Mr. Winch on the Geology of the Banks of the Tweed. 87 



the presence of gypsum and selenite in the beds at Carham, 

 Wark Castle, and on the Whiteadder, are coeval with the 

 encrinal limestones, and we may safely refer the red beds for- 

 merly quarried at Lindesfern, and that accompanied by coal 



and 



