Yol. 56.] 



IGNEOUS ROCKS OF COUNTY WATEEFORD. 



659 



small intrusive masses or sheets piercing the bedded Ordovician rocks 

 — as, for instance, the light greenish felsite near the top of the series 

 in Newtown Cove, and a dyke in Doneraile Cove — the felsites are 

 associated with tuffs, of various degrees of coarseness and containing 



Fig. 1. — Cliff and foreshore on the south side of Newtown Head. 



..;;.■'•.,. ■ 



'"*"»fv 





A = Dark greenish-grey felsite. 

 B = Crush-zone, 3 to 8 feet wide. 



D = Dark green diabase, partly coarse and 

 partly fine-grained, the varieties graduating 

 imperceptibly one into the other. 



Fig. 2.— The east side of Waterfall Cove. (See]}. 660.) 



A = Crushed fine felsitic tuff. 



B = Very coarse felsitic tuff, in- 

 distinctly bedded. 



B' = Scarcely bedded, coarse greenish fel- 

 sitic tuff, with angular fragments of 

 black slate and of pink felsite. 



C = Intrusive sheets of trachytic andesite, 

 altering the felsitic tuffs at the contact. 



a large number of fragments of black slate. The first exposure of 

 such a type is met with on the south side of Chair Cove, near Great 

 Newtown Head. It consists of a light greenish-grey, compact and 

 cleaved ash, full of chips of black slate. Associated with it are a 



2i2 



