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PEOCEEDINGS OF THE GEOLOGICAL SOCIETY. 



[June 9, 



the character of strike-joints ; but this description of joints has only 

 very partial representatives in the joints immediately referred to. 

 These joints are generally inclined at a considerable angle, usually 

 approximating 45° : in some instances dipping west, and in others 

 east. These inclined joints are generally secondary to the other 

 two forms ; and, where they make their appearance, are in all in- 

 stances accompanied by the N. and S. joints, and commonly also by 



JFig. 4. — Joints (N. and S., horizontal, and inclined) in the Carboni- 

 ferous Limestone at Ballinure, near Black RocTc, Co. Corh. Looking 

 South. 



the horizontal joints previously alluded to. They are, however, less 

 common than the other two descriptions. The whole three series 

 are well seen in the quarry at Ballinure near Black-Rock (fig. 4), 



Fig. 5. — Joints {three courses) in the Carboniferous Limestone on the 

 north face of Glasheen Quarry, near Corh. 



