'300 Scientific Proceedings, Royal Dublin Society. 



when they were systematically looked for by Griffith and the 

 Hibernian Mining Company. 



In places in the Coal Measures good clay-iron-stone is found ; 

 but I cannot find any records of its having been raised or smelted 

 in old or modern times. Elsewhere, however, in the Carboniferous 

 Limestone and the Ordovicians, hematite and limonite were 

 raised for smelting in the seventeenth and eighteenth centuries, 

 and more recently for exportation (see Londonderry, page 288), the 

 localities being given in the List, Part I. 1 



Antimony has been found in the Munterlong Mountains, and 

 lead in Crockanboy and Trebane West, all near Grortin ; but none 

 of the minerals appear to have been worked. In the Silurians at 

 Crannogue, near Pomeroy, a little copper was raised ; while else- 

 where in these rocks, both in this county and also in Fermanagh, 

 there are traces and indications of this mineral, which would 

 suggest that, if properly searched for, a paying lode might be 

 found. 



Waterford. 



In the west of the county of Waterford is the eastern termina- 

 tion of the rocks of the Cork types, they gradually, eastward and 

 northward, changing into the ordinary Central Ireland types. 



To the eastward, coming in from the Co. Wexford, are Ordo- 

 vicians, with their associated, more or less interbedded, igneous 

 rocks ; and over these, to the northward, are Lower Carboniferous 

 Sandstones, Shales, and Limestones. But to the westward, in the 

 Commeragh Mountains, on these Ordovicians are, more or less, con- 

 glomeritic and argillaceous rocks ; and these possibly are the 

 representatives of the littoral accumulation of the Cork Devonian 

 or even Silurian ; this, however, has still to be proved. To the S.E. , 

 at the Bonmahon mines are a few patches of similar conglomerates, 

 which for the reason stated hereafter ( Wexford, p. 302) are supposed 

 to be Silurians. Devonian (or Silurian) seem also to occur further 

 south, in the long hill, or " drum," between the two Decies. 



1 Clay-iron-stone is recorded by Boate as having being worked in the Calp (?) shales, 

 in " Nether Tyrone, by the side of the rivulet Lishan." "Nether Tyrone" is the 

 .present Co. Londonderry. 



