430 PEOCEEDIXGS OF THE GEOLOGICAL SOCIETY. [April 22, 



under the higher limestone of Longcombe, which, associated with 

 some volcanic ash, ranges by Great Court and Howell towards the 

 limestone of Boston. Other faults exist, some of which have been 

 laid down on the map. 



This faulting, or rather the force which produced it, has so con- 

 torted and fractured and, as already stated, so dislocated the lime- 

 stones, that it is very difficult to distinguish in this neighbourhood 

 the slates which were anterior from those which were posterior to 

 the period of the limestone*. 



The dip of the Dartington limestone, fi^om the south of Staverton 

 round by Skinners Bridge to Vineyard, is inward towards Dartington 

 House as a centre. In the quarries at the two last-named localities 

 the bedding is more than usually clear. South of Dartington, how- 

 ever, the outer edge of the limestone is thrown over and dips to the 

 south-east. The two limestone masses on the opposite side of the 

 Dart, the one west of Buckyatt, the other west of Little Hempston, 

 are the continuations of the Dartington limestone faulted off. The 

 former rests on volcanic rock, which has not altered it, and is over- 

 lain by slates with some ash bands dipping to the south-east. 

 These rocks, therefore, are above the limestone, and presumably 

 those also of Dartington House, as the limestone dips towards them. 

 The other mass of limestone, west of Little Hempston, is traversed 

 by a fault along its line of strike, which is continued on to the railway- 

 cutting below Forder Bridge. This fault has brought some volcanic 

 rock against the limestone on the west, while the slates on the east 

 of the hmestone dip off it towards Little Hempston. South-east of 

 the village there is another faulted strip of limestone, the northern 

 portion of which dips to the south-east at a high angle, while the 

 southern half in the quarry and railway- section dips north-west to- 

 wards the church. It appears, therefore, that all the slaty rocks 

 between the Buckyatt limestone and that of Bunker's Hill and Gate- 

 combe House are above the limestones ; but it is not clear how they 

 end to the north-east ; there are, however, some appearances of a 

 fault running north-west and south-east by Forder Bridge ; and the 

 dip of the Fishacre limestone, which appears to be the continuation 

 of that west of Buckyatt, is reversed. 



The mass of limestone extending from Boston, by Bunker's Hill, 

 to Gatecombe House, appears to be thrown up by a fault ; but there 

 is great uncertainty respecting the relations of the slates on the 

 west between Bunker's Hill and Beriy Pomeroy, the dip of the 

 lamination in the slate being often quite at variance with the bed- 

 ding of the limestone. The same want of accordance between the 

 bedding of the limestone and the lamination of the slates is again 

 observed at Arton. 



The lower slates and limestones are again brought up to the sui-- 



* Sir Henry De la Beche appears to hare considered that these limestones 

 may have had "their geological continuation consisting in slate." It is difficult, 

 however, to fall into this view, seeing that the limestones are for the most part 

 devoid of detrital materials, and would appear therefore to have been formed in 

 waters free from muddy sediments. Vide Eep. p. 72. 



