660 ME. F. E. COWPEE EEED ON THE [Nov. IQOOy 



pale-grey banded and perlitic felsite, and another of a darker colour 

 and blotched appearance, which likewise contain xenoliths of black 

 slate. 



Great Newtown Head to Garrarus. — West of Great 

 Newtown Head in Eonan's Bay, a tuff similar to that above men- 

 tioned has an apparent dip of 70° to 75° north-westward. A series 

 of compact greyish felsites and coarse ashes of similar composition 

 are met with near Little Island, and strike inland to the head of 

 Newtown-Cove Glen, where they are exposed in the fields. Greenish 

 or greyish tuffs of similar character, and apparently bedded, with a 

 steep north-westerly dip, extend westward along the coast to the cove 

 parallel with Hurahan's Eock. On the east side of Waterfall Cove 

 the admixture of many blocks of pink felsite with the slaty fragments 

 is noticeable for the first time in the tuffs, which are here coarser. 

 While the finer tuffs are apparently stratified (fig. 2, p. 659), the 

 coarser portions rarely show any regular bedding, and at the head of 

 Waterfall Cove they pass into an agglomerate wherein the materials 

 are confusedly heaped together. The pink felsitic fragments from, 

 this point westward constitute an important element in the tuffs ; 

 but in the finer beds on the east they are small and rare. 



In the townland of Coolnagoppoge, similar beds are found, being 

 a continuation inland of those on the coast. 



The volcanic rocks so far described appear to form a stratified 

 series overlying the Ordovician beds (Tramore Limestones, etc.),. 

 with the same general dip. The appearance of bedding is espe- 

 cially evident near Great Newtown Head. Their exact relations, 

 however, cannot be determined ; and in the absence of direct evidence 

 from interbedded fossiliferous rocks, we can only say that they are of 

 later date than the youngest proved Ordovician beds. The fragments 

 of black slate have probably been derived from some of these beds ; 

 but the original home of the pink felsitic fragments is doubtful, no 

 rocks of this type having been discovered among the Ordovician 

 Series. From the fact that these bedded grey tuffs and felsites have 

 suffered the same disturbance as the fossiliferous rocks, and are 

 pierced like them by many subsequent intrusions of felsite, diabase, 

 dolerite, etc., we may definitely infer that they do not belong to 

 the latest period of igneous activity in this locality. West of 

 Garrarus there are practically no traces of bedding, and xenolithic 

 felsites are very common. 



Garrarus. — Proceeding now farther westward to Lady's Cove,. 

 Illaunacoltia, we find a scarcely bedded pink felsite, apparently over- 

 lying coarse greenish felsitic breccias crowded with pink felsitic 

 fragments. A series of thinly-bedded dark-bluish felsites occurs here 

 at the base of the section, and resting conformably upon them are the 

 coarse greenish breccias with pink felsitic fragments and chips of 

 black slate. Above the breccias comes the pink felsite : this is not 

 of the same type as that of which fragments occur. Several small 



