318 PEOP. J. PEESTWICH ON THE KAISED 



(14) Devon. — Godwin- Austen has stated that a drift of this 

 character occurs on the hill-slopes and high ground at a number of 

 places in Devon, including amongst others the sides of Exmoor, but 

 without giving particulars. De la Beche, as before mentioned, gave 

 several instances in the Western Counties of the occurrence of gravel 

 in positions where " we can scarcely explain its transport from the ad- 

 joining high lands by means of river drainages, such as we now see."^ 



Mr. H. B. Woodward has noticed the great extent and variable 

 character of the drift-beds in the valleys in soine parts of South 

 Devon, and a section which he gives shows how far they extend up 

 the slopes of the hills ^ ; and Mr. Ussher has described a number of 

 anomalous beds of gravel in various parts of Devonshire discon- 

 nected with the present lines of drainage.^ 



Round the flanks of Dartmoor there are local drifts which should 

 probably be referred to this rubble. Mr. Maw ^ mentions one such 

 at Petroclistow, where there is an isolated bed of gravel composed 

 almost entirely of the detritus of Dartmoor granite, and distant 

 12 miles from the nearest granite in place. " From its situation, it 

 is impossible that it can be a mere alluvial deposit brought down 

 from Dartmoor by [along] any existing or ancient river-valley." 



Mr. Ormerod ^ has also noticed some gravels and boulders at. 

 various heights on the flanks of Dartmoor, for which he cannot 

 account by glacial action. These may belong to the Bubble-drift. 

 Trunks of trees were found, in one instance, in what he called the 

 ' Contour gravel,' consisting of an angular rubble covering tlie 

 slopes of the hill. Mr. Belt^ has also described great patches of 

 angular gravel and blocks at heights of from 900 to 1200 feet on 

 the flanks of Dartmoor, as well as in the valleys of Devon and else- 

 where in the South of England, for which he could not account by 

 any of the ordinary causes assigned for the formation of gravel-beds. 

 Both he and Mr. Ormerod seem, however, to have included in one 

 category drifts of difl'erent ages, but that certain of them belong to 

 the Bubble- drift I have little doubt, though I am not sufficiently 

 well acquainted with the district to specify particular cases. 



There is a small section near the top of Kitson HiU, between 



Pig. 17. — Section of a road-cutting, near Hfracombe. 



Devonian Bocks with quartz veins. 

 [Height = about 400 feet above sea-level.] 

 a. Eubble-drift, 3 feet 



^ 'Eeport on the Geology of Cornwall, &c.' p. 409 et seq. 



2 Quart. Journ. Geol. Soc. vol. xxxii. (1876) p. 230. 



3 Ibid. vol. xxxiv. (1878) p. 449. 

 * Ibid. vol. XX. (1864) p. 451. 



5 Ibid. vol. xxiii. (1867) p. 418. 

 « Ibid. vol. xxxii. (1876) p. 80. 



