O'Eeilly — On Jointing in Rocks about Diihliu, ^c. 117 



Sandyf ord — con timied. 



261 Jointing in smooth face of rock mass close to road leading 



to Harold's Grange, 47''-48'' W. 



262 „ „ „ „ „ „ „ „ „ . 45°-46° W. 



263 „ „ „ „ „ „ „ „ „ . 49°-50' W. 



264 Direction of axis of gorge lying due north, of Three Rock 



Mountain summit, ....... 8°-10° E. 



265 



266 

 267 

 268 

 269 



Killester Q,uarry : — 



Three joints in incUned face of limestone hed near rail- 

 way bridge, ........ 



Broad J in. calcspar joint in same face, 



Calcspar joint in rock further west, . . . , 



Close joint near bridge, . . 



109" 



E. 



5P-52° 



W. 



32°-33° 



E. 



32° 



E. 



15° 



E. 



270 

 271 



272 

 273 

 274 

 275 

 276 

 277 

 278 



279 



280 

 281 

 282 

 283 



284 

 285 



286 



287 



Malaliide duarry, near Station : — 



Joint on east side of line at old signal post, . 

 Face of joint in quarry on west side of line, nearly ver^ 

 tical, ........ 



Eagged sparry cross joint at end of this, nearly vertical 

 Plain joint, nearly vertical, ..... 



Set of parallel joints, well marked, nearly vertical. 



Face of joint, about 15 yards long, nearly vertical, dip 



(as in case of all this series) about 85° to E., 

 Very broken and principal joint with ochreous filling. 

 Strike of beds here, . . . N«>- 70°-72° W 

 „ „ „ . . . 68° W 



Dip, 18° towards JST 



Cross joint (dipping N. at about 70°), . 



( „ „ „ 75°), . . . 

 Joint dipping E., 



Cross joint evidently principal, but not well defined in 



extent, ........ 



Cross joint on east side of railway (approximatively) , 

 Ci'oss joint on east side, indistinct, but evidently im 



portant, with purple ochre lining, 

 Similar joint, about 4 yards N. of last, with altered 



ochreous mass between, ..... 

 Face of joint on east side, broad and long, evidently a 



continuation of a joint on the west side of railway. 



W. 



15°-16° 



E 



90° 



W 



Nm- S"!' 





3°-4° 



E 



r 



E 



Nm. §•»• 





3° 



E 



Nm. S">- 





4° 



E. 



81° 



W. 



92° 



W. 



3°-4° 



E. 



86° 



W. 



68° 



W. 



62°-63° 



E. 



67°-68° 



E. 



40° 



E. 



