126 MEETINGS. 



No. 13. — Le Crocq and Richmond. 



The beaches at these places are most important, and 

 demand a careful survey, as they are suffering rapid loss from 

 the erosive action of the sea, One section is particularly 

 interesting, being evidently the land edge of a deposit of large 

 rolled stones which has formed part of an ancient storm 

 beach. These districts abound with interesting patches, 

 which, unfortunately, have not been levelled or measured yet 

 (see photographs Nos. 18, 19 and 20). 



No. 14. — Divette Bay, near Jerbourg. 



A strip of beach stones of small size lies on a bed of 

 rock, and is covered by a cliff which is fully described later 

 on (see photographs Nos. 21 and 22, plan and section). 

 The Society has already observed ancient beaches at Lihou, 

 and has now to connect them with Richmond in order to 

 obain a fairly continuous line of ancient beach from that 

 islet around the Yale to Spur Point and Barker's Quarry. 

 Many patches distinct from these described are known to 

 individual members, and stand to be viewed by the Society 

 as soon as time will permit. 



MICA TRAP. 



The attention of the Society has lately been drawn to 

 the subject of mica trap dykes and their importance by 

 a paper supplied by the Rev. E. Hill, F.G.S., and the following 

 examples of these interesting intrusions have so far been 

 noticed. 



No. 1. — Fort La Crocq and Richmond. 



A good out-crop of this trap is visible just below the 

 small fort, running down the rocks in a north-east direction. 

 It is about two feet wide and is not cut, during its visible 

 portion, by any vein (see photograph No. 19). On the 

 south-west of Richmond a similar dyke was found ; it has the 

 appearance of being a continuation of the same, but this 

 requires confirmation. 



No. 2. — Hommet. 



A similar dyke to the last described has been observed 

 on the east side of this fort. 



No. 3. — Grandes Rocques. 



This dyke is one foot wide. Its bearing is 10° south of 

 east. It weathers green first, then red. 



