428 rPvOCEEDINGS OF THE GEOLOGICAL SOCIETY, 



cutting, of gravel of a different character from that found in the ad- 

 joining cuttings, which had doubtless been there denuded, points to 

 the existence of a temporary variation in the current. 



The question as to the manner in which these valleys were formed 

 will not be entered upon, save as to the portion of the valley of the 

 Teign between Hunt's Tor and Clifford Bridge. The sides of the 

 valley of the Teign and its tributaries above Hunt's Tor are for the 

 most part studded thickly with the remains of beds of gravel of dif- 

 ferent ages, and with boulders which reach up to the summits of many 

 of the hills; and this is the case on the westerly side of Hunt's Tor, and 

 along the line of hills extending thence to the south by Whiddon 

 Park. Granite boulders extend for about three miles along the 

 high ground at the summit of the hills, to the right of the Teign, 

 below Whiddon Park, overlying both the granite and Carboniferous 

 rocks ; they occur also on the hill-side, on the right of the valley 

 only, for a short distance below Whiddon Park. On the left 

 side no granite boulders occur ; and no granitic or other gravel has 

 been noticed on either side of the river between Whiddon Park and 

 Hunt's Tor and the crook of the Teign near Clifford Bridge. At 

 the last-named place gravels composed almost entirely of Carbonife- 

 rous rock occur ; and the gravels between that point and Chudleigh 

 Bridge differ entirely from those above Hunt's Tor. Had the nar- 

 row valley of the Teign that now exists between Hunt's Tor and 

 Clifford Bridge been open at the time when the gi^avels and boulders 

 were deposited against the western side of that Tor, the current that 

 transported them would doubtless have caused a continuation of the 

 deposit for at least a short distance down the valley over the Carbo- 

 niferous rocks, in a manner similar to that which has taken place 

 near Bovey Tracey; but here, although there are many nooks where 

 the gravel would probably have been preserved, there are not any 

 traces of such a deposit having taken place ; it is therefore suggested 

 that the gorge between Hunt's Tor and Clifford Bridge was not then 

 open, and that a disruption of the Carboniferous rocks has taken 

 place since the gravels were deposited. A fault of 100 feet, men- 

 tioned by Mr. Pengelly as existing in the Lower Miocene beds at 

 Bovey Tracey*, shows that down to a comparatively recent geological 

 period disruptions have taken place in a neighbouring part of Devon. 



The last point for consideration is the direction in which the stream 

 or current would have passed from the hollow lying to the west of 

 Hunt's Tor, if an opening had not existed between that Tor and Clifford 

 Bridge. There probably has not been much alteration in the rela- 

 tive elevations of the different ranges of high ground that now form 

 the boundaries of the valleys of the Teign and Bovey. The lowest 

 hollow on the high ground that forms the southern boundary of 

 the watershed of the Teign, between Dartmoor and the west end 

 of the low ridge which divides that stream and Bovey Brook, near 

 Moreton Hampstead, is at Bughead (815 feet above the sea-level); 

 the lowest on the high ground that forms a similar boundary on the 

 north and east to the easterly end of the same low ridge (not 

 ^"- Phil. Trans. 1862, p. 1082. 



