O'Beilly — On Jointing in Rocks about Dublin, ^"c. 135 



No. of Magnetic LOCALITY OF OCCURRENCE. Observations 



Join ing. Bearing-. 



280 81° W. Malahide Station Quarry. — 



312 78= W. Malahide Coast. _ 



356 79" "W. „ „ — 



358 84" W. „ „ _ 



359 85" W. „ „ — 

 381 80" W. „ „ — 

 384 82" 30' "W. Donabate Coast. — 

 389 83" 30' "W. „ „ — 

 476 78" W. Donnybrook, Dodder River, — 

 478 78" 30' W. „ „ „ — 

 497 78" 30' W. Gollarstown Quarry. — 

 572 83" W. Cork CoUege Quarry. — 



Number of Directions observed, 12. 



< / 46 



102" 14' W. 

 E. 



265 



71° 



w. 



284 



68" 



W. 



313 



70" 30' 



W. 



349 



72° 30' 



W. 



416 



72" 30' 



W. 



420 



75" 30' 



-w. 



427 



73° 30' 



W. 



472 



66" 30' 



W. 



564 



69° 



W. 



Killester Quarry. 

 Malahide QuaiTy. 

 Malahide Coast. 



Eush Coast. 

 Eush Harbour. 

 Eush Strand (Xorth). 

 Donnybrook, Dodder Eiver. 

 Crumlin Sand Quarry. 



Number of Directions observed, 9. 



8"" 40' 



92" 20' TV. 

 E. 



379 62" 30' W. Malahide Coast. 



True bearing, 83" 50' "W. 



343 55" W. Malahide Shore. Fault. 



357 56" 30' "W. „ „ — 



368 59" 30' W. „ „ — 



383 57" 30' W. Donabate Coast. — 



452 56" W. Skerries Coast. — 



525 55° W. Woodlands. — 



526 57" 30' "W. „ — 

 563 56° "W. Kimmage Quarries. — 



Number of Directions observed, 8. 



453' -i- 8 .= 56" 37' W. mean value. True bearin"-, 77"" o7' W. 



