126 ME. GARDINER AND PROF. REYNOLDS ON THE [May I9O9, 



rocks, and propose to refer to them very briefly. In the southern 

 part of the area, especially along the steep road over the hill from 

 Tourmakeady to Bohaun, and in the bed of the stream near which 

 the road runs for some distance, the rocks are finely exposed 

 and consist mainly of very coarse conglomerates. The blocks of 

 these conglomerates may reach a length of a foot or more, and are 

 chiefly red granite and quartz-felsite. Subordinate beds of grit are 

 associated with the conglomerates. 



A well-marked conglomerate, with pebbles chiefly of quartz- 

 felsite, rests upon the Llandeilo Beds near Gortanalderg and 

 stretches as far as Stream F, where it passes into grit, this 

 forming the prevalent rock all along the remainder of the western 

 margin of the area. The grit becomes pebbly in places, the 

 pebbles being of felsite or quartz. 



Between Streams G and H these grits occur in direct relation to 

 the green felsite, the two rocks being seen in juxtaposition in 

 Stream EL ; and from this point the grits, which are often pebbly, 

 show a fairly continuous series of exposures as far as Derrindaffderg, 

 where they disappear beneath the quartzose conglomerate and red 

 sandstone of the Carboniferous System. As regards the age of these 

 rocks, it is clear that they are newer than ths gritty tuffs and 

 limestones with Llandeilo fossils, and they show no lithological 

 resemblance to the sandstones with Llandovery fossils which occur 

 farther south in the neighbourhood of Trean ] and at the mouth 

 of the Owenbrin river. 2 We, like all previous observers, have 

 been unable to find any fossils in these rocks in the Tourmakeady 

 district; but Sir Archibald Geikie (' Anc. A 7 olc. Gr. Brit.' vol. i, 

 1897, p. 253) mentions that in the region farther south-west tbey 

 include bands with Bala fossils, and we are quite ready to accept 

 his and Mr. Kilroe's conclusions that these conglomerates are of 

 Bala age. 



1 We found here the following fossils in ferruginous grit: — Favosifes 

 hisiugeri, M.-Edw., Lindstramia sp., Palaocyclus sp., Lepfcena rhomboidalis, 

 Wilck., Ccelosjnrcc hemispherica, Sow., Encrinurus punctatus, Briinn., and 

 JBeyrichia sp. 



2 We found the following fossils in blocks of ferruginous sandstone en the 

 shore of Lough Ma sk, west of Black Eock, and north of the mouth of the 

 Owenbrin Biver : — 



Lindstroemia subduplicata, M'Coy. 



Lindstroemia sp. 



Favosifes sp. 



Crinoids. 



Orthis calligramma var. 



sowerbyana, Dav. 

 Orthis elegantula, Dalm. 

 Orthis reversa, Salt. 

 Orthis sp. 

 Ccelospira hemispherica, Sow. 



Pteriucea squamosa, M'Coy. 



Trochonema tricincta, M'Coy. 



Cydonema sp. 



Holopea sp. 



Pleurotomaria sp. 



Conularia sp. 



Orthoceras subgregariv.ru, M'Coy. 



Orthoceras sp. 



Encrinurus punctatus, Briinn. 



Phacops aff. downingia, March. 



llhynchospira baylei, Dav. Illcenus cf. macaUumi, Salt. 



