358 Mr Weaver on the Geological Relations of 



considerable collieries, those of Dromagh, have yielded ^5,000 

 tons per annum, at from 10s. to 15s. per ton. 



The coal, and accompanying pyritiferous strata, are abundantly 

 charged with the remains or impressions of plants belonging chief- 

 ly to Equiseta and Calamities, with some indications of Fucoides. 

 Beds of transition coal occur also in the county of Limerick, on 

 the left bank of the Shannon, not of Abbey feall, and at Long- 

 hill ; and are seen, though in very small quantity, on the right 

 bank of the river at Labasheada. Several other places where 

 coal strata occur are mentioned by the author. The transition 

 rocks of Kerry and Limerick are prolonged into Cork and Water- 

 ford, preserving with certain modifications an analogous charac- 

 ter and composition. The carboniferous limestone reposing 

 upon this tract, on the north, is usually unconformable to it, but 

 is conformable to the old red sandstone, wherever that rock in- 

 tervenes. In this system of strata, organic rernains, such as po- 

 lyparia, bivalves, trilobites, &c., occur near the Bonmahon 

 river ; the horizontal planes which they occupy crossing the ver- 

 tical cleavage of the slaty grauwacke nearly at right angles. 

 The series rests upon and passes into clay-slate, and is capped 

 by old red sandstone and strata of the carboniferous order. Me- 

 talliferous veins, with indications of copper and lead, are seen in 

 the cliffs of the transition series, east and west of the Bonmahon 

 river. 



2. Metalliferous Relations ()f Kerry and Cork. 

 The author having succeeded in restoring the copper-mines at 

 Ross Island, on the Lake of Killarney, and in effectually drain- 

 ing off the water, was enabled to prove that the ore did not con- 

 stitute a metalliferous bed, or any real vein, but was contempo- 

 raneous with the rock, in which it is irregularly distributed in 

 the form of ribs, branches, strings, &c., analogous to those of 

 calcareous spar in limestone. The rocks at Boss Island consist 

 of blue limestone, and beneath it of siliceouslimestone, but the 

 ore is confined exclusively to the former ; and various trials have 

 proved the non-existence of any vein communicating with the 

 metalliferous deposit. Copper-ore is similarly distributed at 

 Crow Island ; but at the Muckruss mines the ore was obtained 

 chiefly from a metalliferous bed. The author has ascertained 



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