PLANTS IN THE VALLEY OK THE GARNOCK. 249 



lower carboniferous strata over which it flows for 

 the rest of its course. At Gilfertlancl the Caaf 

 receives the Auldmuir Burn, which rises in the 

 south end of Baidland Hill ; and at Drumcastle the 

 Munnock Burn enters, which flows from Gill Hill, 

 passing Knockewart and Coalhill on the right. 

 From Drumcastle to Linn the Caaf passes through 

 a fine glen, about a mile in length, on which is situated 

 the highly picturesque Falls of Linn (locally known 

 as the "Linn Spout"), and enters the Garnock at 

 " the Plumb " near Kilcush. The Bombo rises in the 

 neighbourhood of Beith, and enters the Garnock on 

 its left side a little below Kilcush. For the last 

 three miles of its course it runs near the foot of 

 the conspicuous outcrop of dolerite which divides 

 the upper limestone strata from the base of the 

 true coal measures. 



The Dusk runs a long course of about eleven 

 miles, and joins the Garnock opposite Dalgarven. 

 Its first four miles are over porphyritic rocks south 

 of Castlewalls, and the remainder over carboniferous 

 limestone strata. From Lowhouse Loch, on the 

 north side of Cuff Hill, a small stream descends to 

 the Dusk. On its right side, for the last four miles 

 of its course, the Dusk has the same dolerite rock 

 which is so conspicuous along the left bank of the 

 Bombo. 



The Lugton rises a short distance north-east from 

 Loch Libo ; and after passing through the loch, it 

 pursues a south-east direction for twelve miles, 

 joining the Garnock at Dirrans, near Kilwinning. 

 Here and there, for the first six miles of its course, 

 it is rather a sluggish stream ; and the farmers of 

 former days have in many rjlaces confined it within 

 stone walls with the view of keeping its waters 

 within bounds, for evidently at one time it has 

 flowed through a series of narrow shallow lakes. 

 From Auchentiber downwards it flows more rapidly, 

 exposing many fine sections of lower and upper 

 carboniferous rocks. From Loch Libo to its junction 



