CHANNELS AND GLENS OF AYRSHIRE. 



6l 



them of considerable height, and in the policies of Dumfries House, 

 the plantations, old river-terraces, and alluvial flats in this part of 

 its course, form some rather picturesque scenery. Below the 

 Barturk scaur the Lugar runs between perpendicular walls, first 

 of volcanic rocks —the framing of the Permian sandstone— and 

 then through the Permian sandstone itself, its old valley being 

 some distance from its left bank. Before the Lugar reaches the 

 Ayr it cuts across part of the drift-filled valley of that river, its 

 old scaurs being either covered with grass or trees. 



Water of Coyle.— The Coyle from Coylton to its junction with 

 the Ayr makes numerous very picturesque windings, sometimes 

 in deep rocky glens, and in this respect is not rivalled by any 

 other Ayrshire stream. It would take a great deal more study 

 than I have given to unravel the positions of the old drift-filled 

 glens, so that I have not shown any of them on the map. In the 

 neighbourhood of Rankinston it cuts at two places, for a bit, 

 through rock, trap at one part, and coal-measure shales, etc., 

 lower down. 



Carcow Burn.— A little distance below the junction of the 

 Glenshalloch Burn, the Carcow suddenly turns to the right and 

 cuts through 20 to 30 feet of greywacke, and immediately turns 

 to the left and again cuts through drift. This feature is well seen, 

 a high bank of clay and boulders standing fair in the line of the 

 old glen. The hill slopes bounding the Carcow here rise steeply 

 up from the old glen (See Figure 4). 



SIJ/V. 



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