O'Eeilly — On Lines of Jointing of Bray Head^ 8fc. 241 
No. 
626 
Locality and Remarks. 
Direction relative 
to true North. 
Dip. 
631 
632 
633 
634 
635 
636 
637 
638 
639 
640 
641 
642 
643 
644 
The quartzite beds which appear to cut off 
these traversed by sets of joints, 
Do. 
do. 
do. 
do., 
Do. 
do. 
do. 
do., 
Do. 
do. 
do. 
do., 
Do. 
do. 
do. 
do., 
627 
Do. 
do. 
do. 
do.. 
628 
Do. 
do. 
do. 
do.. 
Do. 
do. 
do. 
do.. 
Do. 
do. 
do. 
do., 
629 
10 yds. 5 
5.E. of quartzite outcrop 
slate-rocks, 
630 
Further E.; do., 
beds of 
40 yards S.E. of contact : greenstone slate 
rock much plicated. 
200 yards S.E., near boundary-wall; beds of 
purple slate-rock, ..... 
Eoundary-wall on hillside, over gate-house ; 
beds, ....... 
Do.; face of rock here (fracture), 
Do. do. do. do,, 
Do. do. do. do., 
250 yards S.E. of 13th mile post of railway; 
in grove ; well-marked fault, the rock sur- 
face showing mammillations. 
Do. do. do. do.. 
In grove further S. ; same fault, ]N''^/S"', 
Do. do. do. do.. 
Jointing in quartzite to W. of fault, showing 
traces of bedding, N™/S™, 
In grove ; the fault cut off at S. end by a 
joint, 
Jointing here, ...... 
Cut by a system of joints, close and frequent, 
and seemingly having determined the N.W. 
face of the rock mass looking towards Bray, 
Do. do. do. do., 
Higher up hill; joint cutting the quartzite, 
and showing well-marked face. 
Well-marked joint, cutting off this quartzite 
mass on the E., ..... 
Greenstones, about 80 yards N. of great fault 
(635), 
Face of jointing, representing apparently the 
system of fissuring having given rise to the 
divisions between the summits of the Head, 
23 57 E. 
13 27 E. 
11 27 E. 
14 57 E. 
14 57 E. 
17 33 W. 
14 33 W. 
14 27 E. 
11 57 E. 
63 27 E. 
77 27 E. 
S.E. at 74° 30'. 
S.E. at 65". 
N.W. at 57". 
34 27 E. N.W. 
57 E. 
33 W. 
3 W. 
33 W. 
11 33 W. 
24 33 W. 
21 33 W. 
16 33 W. 
21 33 W. 
11 27 E 
15 33 W. 
45 57 E. 
46 27 E. 
N.W. at 66°. 
Nearly vertical, in 
places to W. at 
70°. 
W. at 55° 
76 27 E. N. at 50°. 
11 33 W. E. at 59° 
65 27 E. 
52 33 W. N.E. at 70° 
