236 Proceedings of the Royal Irish Academy. 
DETAIL OF OBSEEYED DIRECTIONS AND LOCALITIES. 
Bray Head. 
„ T J r> 1 Direction relative T^• 
No. Locality and Remarks. to true North. ^'P' 
521 At gate-house entrance to path round Head ; 
Cambrian slates, 79"27'E. N.N. W. at 46' 
522 On shore, not far from entrance ; open joint 
or fissure, cutting rocks, . . . . 9 3 W. To E. 
523 At N."W. point of shore ; little creek in rocks, 
apparently on a fault or joint, . . . 63 27 E. 
Do. do. do. do., . . 66 27 E. 
624 At N.W. point of shore ; another joint quite 
close to this, 50 27 E. 
525 On shore, near commencement of path : 
fissure, 1 27 E. 
526 Bathing-place ; purple slate-rocks on S. side 
of, 45 27 E. N.W. at 60". 
527 Bathing-place; marked jointing in rocks here, 74 3 W. 
528 Do. do. do. do., . . 79 3 W. 
529 S. of hathing-place ; cave on shore here, . 25 27 E. 
530 S.E. point of bathing-place ; joint at, . . 23 57 E. 
531 S.E. of bathing-place ; great fault, . . 28 27 E. 
632 80 yards S.E. of this fault ; joint in rocks, . 87 3 W. 
533 About 40 yards S.E. of last ; great joint and 
fault, with sinter formation, . . . 81 33 W. S. slight. 
534 Eastern end of sustaining- wall on shore ; 
joint here in rocks producing an arch, . 89 3 W. 
535 On path; apparent bedding of rocks a few 
yards to S. of 522, about 100 yards from 
commencement of path, . . . . ol 27 E. N.W. 
536 Eailway-cutting near bridge ; apparent strike 
of beds on S. side of railway, . . . 80 57 E. 
537 On path, quarry ; beds of purple slate-rock 
in quarry, 37 27 E. N. at 44°. 
538 These beds crossed by a dyke, . . . 24 33 W. Vertical. 
539 Gully (1st) ; corresponding to a fault, seem- 
ingly ; the axis of the gully running to- 
wards the Periwinkle rocks, . . . 77 27 E. 
540 Commencement of wall beyond 539 ; direc- 
tion of beds here, 73 27 E. N. at 77°. 
541 200 yards S.E. of this; jointing in rocks, . 18 27 E. 
542 100 yards S.E, of quarry on path; beds of 
purple slate-rock, 80 27 E. N. at 65°. 
543 30 yards further S.E. ; well-marked purple 
beds (cleared), 14 27 E. N. at 67°. 
(The rocks in the interval between 542 and 
543 very confused, showing in some places 
concretional formation and mammillated sur- 
faces.) 
