1858.] OEMEEOD GEANITE-VEINS. 191 



Okehampton, on the Tavistock road, on the Carbonaceous rocks 

 near the edge of the granite, similar sensations were noticed. At 

 " The Dartmoor Inn," on the same road, about a mile to the south 

 of " The Fox and Hounds," no motion of the ground was perceived, 

 and the inhabitants attributed a noise heard on the evening of the 

 28th to distant firing at Plymouth. 



Beyond Okehampton and " The Fox and Hounds," I have not been 

 able to trace this earthquake to the west. At Exbourne, four miles 

 to the north of Okehampton, as before mentioned, the earthquake 

 was not felt. 



The sound mentioned as being noticed at Druids at seven o'clock 

 on the evening of the 28th may probably be attributed to a distinct 

 shock at an earlier hour on the same evening, as no sound nor motion 

 was noticed in the country intervening between that place and 

 Moreton Hampstead. 



With this exception, the shock seems to have been confined to a 

 very narrow district, that may be estimated as not exceeding eight 

 miles in width, and running, as a general direction, at the northerly 

 edge of Dartmoor, along the line of junction of the granite and the 

 altered Carbonaceous rocks. Considering Crediton the most easterly, 

 and *' The Fox and Hounds " the most westerly point, the length of 

 the area affected by the earthquake is about twenty- one miles from 

 east to west. The shock seems to have taken a direction from east 

 to west, to have taken place about eight o'clock in the evening, and 

 to have lasted, where most severe, about fifteen seconds. 



3. On some Yeins of Granite in the Caebonaceous Rocks on the 



NoETH and East of Daetmooe. 



By G. Waeeing Oemeeod, Esq., M.A., F.G.S. 



[Abstract.] 



The author referred, in the first place, to the * Eeport on the Geo- 

 logy of Cornwall, Devon, and West Somerset,' where Sir H. De la 

 Beche writes (p. 184), " On the north of Dartmoor we find two 

 elvans in the Carbonaceous series, one on the west of Arscot near 

 South Zeal, and the other running through Lidbridge and Lidleigh 

 Ball, on the south-west of Hatherleigh. Dykes of this kind have 

 not hitherto been detected to the east of Dartmoor." He then men- 

 tioned the following localities on the north and east of Dartmoor, 

 where the Carbonaceous rocks are intersected by granite- or elvan- 

 dykes. Near Meldon (marked in the Ordnance Map as " Elmdon"), 

 to the south-west of Okehampton, granite-veins penetrate the Carbo- 

 naceous rocks near the spot where the white granite was worked. 

 On Cocktree Moor, to the south of North Tawton, he was informed 

 that a granite-vein had been found. The Carbonaceous rocks on 

 both sides of the narrow gorge through which the river Teign 

 passes, after leaving the granite near Chagford, are intersected in 

 many places by these veins. 



