78 ME. GAEDIXER A^^D PROF. EETXOLDS ox THE [Peb. 19x2, 



a baud interbedded with the spilites or breccias, patches of which 

 protrude through the peat at various points in the neighbourhood. 

 In the cherts and shales we found the following graptoHtes : — 



Didymograptus extensus Hall. 



Bidymograptics i}rotobificlus=nanus Ij^^-^. (common), 



Tetragraptus sp. 



Also a single specimen of what Dr. H. T^'oodward considers to be 

 a new species of phyllocarid crustacean ; this is described in the 

 Appendix (p. 99). The graptolites, which have been kindly ex- 

 amined by Miss G. L. EUes, D.Sc, indicate that the Kilbride beds 

 belong to the same horizon as the graptolite-bearing beds of Let- 

 tereeneen in the Glensaul area, that is, the zone of Didymograptus 

 extensus. 



Though radiolaria are not so well seen in the cherts from Kilbride 

 as in those from Tourmakeady and Glensaul, they are undoubtedly 

 present in a rock (89) ^ from opposite Oak Island. 



(2) A band of grit some 15 feet thick occurs among the spilites 

 south of Oak Island ; it is truncated on the east by the Glenbeg 

 felsite, and bisects the more westerly of the two smaller felsitic 

 intrusions. 



The narrow sedimentary bands, which occur in places interbedded 

 among spilites or breccias, are best described with the rocks with 

 which they are associated. 



(5) The Breccias. 



In the western part of the Kilbride district, as in that of 

 Glensaul, coarse breccias play a prominent part. In the country 

 west of the Glenbeg felsite-mass bauds and areas of breccia are 

 associated with the spilites. East of the Oak Island Fault, and 

 to a less-marked extent south-east of Lough jVIweelaun (where 

 the strike is west-souith-westerly), and north and north-west of 

 Lough Mweelaun (where the strike is south-easterly), the breccias 

 form fairly well-marked bands ; while in the district north and 

 west of Finny the breccias occur in more irregular masses. It is 

 possible that certain of these breccia-masses may mark the position 

 of vents, as, for instance, the great mass in the south-western 

 corner of the district ; but of this we are not confident. South and 

 west of Lough Mweelaun a very coarse breccia stands up in great 

 ice-worn elevations, in a very striking and characteristic fashion. 



The breccias are of two distinct types : in the one, and far the 

 commoner case, the fragments are of felsite, in the other of spilite. 

 As a rule, the two varieties are not intermingled, but sometimes 

 they are. The felsitic type of breccia, though generally distributed, 

 is especially prevalent in the district west of Lough Mweelaun. 



In addition to these two types of breccia, both of which are of 



^ These numerals in parentheses indicate the localities marked on the map 

 (PI. YI) where specimens were collected. 



