77 



Monument ; and the late Mr. Hudleston found one on Creech- 

 barrow, 380 feet above O.D. It may be thought that they were 

 carried there by some children. — 32. 



Mr. Reid further suggests that the pipe-clays of the Bagshot 

 series were derived from the weathering of the Dartmoor 

 granite. — 33. 



The latest writer on this subject is Mr. Strahan, in the 

 "Geological Memoir of the Neighbourhood of Weymouth," 

 published in 1898. Speaking of the plateau gravels on Blackdown, 

 by the Hardy Monument, 600-700 feet above O.D., he says they 

 consist chiefly of the remains of the dissolution of flinty chalk, 

 together with an abundance of quartzite, pebbles and sarsens, from 

 the neighbouring tertiary beds. The only satisfactory explanation 

 seems to him to be that the transport was effected during the 

 glacial period when the freezing of the soil and a presumably heavy 

 snowfall would bring into play forces different from those now in 

 operation. The movement seems to have been from N.E. to S. IV. — 34. 



Mr. Reid, in a private letter dated 1900, says that on the whole 

 he agrees with Strahan's view. — 35. 



In 1883, Mr. Irving read a long and important paper on the 

 Bagshot strata of the London Basin and their associated gravels. 

 Speaking of Bournemouth he said that in the coast section exposed 

 on the west of this town there are gravels resting in the Bourne- 

 mouth sands which, in their composition agree precisely with the 

 gravels of the Bagshot district, and upon these are superimposed 

 gravels apparently of glacial origin. In the Bagshot district the 

 limits of such glacial gravel are from 250 feet to 400 feet above 

 O.D., and as a whole they may be classified thus : — 



(1) Gravels of the ancient plateau, stratified more or less distinctly. 



(2) Terrace gravels, quite unstratifed, of glacial origin. 



(3) Lower alluvial gravels of the present river valley. — 36 



In 1894, Mr. Gardner pointed out that at Bournemouth there 

 is a series of beds 300 feet thick, entirely of fresh water origin, 

 partly underlying the marine beds. The whole of the deposits to 

 the west of the pier show an entire absence of the wreck of 

 cretaceous rocks. The Bournemouth area was, in later eocene 

 times, the estuary of a river as large as the Ganges flowing from the 

 south-west through a country of igneous rocks. — 37. 



It is, apparently upon these sands, brought from the south-west by 

 a Ganges that had flowed over igneous rocks, that Mr. Irving's 

 glacial graves rest. 



Near South Moreton, eight miles east of Dorchester, and about 

 60 feet above the present River Frome, is a patch of sand with 

 gravel seams, differing in many respects from the neighbouring 

 Bagshot strata. Overlying the sand is a gravel deposit made up of 



32 — Proc. Dorset Field Club, xxiii., 174. 

 33— QJ.G.S:, hi., 492-4- 

 34- Op. cit., p. 199. 

 35 — Letter to Mr. Jukes Brown. 



36 — P.G.A. , viii., 164-5. 



37 — P.G.A., xiii., 274-6. 



