CHANNELS AND GLENS OF AYRSHIRE. 55 



direction of Linncraigs, as below the drift-scaur the Caaf flows in 

 a rock-bound glen till some distance below the Linn Spout, where 

 it falls over a high ledge of upper limestone. 



Dusk Water. — The Dusk Water, from the great sandstone rock 

 at Ravenscraig (largely quarried now), runs for a considerable 

 distance through a rocky gorge, known in part as Cleaves Glen, 

 and in which the limestone cavern of Cleaves Cove is situated. 

 A study of the district leads me to think that the old valley of the 

 Dusk runs from between the Blair Tile Work (site) and Ravens- 

 craig, and to the west of Cleaves, joining the present valley above 

 Waterside. What lends particular emphasis to this view is the 

 manner in which the upper part of the large trap-dyke has been 

 cut off abruptly at Cleaves Cot, and in the hollow to the north of 

 this, the present stream cutting through this dyke near to the 

 solitary grave in the glen. The eastern side of the old glen is 

 bounded in part by the said dyke for a short distance to the south 

 of Cleaves Cot, and its western side partly by a prominent escarp- 

 ment of trap ; between the two there being a long drum apparently 

 of drift, very likely carried out by the last land ice. (See Figure 3.) 



Si jr. 3, JusA: #*.&*. 



Lugton Water. — The Lugton Valley at the Sevenacres Mill 

 (pronounced "Snakers") has rock on its west side and drift on its 

 east. Above and below this there is rock on both sides. The 

 drift at " Snakers " is where the present rock-bound stream has 

 made a breach through on to the side of the old valley by turning 

 suddenly to the left for a short distance, and as suddenly back 

 again. The old valley appears to run somewhere near Mont- 

 greenan and Fergushill. 



The Lugton in its lower reaches at present wheels to the west 

 and flows into the Garnock, but at one time it may have run to 

 the Irvine, as there is a drift-filled underground glen which forms 

 a continuation of it in that direction. 



