332 Mr. N. Wood on the Geology of Northumberland, S(c. 



generally where the strata are flat. Following the western edge of the 

 Mountain Limestone, adjoining the Carlisle New Red Sandstone, when 

 we reach the Esk and Liddle rivulets, we get near the bottom of the 

 series, and there meet with thick beds of reddish brown Sandstone, with 

 accompanying thin beds of Limestone, and two or three workable seams 

 of Coal, which appear to correspond with the Red Sandstone beds of the 

 Tweed, and which are overlaid by the central Limestone. Further east on 

 the banks of the Lewis Burn, near the head of the North Tyne, we find 

 two or three workable seams of Coal in a nearly similar position in the 

 series, having the great beds of Limestone lying above the Coal. To the 

 east of this, for a considerable distance, little Coal of any consequence 

 has as yet been discovered (though this does not prove its non-exist- 

 ence) ; but, probably, the protrusion of the Grauwacke hills of the Che- 

 viot, within the range of the lower beds of Limestone, by producing such 

 a dislocation of the sti'ata, may, in a great degree, affect the develope- 

 ment of the Coal beds ; for it may be remarked, that in general we find 

 the Coal beds increase, not only in extent but also in number and thick- 

 ness, when the strata become flat. This part of the district requires, 

 however, a more minute examination. 



Passing the eastern edge of the Cheviot Hills, we find the central beds 

 of Limestone dipping east underneath the Basaltic hills, west of Belford. 

 On rounding, however, the north-eastern edge of the Cheviot, we find 

 the strata take a more northerly rise ; the upper beds of Limestone dip- 

 ping south-eastward under tlie Basalt, and their basset face stretching 

 away towards the sea south of Scremerston, where by the coast Section 

 they are seen rising north. This rise of the strata, west along the face 

 of the Basaltic hills, from Belford to near Lowick, and north and west 

 along the line of the coast, throws out in succession the different beds 

 of Limestone to the surface. The lower beds, however, as they recede 

 from the influence of the Cheviot Hills, and probably become affected 

 by the transition hills north of the Tweed, gradually flatten out and 

 stretch away up the vale of the Tweed in the form of an elongated basin, 

 the edges of which rise up against, and repose upon, the base of the 

 transition hills of the Cheviot and Lammermuir. Lower down the Tweed 



