34 Scientific Proceedings, Royal Dublin Society. 



PLATE IV. — Section of Unconfokmabilities — continued. 



Yig 3. Diagrammatic section, exemplifying the overlap of tte Later Eocks 



on to the Older Eocks (Kilmacrenans) in the Knoclybrin district, 

 north-east of Letterkenny. 



a. Kilmacrenans. S. Killygarvan grit series. 



B. Great quartzite. I. Lubber limestone and volcanic 



E. Cranford series. series. 



F. Milford schist series. /. Barnhill grit series. 



G. KUlygarvan volcanic series. 



PLATE V. — Veetical Sections, Cranford Series. 

 PLATE VI. — Vertical Sections, Hoenblendite Series. 



