20 



CORNISH POST-TERTIARY GEOLOGY. 



The following section was obtained in the cliifs to the south of 

 Perranuthno : 



Head of angular greenstone fragments in loam, in places stained 

 reddish, and with few stones toward the base, upon — fine quartz 

 gravel, or coarse waterworn sand mixed with earthy matter 

 from the Head above, 5 feet thick, and, at base, about 8 feet 

 above high-water mark. 



Kear the above, under Head as before : 



Coarse sand with earthy matter, cemented by iron into nodular 



1ft. 



Coarse sand, cemented in veins by iron 



Coarse sand or fine gi-avel, chiefly composed of quartz ; grit, 

 slate and flint being also present ; containing angular and sub- 

 angular fragments of quartz and greenstone 



3ft. Gin. 

 h-water 



The base of the deposit is from 8 to 10 feet above h 

 mark. 



(Fig. 12.) In St. Loy Cove, south of St. Buryan, to the east of 

 the stream, the clifi" section consists of: 



Angular and subangular blocks of granite and stones of quartz, 



slate and fine slaty grit in brown sandy loam 10ft. to 15ft. 



Yellowish-brown loam, with angular stones and pebbles, of 

 granite, grit, and quartz, presenting an appearance of 



irregular bedding 2ft. 



Coarse angular granitic sand (Growan), with large rounded 

 granite houlders and pebbles of quartz, dark- bluish slate, 

 granite, etc. At base, about 10 feet above high-water mark... 4ft. 



St. Loy Cote. 1 inch = 24 feet. 



Land's End District. 

 In Sennen Cove, Whitesand Bay, here and there at the base of the 

 low cliffs, pebbles are visible under stony loam ; in one place a trace 

 of black, consolidated coarse sand binds two boulders of gi-anite, at 



