124 



Proceedings of the Royal Irish Academy. 



437 



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Donabate Coast — continued. 



Frequent and close jointing on soutli side of Lough. 

 SMnney, ........ 



Nortt-east end of Lough Shinney, fault 'with fUJing of 

 boulder conglomerate, badly-defined, 



Another joint to west of last-mentioned, 



Farther north, near limekila, ..... 

 Bed of Dolomite con-esponding to a saddie-back, 

 about 150 yards north of UmekiLn and approximate 

 axis, lN°i- 55°-56° "W. 



Cross jointing, 



Occurrence here of frequent jointing, .... 



Joint in connexion with slate clay boulders and conglo- 

 merate beds, ........ 



(The boulders apparently of Silurian or Cambrian 

 formation.) 



Great open joint, accompanying this, and repeated, 



Jointing repeated and Dolomiti^ed, 



Crossed by a well-marked fault, .... 



Frequent jointing here (200 yards south of old house), 



Very long open joint here, ..... 



Jointing thin, with Dolomite filling, 



(About 100 yards south of old house.) 



Cave or open joint, with conglomerate filling, in lower 

 part undergoing decomposition (an old level apparently) 

 the rock outside cave very much jointed, . 



Cross jointing, ....... 



Near old house, ....... 



At old house, ....... 



Clay-slate conglomerate beds come in here, ^yith. joint 

 ing, well-marked, cutting these, and running towards 

 Shenick's Island, ..... 



Another set of joints here, .... 



Beds of Dolomite, dipping north by east, and traversed 



by Dolomite joints (about 1 mile fi'om Skerries, 

 Joints in beds under Dolomite, 



,, limestones, f mile south of Skerries, 



,, ,, ,, frequent, . 



,, ,, well-marked and vertical, 



„ „ ,, and repeated, 



2--3- 



E. 



o2=-53° 



W. 



28°-29° 



w. 



28' 



w. 



32'-33=' 



io°-ir 



8^-9° 

 6°-7= 



20°-21° 

 34°-35° 



5°-6'' 

 34°-35° 



2''-3° 



28°-29° 



26°-27° 



31° 



18"-19= 



E. 



24°-25" 



E 



27° 



E 



3r-32° 



E 



13°-14° 



E 



47°-48° 



W 



24°-25° 



E 



13°-14° 



E 



56° 



W 



54°-55' W. 



27°-28° E. 



34°-35° E. 



29°-30° W. 



14=-15° W. 



14°-15° E. 



W. 

 W. 



E. 

 E. 

 E. 

 E. 

 E. 

 E. 

 E. 

 E. 



