Cole — The Picture-Rock or Scribed Rock near Rathmullan. 119 



commonly been converted into zoisite, calcite, and other minerals. In the 

 Picture-Eock, they are now, through the introduction of chlorite, pseudo- 

 morphs rather than reconstructions. 



The epidiorite condition does not seem reached in this particular intrusive 

 sheet, except in the neighbourhood of the rectilinear joints. There, however, 

 as we have seen, material has been added to the rock, and the bars of amphi- 

 ole have led to a local toughening. They have thus enabled it to resist 

 decay ; and it is satisfactory to have this microscopic evidence to explain the 

 outstanding walls of the'compartments, which are so conspicuous a feature of 

 the Picture-Eock. 



K. I. A. PROC, vol.. X.KVnl., SECT. B. \S] 



