Vol. 65.] CARBONIFEROUS LIMESTONE OF COUNTY CLARE. 545 



Ballyconreagh, and again passes inland forming the huge amphi- 

 theatre of Bally vaghan. This is a magnificent dry valley, bounded 

 on three sides by steep terraced cliffs, and opening to the north on 

 Galway Bay. 



Fig. 5. — Foot of tlie main escarpment, showing scree-formation : 

 Burr en (Glare). 



J. A. D. photogr. 



The insignificant Eathborney River disappears underground at its 

 southern end, and flows to the sea by a subterranean course (see 

 footnote, p. 539). The escarpment then forms the southern shore of 

 the bay as far as the conspicuous promontory of Black Head, which 

 a short distance inland rises to over 1000 feet. Here it turns south- 

 wards, and dipping down to sea-level, passes beneath the Coal' 

 Measures 1 near Fisherstreet. This western margin is interrupted by 

 the valley of the Caher River between Slieve Elva and Black Head. 



1 These beds have been shown by Dr. Wheelton Hind (op. cit.) to be the- 

 homotaxial equivalents of the Pendleside Series and the Millstone Grit. 



2p2 



