougue, but they 

 have not been opened to any depth, and the greater portion of 

 the rock is much disintegrated. The rock is quartz diorite. 

 In the southern or older quarry a very micaceous patch was 

 noticed, which does not form a vein, but seems to be an 

 inclusion surrounded by the ordinary diorite with which it is 

 blended at the edges. In both the quarries there are veins of 

 quartz felspar in which the constituents are often separated in 

 large crystals, with but little mica or hornblende, but asso- 

 ciated with epidote. One of these veins cuts across the 

 micaceous patch above referred to. 



2. — Pont Vaillant, 



In a furze-brake lying south of Pont Vaillant lane, 

 towards the east end, is a small quarry of disintegrated gneiss. 

 This confirms the line of boundary between the gneiss and 

 diorite adopted by the Rev. Hill in his geological map of 

 Guernsey. Of course many small patches of diorite are found 

 to the south of that line which have not been inserted in his 

 map. 



3. — VAncresse Bay, 



Attention has been called to some large flat stones on the 

 west side of the gully where the peat is found. These seem 

 as though they might have been placed in their actual posi- 

 tion by man, and it has been conjectured that they might 

 have formed part of a cromlech. They are of hard diorite 

 and syenite, contrasting with the rather disintegrated and 

 rusted granitic rock in the immediate neighbourhood. It is 

 not, however, necessary to go far to find an outcrop of similar 

 rock. This will be found in the south-western corner of the 

 bay, and large blocks of the same rock are strewn on the 

 granite over the greater part of the bay. 



4. — Le Tertre, Castel. 



To the east of the rock called Le Tertre, almost opposite 

 the entrance to La Trappe, is an outcrop of Cobo granite, 

 but a little way down the same rock an exposure of diorite and 



