M'Henry — Report on the Ox Mountain Rochs. 37-3 



the similarly circumstanced limestones of Donegal and Galway, or into 

 u serpentinous rock when the igneous masses of contact are basic. 



Examples of the former class of metaraorphism occurs in the 

 vicinity of Lough Talt, which lies in a north-west cross glen dividing 

 the Slieve Gamph from the Ox Mountain portion of the range, also at 

 one or two places to the north-west of Castlebar, while along the 

 north lower slope of Croagh Patrick Hill the serpentinous variety is 

 developed, as well as to the north of Castlebar, and elsewhere at 

 many points in Connemara. To the north of Castlebar, and between 



Inclusions of early sheared basic rock (B.) in later sheared acid granulite (C). 

 N. of Ballydawley Lake, 4 miles S. of Sligo. 



it and "Westport, the lowest pebbly grits are in strong evidence, and 

 show the passage stages and conditions from an original conglomeratic 

 grit or sandstone into a quartzite ; the metamorphism may be due, 

 however, to dynamic metamorphism, rather than to actual contact 

 with igneous masses. The quartz pebbles in this quartzose grit or 

 conglomerate can be seen to have been crushed and drawn out in a 

 remarkable manner, sometimes into riband-like forms, and even the 

 drawn out pebbles, puckered and contorted by subsequent movement, 

 and folding in the rock mass. 



