22 CORNISH POST-TERTIAR"t GEOLOGY. 



The following section was obtained from the cliffs, near Cape 

 Cornwall. 



Brown loam, with numerous angular fragments 



Impersistent band of blackish loam 



Dark-bro^\Ti loam, with fewer angular stones than the upper bed 



Brownish-yellow sandy loam, with a few angular fragments ... 



Brownish sandy loam, with angular fragments, and pebbles of 



quartz, slate, and greenstone, and boulders near its base which 



is in places on the level of the present beach 4ft. Oin. 



Head is shown on a rock isolated from the cliffs, near Cape 

 Cornwall. Mr. Came ^ describes a Eaised Beach in Treen Cove, to 

 the east of Gurnard's Head Promontory, near St. Ives, composed of 

 pebbles and boulders of the subjacent rock of various sizes, in clayey 

 and sandy matrixes ; about 60 yards in length, 15 feet in thickness, 

 20 feet above spring-tide high- water ; and overlain by Head, earthy 

 clay with angular fragments. 



(Fig. 14.) St. Ives. Cliff sections in Porthgwidden Cove, under 

 Head, of light brown and yellowish brown loam, from 5 to 15 feet 

 thick, shown in the north part of the cove. 



Yellowish-brown loam 3ft. 



Pebbles of grit, quartz, slate, and, occasionally, flint 3ft. to 6ft. 



Fig. 14. Porthgwidden Cove, St. Ives. 

 1 inch = 24 feet. 



In another part of the Cove : 



Quartz, slate, grit, greenstone, and, occasionally, flint pebbles in 



yellowish-brown sand 4ft. Oin. 



Strip of rather fine yellowish sand 4iu. to 6in. 



Quartz, grit, slate, and occasional flint and granite pebbles in 



yellowish-brown sand 3ft. to 4ft. 



The base of the pebble deposits is about 5 feet above high-water 



mark. 



1 T. 11. G. S. Corn. vol. vii. p. 176. 



