Wynne — Notes on Glen-car Valley. 



345 



IV. — Notes on Glen-car Valley, Sligo. . 

 By A. B. W-raNE, F.G.S., etc. 



AEECENT visit to the picturesque lake-valley of Glen-car, about 

 seven miles N.N.E. of Sligo, has afforded an opportunity for 

 reconsidering the method by which the line precipices enclosing it 

 were formed. 



Viewed at a shorter distance the appearance of an anticlinal curve 

 intersected by the cliff, referred to and illustrated in the January 

 Number of this Magazine (Vol. IV. PL I. Fig. 5, p. 5), was found to 

 have been in this instance deceptive. The limestone strata are more 

 nearly horizontal than otherwise, while the appearance of an open 

 curve — see right side of figure referred to above — is given by three 

 parallel land-slips along the face of the cliff, letting down large 

 masses, so as to form the benches shown in the figure, and were 

 doubtless caused by fissures like those in Eig. 4 of the same plate. 



The cliffs do not overhang, and the profile of a portion of the 

 mountain as sketched from the lake,^ looking towards the mouth of 

 the glen (see Sketch, Fig. 1) does not show traces of former under- 

 cuttings by sea-breakers to have been the cause of these land-slips. 





Fig. L— Profile of cliff, looking towards the mouth of Glen-car ; sketched from the Lake. 



Several of these great slips occur in this locality. At a place 

 called the Protestants' Kocks, on the south or opposite side of the 

 glen, an immense flake or mass, many yards in length and height, 

 has slipped down from and now inclines towards the face of the 

 cliff, resting upon the talus at its foot ; and, though much weathered, 

 still shows the hollow of a ravine above, by which it was crossed 

 before the settlement took place (see Sketch, Fig. 2). 



Between the group of mountains in which this glen lies, and Sligo 

 bay to the west, are several long rising grounds running east and 



^ Two small islets, one at either end of the lake, are said to be " crannoges," or 

 old lake habitations. The evidence upon which this statement was made, is supposed 

 to have been obtained many years ago, when the lake was lowered by large ex- 

 cavations and alterations in the bed of the DrumclifF river, which forms its outlet; 

 but these have since then silted up so much that the lake is now said to maintain 

 nearly its old higher level, and the islets present merely the appearance of heaps of 

 stones. 



