KiNAHAN — A Neiv Reading of the Donegal Rocks. 33 



Kilmacrenans were subjected to their first metamorphism ; another 

 intrusion took place subsequently, but prior to the accumulation of 

 the Great quartzite, as in no place does one of the granites belong- 

 ing thereto penetrate it. This was followed by a very recent 

 intrusion, later than all the great disturbances. This is evident 

 from the fact that, in the north country, the elvans and felstones 

 from the granite laccoliths are nearly intact. 



EXPLANATION OF PLATES I. TO VI. 



PLATE I, — General Section of the Donegal Schistose and Gneissose Rocks. 

 PLATE II.— Inishowen. Diagkammatic Section. 



PLATE III. — Section of Unconformabilities. 



Fig. 1. — Section, Knockanteenbeg. 



Figs. 2 and 3. — Section, one mile north-east of Treantagh. 



{Scale, 6 inches to 1 mile.) 



K. Kilmacrenans. W. Whinstone. 



I. Limestone. ^8. Baked rocks, 



s. Sericites. F. Faults. 



g. Quartzose grits. UP. Upthrusts. 



c. Conglomerates. TT. Unconformability. 



PLATE IV. — Section of Unconformabilities. 



Fig. 1. — Section, one mile west of Kilmacrenan. 

 Fig. 2. — Section, Kilmacrenan. 



{Scale 6 inches to 1 mile.) 



