54 



PLEISTOCENE DEPOSITS NEAR rADSTO"VV, 



mark. Mr. Henwood ' mentioned the occurrence of a layer of angular 

 stones mixed with, a few quartzose pebbles on the south side of 

 Trebetherick Point, at about 10 to 12 feet above the present beach. 



The same observer noticed the agglutination of sand forming 

 patches of recent sandstone, which has been used in parts of St. 

 Euodock's Chapel, on the north-west of Brea Hill.- 



The chief interest in the locality attaches to that part of the 

 Dimbar, or Doombar, sands which is left dry between mean tide 

 level and the sand bank in the centre of the little bay called by 

 Mr. Henwood " Daymer Ba3\" A small stream trickles through 

 the sand bank near the southern side of the bay. At from 70 to 80 

 j-ards from the sand bank, and at about six feet below high-water 

 mark, a crust of yellowish, or buff-coloured, laminated consolidated 

 sand, made up chiefly of comminuted shells, and containing sub- 

 angular fragments of quartz and slate, often of large size, firmly 

 imbedded in it, together with shells of Mytilus, Littorina, etc., etc., 

 projects in ragged reefs through the modern sand-beach which is 

 strewn with fragments of slate and quartz, probably redistributed 

 relics of the older beach. 



In one spot a large quartz boulder (Fig. 1), with its lower part 

 firmly cemented in the laminated sandstone, occupies a basin-shaped 

 depression in the reef, the laminae having a quaquaversal dip toward 



Fig. 1. DcNBAR Sand?. 



Keef of Old Consolidated Beach with Quartz Bouider projecting through the present Sands, 



al-o a Bed of Feat [i>.) 



About ^ of the natural size. 

 Fortieth Ann. Pup. R. lustit Corn, for 1858. 



Op. cit. 



