1858.] 



HARZNESS JOINTINGS . 



89 



Fig. 2. — Joints {N. and S.) in the Carboniferous Limestone at 

 Ballintemjple, Co. Corh. 



in the quarry at Little Island (fig. 3) : and here, where it intersects 

 the perpendicnlar N. and S. joints at nearly right angles, it gives to 

 the face of the rock a prismatic aspect. 



Fig. 3. — Joints (horizontal) in the Carboniferous Limestone at Little 

 Island, Co. CorTc. Looking North. 



Another course which jointing assumes among these limestones 

 is in a form which, to some extent, may be regarded as somewhat of 



