42 CORNISH POST-TERTIARY GEOLOGY. 



The section at Treen Cove, given by Mr. Carne, if an instance of 

 Eaised Beach, is of very exceptional height (20 feet above spring- 

 tide high- water), and it is not clear whether he regarded the whole 

 mass, 15 feet thick under the Head, as Eaised Beach, or only the 

 lower part of it. 



The paucity of shells in the Eaised Beaches, and their very local 

 occurrence, is worthy of note.' 



OLD BLOWN SANDS. 



It is not easy to fix a definite junction between Old Blown Sands 

 and Eaised Beaches, where both are similarly bedded and consoli- 

 dated. In the lower parts of the Old Blown Sands of Fistral Bay 

 and Godrevy Beach pebbles are sparsely disseminated, sometimes 

 in impersistent lines, having been probably cast up by storm waves. 

 In the clifi"s of Godrevy, Fistral Bay, Towan Head, New Quay, 

 Green way (N. of Padstow), the best examples of Old Blown Sands 

 ai-e shovsm, attaining in places to 20 feet in thickness. 



In Greenway Clifi", and in parts of Fistral Bay, the Old Blown 

 Sand projects from the cliif face in hard corrugated laminae of 

 siliceous sandstone. 



In parts of Godrev}^ Cliff, and near New Quay Pier, the Old 

 Blown Sand is consolidated in hard thick beds. 



HEAD. 



Though from its general appearance the Head might be regarded 

 merely as an old talus, shed from the adjacent heights upon the 

 raised platform of the old beaches, in some cases fragments have 

 been incorporated which could not have been derived by mere 

 weathering, but were probably carried down by torrential surface 

 waters or melting snows from higher lands not far off", but not in the 

 immediate vicinity. "Where the Head, for instance, cajDS cliffs form- 

 ing the seaward termination of a valley, one might expect to find 

 fragments in it which had travelled some distance. The appearance 

 of stratification sometimes exhibited might be satisfactorily exj^lained 

 by seasonal changes. Thus the disintegration and slip of numerous 



' 'When the fra^entary condition^of the Raised Beaches is taken into account, 

 as well as, in many cases, the unfavourable nature of their materials for the pre- 

 Bervatiun of shulls, uxcept in a microscopically coumuiiuted state, objections to 

 unfossiliferous deposits being regarded as Kaised Beaches will be shown to be 

 unfounded.— W. U., Sept. 1879. 



