Mr. WiTHAU on the Red Sandstones of Berwicksliire. 



177 



Berwick to the river Tweed, immediately opposite to the Castle rock, will 

 be apparent. 



I shall now proceed to describe the rocks on the north side of the 

 river Tweed. Beginning at the west end of the Castle cliff at Berwick, 

 we find a very fine white-grained Limestone, dipping rapidly to the 

 east, and overlaid by a bed of Sandstone, 12 feet thick, of an unusually 

 white colour, apparently partially decomposed (probably by proximity 

 to a Basaltic Dyke). The Limestone again is overlaid by a Sandstone, 

 having the characters of a Coal Sandstone. This is about ten feet 

 thick, and is overlaid by a seven or eight feet bed of peculiar nodular 

 Limestone, striated with beds of White and Red Shale, on it reposes a 

 bed of Sandstone, which is overlaid by a very ferruginous Sandstone of 

 considerable thickness. Again, under the eastern ramparts is a soft 

 Red Sandstone, dipping east 55°, and about 80 yards further north, is a 

 bed of Limestone several feet thick, and overlaid by a very thick bed 

 of Shale. At a short distance, is a two-feet Limestone, and eight or 

 ten yards further are two beds of Limestone, overlaid by a thick bed of 

 Shale, and dipping east 64°. Twenty yards further is another thick 

 bed of Limestone, where it and the Shale are so singularly contorted, 

 as to render it probable that the same beds are repeated in this part 

 of the cliff. The representations (in Figs. 4 and 5), give but a 



Fig. 4. 

 SECTION OF A SLIP DYKE, A DOWNCAST TO THE SOUTH, ABOUT HALF 

 A MILE NORTH OF BERWICK. 



North. 



