1 14 Proceedings of the Royal Irish Academy. 



Shte Quarry stream, also between the Slate Quarry farm-house and its 

 Wtiou wiL the LittleRiver, shows some three cores -t transversely ; 

 and despite a fairly constant dip of 35° to 40°, the same Graptolite bed 

 aSet at the top, opposite the Catholic church, and at themr l- 

 Ti in the alluvkl flat at the base of the hill, as well as in the 

 ent'Vof a little fold which occurs half-way between the last two 

 otuties. The wa.e-length of the folds in tl>- sectu>n rs about 

 50 to 70 yards, the corresponding amplitude some 30 to 40 feet and 

 h?e Lensiois seem to be fairly characteristic '^^^^^^^^^^^ 

 whole district. Of other evidence, we may quote the fact that, at Mul 

 Siatoyah, the M. tri.n,uUtM^V -th at 75°, but reappea 

 immediate y on the other side of the river. At Lime Hill, also, the 

 sZm has'exposed two very well-marked anticlinal cusps, one of 



BARDAHCSSIUCH 



BROOK FROM 

 CROCKNAGARGAN 



SLATE LITTLE TIRNASKEA 



QUARRY RIVER BROOK 

 I • 

 I « 



TiRNASt 

 HILL 



sooo 6280 FUT 

 I MilC 



\ \ drift 

 i 1 tirnaskea 



\EDENVALE r^ SLATE QUARRY & CROCKNAGARGA 



.LEY BRIDGE ^%lft\BARDAH£SSIAGH . ^^T^GRANlTE 



Fig. 2. 



clear but at least three anticlinals are in evidence within the sma 

 i side area available for study, and one of these causes the b al 

 B!rdTessiagh beds to be seen in this rather isolated southern exposuie. 



In ea h of our diagrams the relationship of the Lo wer Pal^o.oi 

 rocks to the granite and hornblendic series below is left somewhat 

 vate wing to lack of evidence. As discussed in the stijtigraplu- 

 laf portiln o^f the paper, we believe that originally the Barda^,essiagh 

 beds rested unconformably upon the older series; but whethei this 



