W. A. E. Ussher — Post-Tertiary Geology of Cornwall, 207 



12 feet thick, containing whole shells and slate fragments cemented in 

 sand, resting on slates, and supporting immense heaps of drifted sand. 



i. De la Beche (Report, p. 427) describes the Fistral raised beach as 

 rolled pebbles, often large, mixed with smaller gravel and sand, 

 overlain by alternations of fine gravel and sand (the layers being 

 unequally consolidated), capped by sand, becoming mingled with 

 rock fragments, near the extremity of the dunes on the north and 

 south. 



j. Mr. Pattison (T. E. G. S. Corn. vol. vii. p. 50) mentions the inter- 

 section of the Fistral raised beach by a lead lode, in the middle of 

 the Bay. He describes the present beach as " fine sand and an 

 abundance of shells ; it exhibits no pebbles save those derived from 

 the ancient beach." 



18. New Quay. 



a. On the east side of Towan Head, a trace of black consolidated 

 sand with pebbles is visible at about 6 feet above high water. 



b. On the west of New Quay Pier, the section consists of coarse 

 yellowish-brown consolidated sand, chiefly made up of comminuted 

 shells, with a few shells of Helix, containing angular, subangular, 

 and rounded stones and boulders of quartz and slate (a granitoid 

 fragment was found) at the base ; upon coarser sand with well- 

 rounded fragments resting on a narrow rocky platform 6 feet above 

 high- water mark. 



c. Dr. Boase (T. R. Gr. S. Corn. vol. iv. p. 259) noticed a bed of 

 shelly sandstone, on the north of New Quay signal station, contain- 

 ing fewer shells than at Fistral Bay ; the lower part, just above high- 

 water mark, being consolidated into a conglomerate. 



d. De la Beche (Report, p. 427) gives a section on the east of 

 Look-Out Hill, New Quay, of an ancient beach of rounded slate 

 pebbles agglutinated by consolidated sand, some feet above the sea- 

 level ; capped by layers of sand of comminuted sea-shells con- 

 solidated in the lower parts ; under a Head of angular fragments 

 from the rocks of the hill above. 



19. Between New Quay and Padstow. 



a. A thin capping of Head visible on part of Trevelga Head Island. 



b. To the west of Tregurrian, Head of angular and subangular 

 slate and quartz stones is shown in the cliffs, under greyish sandy soil. 



c. West of Trenance (N. of Mawgan Porth) the Head consists of 

 brown loamy clay with large quartz boulders, and small slate and 

 grit stones. 



d. At the north end of Treyarnon Bay the low cliffs are capped 

 by 6 inches of angular quartz and slate stones, under brown clay, 

 one foot thick. 



e. The cliffs bounding Constantine Bay, for about three-quarters 

 of a mile, seldom exceed 7 feet in height. Opposite Constantine 

 Island the cliff is composed of — 



Blown sand with a layer of broken Mytili, and whole Patellce, 

 finer in the lower part, and containing angular pieces of 

 slate, and fragments of shells, as above 4 ft. 6in. 



upon — coarse quartzose sand with rounded grains 1ft. to 2ft. 



resting: on slates at 6 feet above high water. 



