Kinahan — On Irish Arenaceous Rocks. 523 



the intervening Lower or Fenestella Limestone. It might be said 

 that, as the fauna creeps upwards in the littoral beds from the 

 Lower Carboniferous Sandstone and Shale to the Calp, it should 

 have crept up by similar means from the latter to the Coal-measures. 

 This, indeed, may possibly have happened, if John Kelly's classifi- 

 cation of the Slieve Beagh series of rocks (Counties Fermanagh, 

 Tyrone, and Monaghan), now favoured by Prof essor Hull, is correct, 

 ■as these rocks, according to Baily, from palseontological evidence, 

 ought to be classed with the Lower Carboniferous Sandstones and 

 Shale. At the same time, however, a very great change seems to 

 have taken place when the major portions of the Coal-measures 

 were accumulating, as they are not essentially littoral deposits, but 

 must, at least in part, represent land and fresh- water accumula- 

 tions. Griffith's term, "Yellow Sandstone," seems better, as a 

 general one, than "Lower Carboniferous Sandstone," as it does not 

 express on what horizon the rock accumulated, while it suggests 

 that the accumulations were marginal between the Carboniferous 

 and older rocks ; but the latter name seems now to be more gene- 

 rally preferred. 



In south-west Munster the Carboniferous rocks are different, 

 they being of the " Cork type" (Carboniferous Slate and Yellow 

 Sandstone). These consist, in a great measure, of slates and 

 shales, and they graduate downwards into the Devonian. The 

 arenaceous rocks in them are below the Yellow Sandstone, and 

 higher up, on different horizons, are the sandstones called by Jukes 

 Coomhoola grits. In a few isolated places the Carboniferous slate 

 graduates upwards into Coal-measures ; but in the latter the grits 

 and sandstones are of small or no account. Going eastward towards 

 Cork Harbour, the Carboniferous Slate becomes split up and inter- 

 stratified with limestone ; while further eastward it loses its indi- 

 viduality, being replaced by rocks more or less of the " Central 

 Ireland types." 



In the rest of Munster there are below, and also as littoral 

 accumulations, the Lower Carboniferous or Yelloiv Sandstone (Upper 

 or Carboniferous Old Eed), and still higher up the grits and 

 sandstones of the Coal-measures. The Calp here (more or less 

 argillaceous) is a middle division in the limestone, but having 

 in places arenaceous calcareous rocks, or, as at Castle Lambert, 

 €o. Galway, an impure coal seam. These, however, as sandstones, 



