NOTES ON THE GEOLOGICAL RESULTS OF 

 THE SUMMER EXCURSIONS. 



READ BY MR. A. COLLENETTE, F.C.S. 



These notes will refer to the following subjects : (a) Caves ; (b) Rocks ; 

 (c) Superficial Deposits. 



Caves. 



I may remind you that it was determined to use the summer 

 excursions of the year, to search for caves which might offer 

 some chance of being worked successfully for indications 

 of Prehistoric Man. The subject was chosen owing to the 

 success which had been met with in Jersey. 



In our Transactions for 1893 (folio 254) there is a note 

 of the primary excavation of the Goats' Cave in Jersey, 

 by Mr. J. Sinel, but the work of a thorough examination 

 was not undertaken until 1909. 1 find at the foot of that 

 note these Avords written by our then secretary, Mr. W. 

 Sharp : " Possibly some of the caves in Guernsey would 

 repay an examination of this kind." 



I do not think that our Society has altogether neglected 

 the subject, but our Transactions prove that although we have 

 visited the most promising caves we certainly have made no 

 organised effort to bring their hidden treasures to light. 



The work of this year may be said to be preparatory, 

 that is, we have viewed caves with the object of discovering 

 where we could work effectively. 



Our labour has been confined to the following districts 

 and caves. 



1. — The Cave at Les Tielles has been visited twice 

 with the result that it was considered to offer only slight 

 chances of success. This cave has been described in the 

 Transactions each time it has been visited. On page 13* in 

 the volume for 1895, the following dimensions are given on the 

 authority of Mr. J. J. Carey : length, 60 feet ; height, 

 18 feet, and 20 feet wide, at the entrance, tapering down 

 to 6 feet high and 4 feet wide, with its floor well above high 

 water mark. 



The cave is due to the disappearance of an intrusive 

 dyke by weathering. The original length was probably twice 

 * See also Yol. 1896, folio 88. 



[1911.] 



