1858.] OEMEKOD EAfiTHQUAKE WEAJB. DAKTMOOR. 189 



the vicinity of the junction of the granite and the Carbonaceous 

 rocks. Crediton is the most north-easterlj point at which, as far as 

 I can gain information, the occurrence was noticed. No vibration 

 of the ground was there felt, but a rumbling noise was heard, 

 attributed at the time to a supposed explosion of the Gunpowder 

 Mills on Dartmoor. No such explosion, however, had taken place. 

 Crediton is on the spur of New Eed Sandstone that extends thence 

 in a westerly direction, by Bow and North Tawton, to Exboume ; 

 this last place is situated about four miles to the north of Oke- 

 hampton. No vibration or sound was noticed at either of the three 

 last-named places, or to the south of Crediton, at Exminster, Kenton, 

 Star Cross, or Teignmouth, all on the same geological formation. 

 The Carbonaceous rocks lie to the west, between the New Red 

 Sandstone and the granite of Dartmoor, which they adjoin on the 

 east, north, and west sides. At Chudleigh and Hennock, both on 

 the Carbonaceous rocks, no sound nor vibration was perceived on the 

 28th ; but at Trusham, to the north of Chudleigh, on the same 

 formation, on the eveniug of Thursday the 30th, a noise was heard, 

 which a person who had resided in a country subject to earthquakes 

 immediately recognized as arising from that cause. At Bovey Tracey, 

 partly on the same formation and close to the edge of the granite, 

 no sound nor vibration was perceived. 



At Druids, on the Devonian beds, and near the edge of the gra- 

 nite, about a mile to the north-west of Ashburton, a rumbling noise, 

 like that caused by a carriage passing over gravel, was heard on the 

 28th about 7 p.m. The flexure marked in the Map of the Geological 

 Survey as passing between Ashburton and Druids does not run to 

 the south of the last-mentioned place, which is shown, by the 

 numerous fossils there existing, to be on the Devonian beds. This 

 is one of the flexures mentioned by Sir Henry De la Beche in the 

 * Memoirs of the Geological Survey*,' as giving to the Carbonaceous 

 rocks or Culm-measures of Central Devon the appearance of dipping 

 beneath the argillaceous slates, limestones, and trappean rocks of 

 Ashburton and Buckfastleigh. At Ashburton neither sound nor 

 motion was noticed. 



The earthquake was not, I believe, noticed at any place on the 

 Carbonaceous rocks along the eastern edge of the granite south of 

 Drewsteignton. At Lustleigh, Manaton, the Yitifer Miues, and 

 North Bovey, all on the granite, neither sound nor motion of the 

 earth was perceived. At Moreton Hampstead (on the granite), about 

 a mile and a half to the north-east of North Bovey, no motion was 

 felt, but a sound resembling the roar of a furnace was heard. At a 

 farm, on the granite, about half-way between Moreton Hampstead 

 and Chagford, the farmer heard a sound, and mistook it for the 

 noise of a cart that was expected; he rose from supper, lighted his 

 lantern, and went out to meet it. 



At Chagford, on the granite, both sound and motion were noticed. 



* Vol. i. p. 85. 



p2 



