Ixxxii PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [May 1 898, 



The Glacial Deposits of the Vale of Clwyd and adjoining 



Areas. 

 Before examining in detail the evidence which has been obtained 

 to show that some of the caverns in the Yale of Clwyd, after 

 occupation, had been buried under the Drift, and that the remains 

 in others had before and during the Glacial period been disturbed 

 by water-action, it may be well to refer more particularly to the 

 deposits which have been classed as of Glacial origin in that area. 

 They have been so fully described in the Memoirs of the Geological 

 Survey by Messrs. Strahan & Tiddeman that it will be unnecessary 

 to do more than refer to the main facts which have been recorded 

 by these authors in regard to them. It is stated^ that no 

 detailed classification applicable to the whole area had been found 

 possible, and that Glacial sands and gravels are probably intercalated 

 at diflferent horizons in the Boulder Clay. It is also mentioned that 

 one of the best sections of the Drift-deposits in the district was 

 provided in the sinking of Walker's shaft at the Talargoch Mine. 

 The shaft is situated 200 yards away from the limit of the Drift, 

 where the limestone rises in the chff of Graig-fawr. The following 



beds were passed through : — 



Feet. Inches. 



/^Soil 1 6 



Marl and Clay 21 



Dry Sand 10 6 



Quick Sand 30 



Glacial Beds -( Strong clay 6 



Gravel 24 



Gravelly clay, with water 30 



Sand and gravel 36 



Gravel, containing bones 12 



171 



Floor of Carboniferous Rocks. 



Dr. Buckland^ also gave a section of the Talargoch Mine, as 



follows : — 



Feet. 



/Vegetable mould 2 



Glacial Beds^ ^^^^ "^^ 



I Sand and gravel, with pebbles of copper- and 



^ lead-ore, and horns, teeth, and bones 204 



284 



^ A. Strahan, 'The Geology of the Coasts adjoining Rhyl, Abergele, & 

 Colwyn,' Mem. Geol. Surv. 1885, p. 28. 

 =^ ' Rehq. Diluv.' London, 1823, p. 178. 



