O'Reilly — On Lines of Jointing of Bray Head, 8fc, 245 
Greater Sugar Loaf. 
Locality and Remarks. 
No. 
717 In Rocky Valley; first rocks at entrance of 
pass N.W. side, ..... 
718 Do. ; well-marked cross -jointing here, 
719 Do. ; jointing close to road marked and 
frequent, ...... 
Do. do. do. do., 
Do. do. do. do., 
720 Do. ; at N.E. end of ; Greenstone beds, from 
which road-metal taken, showing seams of 
cleaved slate -rock, .... 
Do. do. do. do,, 
721 Do. ; jointing in quartzite on S.E. side of 
pass, 
722 Do. ; main jointing in quartzite on S.E. side 
of pass, . . . 
723 Do. ; jointing on S.E. side of pass having 
given rise to clifFs, ..... 
Do. do. do. do., 
724 Do. ; jointing in another direction, 
725 Do. do. do. do., 
726 Do. do. do. do., 
Do. do. do. do., 
727 Do. ; great face on quartzite close to road 
much broken, and bent, general direction, . 
728 Do. ; jointing in quartzite face at S.E. end 
of pass (close and frequent), 
Direction relative 
to true North. 
Dip. 
7 27 E. 
84 33 "W. 
21 27 E. 
24 27 E. 
17 27 E. 
52 27 E. 
52 27 E. 
at 62° 
at 72° 
S.E. at 45°. 
S.E. at 35°. 
79 33 W. 
29 33 W. Vertical. 
77 3 W. 
80 3 W. 
36 27 E. 
1 27 E. 
10 33 W. 
11 3 W. 
84 27 E. Vertical. 
0 57 E. E. at 75°. 
Shankill Quarries. 
729 
730 
731 
732 
733 
strike of beds in, 
white quartzose ribs run^ 
Northern quarry 
Southern quarry 
ning through rock, 
Slope of hillside ; giving rise to gorge tread' 
ing towards Ballycorus works, . 
In northern quarry ; great fault with brec 
ciated filling, cemented by MnO'^ and 
Fe2 03, ..... 
Do. ; the beds dipping here at about 
Do. ; set of jointings in beds. 
83 27 E. 
11 57 E. Vertical. 
40 13 W. 
21 33 W. 
61 33 W.. 
28°. 
Carrickmines Station. 
734 Granite liill to S. of ; fault on joint in the 
granite having a milk-white quartz lining, 42 3 W. 
