530 Geological Xotes. By G. A. Lebour, M.A., F.G.S. 



but water and the presence of a number of " stone troubles " and 

 faults have hitherto prevented continuous working. 



Of the many faults affecting the beds thus briefly described, 

 the writer will say nothing, since his knowledge respecting them 

 is still very imperfect. He would, however, call the attention of 

 observers to the very high dips of the sandstone rocks in the 

 Grasslees valley, at the southern base of the Beacon Hill, as being 

 the indication, probably, of a very important line of dislocation, 

 an accurate knowledge of which would in all likelihood, go far 

 to explain the apparently singular relations of the Eothbury and 

 Harbottle Grits, in Upper Coquetdale. 



Of igneous rocks the Elsdon ground contains but one specimen. 

 That, however, a good one. A great whinstone dyke (dolerite), 

 belonging to the North-East and South-West Series of Dykes of 

 this County, and of which the writer has elsewhere written as 

 follows: — "The Zewis Burn or Troughend Byhe is first seen in 

 the County in Short Cl-eugh, a little valley formed by a tributary 

 of the Lewis Burn ; thence good exposures are frequent, as in 

 the railway cutting east of the Belling, crossing the Tarret Burn 

 at High Green, in the field just north of Troughend Hall, in the Els- 

 don Burn between Elsdon mid High Carrick, on the road from Elsdon to 

 Billsmoor ; and lastly (and perhaps best of all), in a deep cleugh in 

 the hills between Billsmoor Park and Darden Lough, whence it has 

 been traced to the south of Tosson, as I am informed, by Mr Topley. 

 This dyke is sometimes very inappropriately called the Falstone 

 Dyke."0)_ 



The italics in the above passage, denote the words specially 

 relating to the Elsdon district. 



(9) See " Outlines," p. 60. 



