Mr. N. Wood on the Geology of Northumberland, S^c. 313 



of beds of Red and White Sandstone. The lower beds of these Red 

 Sandstone rocks rise out to the west, from underneath the Coal and 

 Limestones, at the mouth, and on the south bank of the Tweed, and gra- 

 dually flatten westward ; — they are extensively quarried at Tweedmouth. 

 Below this, is a continuation of similar beds of Red and variegated 

 Sandstone, and Shale, with occasional thin beds of Limestone, which 

 form the predominent rocks up the vale of the Tweed, for a consider- 

 able distance from the mouth of that river. But as we shall have oc- 

 casion to refer to that part of the district hereafter, I shall, for the 

 present, pass them over, referring the reader to Mr. Winch and Mr. 

 Witham's Papers, in Trans. Nat. History Society, vol. i. part 2, for a 

 more particular description of these rocks. 



The seams of Coal, worked in this district (jsee Mr. Winch's Paper, 

 Trans. Nat. History Society, vol. i. p. 129), eight in number, occur 

 near the bottom of the above series of Sandstone, Limestone, and 

 Shale, and rest upon, and immediately above, the Red Sandstone of 

 the Tweed. And as these rocks side out from underneath the Basalt, 

 at Bamburgh, in every way corresponding with the beds of Limestone, 

 &c., at Beadnel and Sunderland, which may be traced rising out from 

 underneath the Basalt of Dunstanburgh, and the superior Grit rocks 

 south of Howick ; little doubt can exist, from an examination of the 

 coast Section alone, of the Geological position of these Seams of Coal, 

 and their accompanying beds of Red Sandstone ; that they occupy a 

 position in the lowest of the series of the Carboniferous Limestone for- 

 mation, and below the great central deposit of Limestone. 



The two gentlemen previously named, having, in their examination 

 of the rocks of the Tweed, given particular descriptions of the Minera- 

 logical character of these rocks, it is rendered unnecessary for me to re- 

 peat any further description in this paper, more than to state, that the 

 Limestones exhibit all the characters, and contain the same organic re- 

 mains as the Mountain Limestones. The Red Sandstone is essentially 

 different in mineralogical character, though probably not far distant in 

 geological position from the Old Red Sandstone. The object of this 

 part of the paper being, however, more particularly to trace the position 



