2ft. 



6in. 





9ft. 



Oin. 







4in. to 5in. 



9ft. 



or 10ft. 



Oin. 



6ft. 



or 7ft. 



Oin. 



6ft. 



or 8ft. 



Oin. 



2ft. to 10ft. 



Oin. 



1ft. 



to 1ft. 



6in. 



W. A. E. Ussher — Post- Tertiary Geology of Cormcall. 105 



miners state to occur facing eastward for some distance to the south- 

 ward, and to be worn into numerous hollows. The sand in this 

 part of the deposit " contained very large pebbles and boulders and 

 angular" stones. 



Compare the section given by De la Beche (op. cit.) with the fol- 

 lowing by Hawkins on the North side of the Beacon (op. cit.), and 

 by Henwood, locality not specified (op. cit.) : 



(7) Yellow Cobb with rubble of Killas stones 



Brown sand with sedimentary divisions dipping S. at 45°... 



White Clay 



Brown and bluish-grey clay (with a slight admixture of 



carbonaceous matter) , 



Gritty sand 



(8) Loose stones and earth, up to .. ... 



Pink, yellowish, and brownish sand, in layers dipping 



southward 



(In the lower portions small ferruginous crusts and masses 

 of conglomerate in a sand or clayey matrix are some- 

 times found in various pits.) 



Stiff blue clay 



Milk-white sand occasionally clayey in the upper part. 



Bed of pebbles in which stream-tin is said occasionally to occur. 



The following section on the North of the Beacon is given by Dr. 

 Boase (Trans. B. Geol. Soc. Corn. vol. iv. p. 296) : 



(9) 1. Subsoil— earth with angular stones 1ft. to 2ft. Oin. 



2. Yellow and white sand, with minute particles of schorl 



3. Dark ochreous-coloured sand, with a minute quantity 



of clay between the grains 2ft. Oin. 



4. Soft and greasy, tough, adhesive blue clay, with an 



oily rancid smell, as if from impregnation of 



animal matter 1ft. Oin. 



5. Clay (called Furnace clay), white and plastic, emitting 



an argillaceous odour 3ft. Oin. 



6. Sand, nearly pure white 7ft. Oin. 



7. Loose rubbly layer, like (1), said to rest on solid rock. 



(10) Quoted by Mr. Henwood (op. cit.) from the Mining Beview, 

 paper by Mr. Thomas : — Section on the North of the Beacon, half a 

 mile from it, near Wheal Kind. Surface 383 feet above high water. 

 Eight feet sunk in white sand (7 feet below the surface). 



(11) Mr. Henwood quotes (op. cit.) the following : — N.W. from 

 the Beacon. Surface at 377 feet above high water. Sand met with 

 at 3 feet below the surface : 15 feet sunk through yellow sand. 



(12) Messrs. Kitto and Davies give the following section to 

 N.W. of the Beacon : 



Soil and Head 4ft. Oin. 



Blue fire clay (coarse, through admixture of sand) 7ft. Oin. 



Candle clay, adhesive and very tough 2ft. Oin. 



Sand resting on Killas , 5ft. Oin. 



(13) Mr. Hawkins (op. cit.) gives the following section on the 

 East of the Beacon : 



Depth of the deposit, 24 feet in all. 



Yellow Cobb under vegetable mould 



Yellow sand 



Mining clay 



Wbite sand 



A few flatfish pebbles in black mud (local name) ... 



2ft. to 3ft. 



Oin. 



3ft. to 4ft. 



Oin. 



1ft. 



2in. 



4ift. to 5ft. 



Oin. 



2ft. to 3ft. 



Oin. 



