O'Eeilly — On Jointing in JRocks about Dublin, 8fc. 125 



Donabate Coast — continued. 



469 Long joint, someTvliat wabbled in limestone, Avith. Dolo- 



mite lining, ........ 50^ W. 



470 Frequent jointiag, crossing beds J mile from town, 



opposite Slienick's Island, ..... 60' E. 



471 

 472 

 473 



474 

 475 

 476 

 478 

 479 

 480 

 481 

 482 

 483 

 484 

 485 



486 



487 



Dodder River, near Donnybrook : — 



[Direction of beds in river, about 100 yards to soutb of 

 foot-bridge, X""- 64°-66' E. Dip to east at 60'-70=.] 



Frequent jointing, crossing these beds just below tbe 

 weir, vertical, or only sligbtly inclined. 



Frequent and nearly vertical jointing, crossing bed of 

 river, ........ 



Tbe beds at weir dippiag towai'ds soutb-east at about 20" 

 The fall in the bed of the river produced by a series of 



joiats or faults running, 



Crossed by jointing at 



Above pond at ClonsUla Bridge, in flat beds of river. 

 Under wall of old quany, 



5) 5) 



Calcspar joint, crossing river bed, 



Dolomite joint in bed of river, about 50 yards north of 



old Minto\vn Bridge, 

 Do., do., 1 in. and 2 in. thick joints, frequent and 



close ; 15 to 20 observable in the river bed. 



Jointing without spar, and jagged, 



„ well-marked, extended, and frequent in bed of 

 river under old MHltown Bridge, 



42^-43' 



E 



66^-67" 



W 



50° 



E 



56°-57° 



E 



56° 



E 



78° 



\^ 



78°-79° 



W 



37°-38° 



E. 



22°-23° 



W. 



7°-8° 



W. 



16°-17° 



W. 



30°-31° 



E. 



32° 



E. 



30° 30' 



31°-32° 

 53°-54° 



32° 



E. 

 E. 



489 

 490 



491 

 492 

 493 

 494 

 495 

 496 

 497 



Wortliingrton Cluarry, GroUarstown Bridge, Grrand Canal : — 



! Great calcspar lode, 9 in. thick, cutting beds. 

 Dii-ection of beds, 'N'^- 54''-55° "W. . 

 Dip to south-west about 20° 

 Crossed by thin jointing. 



Joint in old quarry (ileade's), 

 Face of jointing, well-marked, 

 Cross jointiag on south side, 



5r-52° 



E 



52°-53° 



E 



5° 



E 



25°-27° 



W 



28°-29° 



W 



4°-5° 



W 



51°-52° 



W. 



2°-3° 



E. 



78°-79° 



W. 



