EXCURSION XVI. 



195 



Black water-foot, a distance from Tnvercloy of eleven miles, 

 passing on the left, the glens of Craig-Dhu, Balmichael, and 

 the Clachan, and having a wild moor on the right, on whose 

 northern brow the tall standing-stones of the "Druid Circles" 

 aiTest our gaze. At two miles distance we pass Shedok 

 Inn, and two miles farther, turning sharp to the right, we 

 are at Black water-foot, the extremity of the vale of Shis- 

 kin. The unpretending little inn here will afford most 

 neat and comfortable quarters should we find occasion to 

 remain over night. 



93. On the south-west coast, in both directions from this 

 point, there occurs the greatest development in the island of 

 the felstone family of igneous rocks a peculiarity for which 



Fig. 35. 

 a, Sandstone ; b, broken band with cave below ; c c, claystone. 



it does not seem possible to assign any cause. At Black 

 water-foot a great body of indurated prismatic claystone 

 occupies the bed of the stream, the sides of the little port, the 

 shore for some distance, and a long line of inland cliff. Its 

 outgoings N. are lost amid the sands. In some places it 

 forms very perfect columns, with a near approach to the true 

 cup and ball jointing. In the cliff it intersects the sand- 

 stone in the form of great dikes; and in one place is seen to 

 turn up the eiids of the strata abutting against it ; in another 



