90 ON THE MltfEBALGGY OF THE 



bronze. The calcareous spar was distributed, so as 

 to exhibit the concentric layers of growth ; and the 

 glance-coal appeared chiefly in angular grains in 

 the spar, and likewise in the pyrites. 



In examining vegetable petrifactions, with the 

 view of determining, whether they are the remains 

 of monocotyledonous or dicotyledonous plants, we 

 must be influenced by the structure of the stem, and 

 the arrangement of the nerves of the leaves. The 

 first of these characters only, was here exhibited ; 

 so that, judging from the concentric layers of growth, 

 we are disposed to refer this vegetable petrifaction 

 to the class of dicotyledonous plants. 



These specimens of vegetable petrifactions were 

 collected, about a mile to the eastward of the city, 

 on the Glenmire road. About five miles south 

 from Cork, at Ballenhassig, a variety of the same 

 rock contains bivalve shells, but too much incorpor- 

 ated with the rock to exhibit their peculiar charac- 

 ters, 



The nomenclature which I have assigned to these 

 rocks, is perhaps faulty, as being in some measure 

 influenced by theoretical views. The striking re- 

 semblance between some of the rocks here describ- 

 ed, and those of some of the sandstone districts of 

 Scotland, appeared obvious to me at first sight ; and 

 had I been guided by this analogy, I would have 

 regarded all these rocks of grey-wacke-slate as va- 

 rieties of sandstone and slate-clay. But when we 



