422 KAISED BEACHES. 



granite ; — these, with water-worn and angular pieces of chalk- 

 flints, are found both in the gravel beds and deep down in the 

 fissures of the limestone. Thus we are forced to the conclusion 

 that the beds of gravel and clay on the Hoe have been formed 

 by the action of an overwhelming flood from the north. 



But from whence came the chalk flints, which are found both 

 in the diluvial gravel and in the loam which fills the fissures of 

 the limestone to a depth of at least sixty feet ? The old surmise 

 that they were brought to our shores as ballast, cannot be 

 admitted here. Similar pebbles and flakes of flint have lately 

 been found by Mr. Francis Brent, F.S.A., on Staddon heights, 

 on Maker-hills, in the neighbourhood of Plymouth ; and on 

 many of the highest tors of Dartmoor ; and their wide distribu- 

 tion over the northern parts of Devon and Cornwall has lately 

 been established. Nor can we stop here, the trail of these 

 fractured flints can now be traced northward along the Welsh 

 coast, over the Isle of Man,* up to the Mull of Galloway in 

 Scotland,! and also up the eastern coast of Ireland, from Bally- 

 tottin Bay near Cork, to their native home and birth-place in 

 Down and Antrim. | 



On the map of Europe§ showing the extent of the glaciated 

 areas at the climax of the Ice age, the northern shores of 

 DevoQ and Cornwall are included within the glaciated area : — 

 and the course of the glacial drift marked on the map, is shown 

 to have been southward down the Irish Sea, full on the northern 

 coast-line of Devon and Cornwall. 



* Gumming "Guide to the Isle of Man," p. 165. Also, " Transactions of 

 Edinburgh Geol. Soc," Vol. 2, pp. 342, 343. 



t " Roy. Physical Soc. of Edinburgh," Vol. V, p. 322. 



t " Frost and Fire," Vol. 2, p. 61. 



§ " Prehistoric Europe," by James Geikie, P.E.S., 18S1. 



