180 Mr. WiTiiAM on the Red Sandstones of Berxdckshire. 



Having now ascertained the relative positions of the rocks along this 

 length of coast,* it became necessary to examine the rocks further up 

 the country, to ascertain whether they lay in similar positions with re- 

 spect to the Limestones and Shale beds. For this purpose, therefore, 

 I started at Carfrae-mill, two and a half miles north of Lauder. I here 

 found in the bed of a brook, the Red Sandstone ; although in the imme- 

 diate neighbourhood of Grey wacke, I was unable to find it reposing 

 upon it. I cannot, however, entertain a doubt that it does so. From 

 Lauder to the neighbourhood of Greenlaw, I in vain looked for any 

 exposed rock, the whole country in this neighbourhood being covered 

 with a thick diluvial deposit, much ferruginated. At the bridge of 

 Greenlaw, there is a beautiful section of the Red Rock, 12 feet thick, 

 seen rising 14° in the direction of north, Q5° east. From Greenlaw, 

 creeping round the southern front of the Transition range of the Lam- 

 raer-muirs, at a short distance is thrown up a Felspar Porphyry. Ad- 

 vancing to the east you come into the neighbourhood of Polworth where 

 again is seen the Red Sandstone accompanied with its conglomerate. 



In the neighbourhood of Dunse, about a mile south of the town, you 

 have a fine display of a light-coloured Sandstone, filled with vegetable 

 impressions. The bed is 23 feet thick of solid stone. It dips towards 

 the south at a trifling angle. 



At St. Helen's, two miles east of Dunse, beds of shivery Sandstone 

 and Shale, containing nodules of Ironstone, occur., 



Below Churnside Bridge, are found several thin beds of very compact 

 Limestone, of a blue colour, alternating with Sandstone and Shale, and 

 forming bold cliffs. Near the bridge is a thin bed of the Red Rock. 

 At Eddington-mills, and Blue Braes, the Red Rock agjain presents 

 itself, in beautiful escarpments, and is of great thickness. It contains 

 veins and nodules of fibrous Gypsum, and dips at an angle of 16° W. S. W. 



Again, at Allanbank-mill, near the junction of the rivers White and 

 Black Adder, in a thick bed of Shale, (belonging undoubtedly to the 

 same series of beds which, is seen near Ghurnside Bridge, and Edding- 



* In.afuture paper I hope to be able to trace the relative positions of these rocks in Had- 

 dingtonshire, and Midlothian. Mr. Hay, of Spots, is now boring for Coal at Eastburn 

 about two and a half miles south of Dunbar. 



