376 



NOTES ON GEOLOGICAL RESULTS. 



" than a chlorite, embedded in a matrix generally inert to 

 " polarized light, but in it are scattered small pieces (of rather 

 "fragmental aspect) of a clear mineral like a felspar, also 

 " little grains and granules of a brownish mineral, sometimes 

 " semi-transparent with a few clear slightly yellow granules 

 "and possibly sometimes epidote. I think there is a little 

 " rutile. Comparison of this slice (and specimen) with some 

 "from the Alps leads one to think it was once a diabase 

 " (probably a dyke) which has been greatly crushed and 

 " changed into a sort of green schist." 



During our visit to the Tielles Cave I collected a piece, 

 one of many lying on the foreshore, Avhere it evidently had 

 fallen from the cliff, a compact, granular-looking yellow 

 rock. This specimen presented difficulties, and before ventur- 

 ing to name it I thought it best to have expert opinion on it, 

 which is as follows : — 



No. 4. — Les Tielles. — " Very difficult to be sure about 

 " this. Much stained with limonite and altered, but probably 

 " by the action of water, not pressure, but under the micros- 

 " cope a rather minutely crystalline structure can be traced. 

 " The felspars, now greatly changed and probably replaced to 

 " some extent by secondary products, and the augite are no 

 "longer easily recognised. It is possible that a number of 

 "tiny brown, wavy semi-transparent rods may be connected 

 " with the latter mineral. It looks at first like a hard 

 "mud-stone, but may be really a decomposed compact 

 "diabase." 



Owing to the indefinite opinion expressed I have not yet 

 named the specimen. 



While at work on the schists I was fortunate enough to 

 find in situ the following : — (a) Amphibole-schist. Greenish 

 amphobolite. This occurred at St. Sampson's, and its schis- 

 tose structure was so marked that the workmen thought it to 

 be slate. 



Not far from this position I obtained a specimen of what 

 I suppose to be a mica-schist. I also obtained, in Herm, a 

 specimen of serpentine schist. 



Superficial Deposits. 



Beaches. — The term "raised beaches" which has found 

 a place in every geological report must now give place to 

 the shorter term, for we have, as previously reported, 

 recorded submarine deposits. 



The excursion to Pleinmont, besides its other uses, was 

 taken advantage of to view the position of the lower level 



