O'Reilly — On Jointing in Rocks about Dublin, ^c. 133 



No. of 



Magnetic 



LOCALITY OF OCCURR 



Jointing. Bearing. 





267 



32° 30' 



E. 



Tfillester Quarry. 



268 



32° 



E. 



> J J J 



301 



3P 



E. 



MalaMde Coast. 



302 



32° 



E. 



)> ?) 



305 



31° 30' 



E. 





311 



31° 30' 



E. 



JJ 3> 



317 



31° 30' 



E. 





330 



32° 



E. 





346 



33° 30' 



E. 



!) )) 



441 



32° 30' 



E. 



Drumanagh Coast. 



447 



31° 30' 



E. 



5> )3 



468 



31° 



E. 





483 



30° 30' 



E. 



Donnybrook, Dodder 



484 



32° 



E. 



J? )» 



485 



31° 30' 



E. 





486 



31° 30' 



E. 



)) )> 



488 



32° 



E. 



Old Milltown Bridge 



522 



32° 



E. 



Woodlands. 



529 



32° 30' 



E. 



Eatligar Quarry. 



631 



33° 30' 



E. 



,, ,, 



533 



32° 30' 



E. 



>) 



535 



31° 30' 



E. 



Leixlip. 



455 



34° 30' 



E. 



Skerries Coast. 



462 



34° 30' 



E. 



)) ,, 



464 



34° 30' 



E. 



M >) 



322 



35° 30' 



E. 



Malahide Coast. 



OBSERVATIONS. 



About 17 joints here. 



Number of Directions observed, 26. 

 841° -;- 26 = 31° 58' E. mean value. True bearing, 10° 38' E. 



435 



55° 30' 



E. 



Drumanagh Promontory. 



474 



56° 30' 



E. 



Donnybrook, Dodder Eiver 



475 



56° 30' 



E. 



)) )) )) 



528 



55° 30' 



E. 



W oodlands. 



542 



55° 



E. 



Leixlip. 



555 



58° 



E. 



Feltrim Quarry. 



Number of Directions observed, 6. 

 336° 30' ^ 6 = 56° -05' E. mean value. True bearing, 34° 45' E. 



Malahide Station Quarry. 

 St. Dolough's Quarry. 

 Donabate Coast. 

 Skerries Coast. 



Number of Directions observed, 4. 

 246° ^ 4 = er E. mean value. True bearing, 39' 40' E. 



285 



62° 30' 



E. 



295 



60° 30' 



E. 



387 



62° 30' 



E. 



470 



60° 



E. 



