330 Mr. N. Wood on the Geology of Northumberland, ^c. 



extent of country, reaching from Talkin to the Grauwacke Hills of 

 Eskdale, dipping under the Coal and upper Limestone beds at the for- 

 mer place, and reposing against the transition hills of the latter. Pro- 

 ceeding eastward, we find the upper beds of Limestone, Plate, and 

 Hazels or Sandstone, below the Basalt, dipping on the south-east edge 

 underneath that rock, as previously traced, and the lower beds of the 

 series bounded by and reposing against the transition hills of Carter 

 Fell, Cheviot, &c. 



Section No. 3, Plate XX VH., will shew the position of the beds along 

 the course of the North Tyne, to the Lewis Burn. I have not had an 

 opportunity of correctly ascertaining the junction of the lower beds with 

 the transition hills, and therefore have deferred, for the present, the con- 

 tinuation of that Section. The northern limit of the Mountain Lime- 

 stone may, however, be traced eastward along the base of the Scotch and 

 Cheviot Hills into the vale of the Tweed. The south-eastern edge of 

 the beds dips underneath the Basalt along the whole extent of the range 

 of that rock from Talkin to the sea at Dunstanburgh ; when probably 

 the protusion of the Cheviot Hills to the eastward throws the range of 

 the edge of the Basalt and underlying beds a considerable distance into 

 the sea, from whence they again recede, by a change in the dip of the ' 

 strata, along the line of the Fern Islands and Bamborough. 



The Basalt then trends westward, and we have the lower beds of 

 Limestone, which are exposed along the line of the coast from Bead- 

 nel to Bamburgh, dipping underneath the Basaltic Hills along the ridge 

 west and north from Belford, until the north rise of the strata throws 

 the basset of the Basalt again eastward into the sea, and exposes the 

 lower beds of the Limestone upon the coast near Scremerston. 



The whole extent of the county eastward from the plain of New Red 

 Sandstone of Carlisle, bounded on the south and east by the line of 

 Basalt, and on the north by Scotland and the Cheviot Hills, to and be- 

 yond the vale of the Tweed, exhibits, therefore, the lower beds of the 

 Mountain Limestone, dipping, with considerable undulations, south and 

 east underneath the upper members of that series. Throughout this 

 district these beds form in some places hills of considerable magnitude. 



