282 
Mr. Weaver on the 
the value of fuel and the damage of land become likewise important 
considerations in such undertakings. To these causes it is princi- 
pally to be ascribed, that whatever mining operations have been 
carried on in this field, have been very superficial, seldom attaining 
to a greater depth below the surface than ten or twenty fathoms. 
In this manner, nevertheless, excellent galena has been raised at 
different periods near the strand at Clontarf ; so also near Dolphins- 
barn, Kilmainham, Castleknock, and Cloghran in the county of 
Dublin ; and at Floodhall in the county of Kilkenny. And in the 
northern part of Meath, hear Beaupark, adjacent to the Boyne, cop- 
per ore was formerly raised. 
3, Coal Formation ; 
§ 182. As it does not enter into my plan to consider the ex- 
tensive coal tract in Munster, which rests upon and borders our 
limestone field on the south-western side j I shall confine myself to 
the Leinster coal tract, and more particularly to the Killenaule 
coal district, of which no distinct account has yet appeared before 
the public. A valuable Report has been already published upon 
that of Castlecomer, by Mr. Richard Griffith, junior,* to which it 
is sufficient for me to refer. But in order to connect that district 
with the country extending eastward to the sea, and also to afford 
grounds of comparison with the Killenaule coal tract, I have with Mr. 
Griffith’s permission drawn his section of the former district, upon 
the same scale as my own sections ; (see Plate 14. No. 1. 2. 3. and 4.) 
The third and smallest district of coal beds which lies to the north- 
* Geological and Mining Report of the Leinster Coal Districts 
