O'Eeilly — On Jointing in Rocks about Dublin, 8fc. 127 



Woodlands — continued. 



525 Cross jointing, 55° "W. 



526 Large joint in rocks, near Hermitage, .... o7'-58° "W. 



527 Great face of rock, near gate honse, on east side, . . 17^-18' E. 



(The bedding dipping slightly towards north at a low 

 angle. The shaft for lead sunk to 130 feet fi'om 

 surface, a level driven 150 feet long on main joint. 

 Black iron pyrites shales at bottom. The rock 

 highly loaded with crystalline quartz.) 



528 Between the two shafts nearest river, the dii'ection, . 55'-56° E. 



Eathgar Quarry : — 



529 Face of jointing frequent on east side under main road- 



way, 32'-33=' E. 



530 Jointing frequent and close in mass of rock, supporting 



the engine and pumps, ...... 43'-45° E. 



531 ,, ,, ,, ,, ,, „ ,, ,, . SS^-Si" E. 



532 On north side of quarry, jointing forming face here, . 68^-70^ E. 



533 Thick sparry jointing, cutting south side vertically, . 32''-33'' E. 



Leixlip : — 



Direction of bed in river, near bridge, . 45^-46^ E. 

 Dip to west at about 30'. 



534 Jointing in quarry, east of Salmon Leap, . . . 37" E. 



535 „ ,, ,, „ ,, ,, ,, „ . 30"-33= E. 

 Direction of beds in this quarry, . . 42'-43° E. 



Dip about 30" towards river bed. 



536 Near the Leap, face of joint forming margin of river 



(weU-marked), 14°-15° E. 



537 „ „ „ „ „ „ „ „ • 16"-17" E. 



538 Jointing in beds within 50 yards of Leap (sparry), . o2"-53" W. 



539 „ „ ,, ,, „ ,, „ „ . 53°-o4" W. 



540 Crossed by rugged spany jointing, .... 17°-18° E. 



(Seamed or "gash" jointing in the beds here.) 



541 Cross jointing, ........ 2°-3° E. 



542 Jointing, not sparry, 55" E. 



543 Jointing in quarry outside town, on road to Maynooth, . 25"-26 "W. 



Feltrim. Quarry, near Malahide : — 



544 Jointing near road, ....... 47"-48" E. 



545 „ „ „ 28"-29' W. 



546 Vertical joint in quany, well marked and shoAving copper 



ore, 38"-39" E. 



- ,_ I Great rough face in old part of quaiTy, to the east, evi- \ nqo w 



- ,o < dently representing a maiu joint system, the face > Q.9-,_n3o vy' 



( broken and scarred by jointing, ....)" 

 549 Great joint, filled with brown clay, and associated with 



a system of parallel and close joints ; vertical, . . 43"-44" E. 



