. Manual of the geology of Ireland. thickness, and fully developed only hereand there, is proved; as, near Nobber, the Coal Measures lieon limestones, while to the N W. they appear to rest directlyon the Cambro-Silurian rocks. West of Ardagh, the lime-stones contain a group of fossils which in Munster wouldbe regarded as presenting a Lower Limestone fades;and yet a little NW. of the same place are shales, which,as appears by their contained fossils, clearly belong tothe Lower Coal Measures. Here, therefore, there seemsto be the same confusion as in the rocks to the south, inthe County Dublin ;
. Manual of the geology of Ireland. thickness, and fully developed only hereand there, is proved; as, near Nobber, the Coal Measures lieon limestones, while to the N W. they appear to rest directlyon the Cambro-Silurian rocks. West of Ardagh, the lime-stones contain a group of fossils which in Munster wouldbe regarded as presenting a Lower Limestone fades;and yet a little NW. of the same place are shales, which,as appears by their contained fossils, clearly belong tothe Lower Coal Measures. Here, therefore, there seemsto be the same confusion as in the rocks to the south, inthe County Dublin ; colonies of fossils characteristic oflower parts of the Carboniferous Limestone in Munster,occurring here high up in that formation. In places atthe margin of the underlying Cambro-Silurian rocks, arelocal patches of bright-coloured sandstones and small outlying patches of Carboniferous rocks occurto the SW., a little westward of Kells, and towards theNW., at Stradone, on the east of Cavan. Plate IV.] [To face page W. H. Baily, del. Upper Carboniferous (Coal Measures) Fossils. 95 CHAPTER VI. Upper Carboniferous. Coal Measures. In Chapters IV. and V. it was shown that the rocks of theLower Carboniferous group are variable in character. Inthe SW. of Ireland, particularly in the SW. of the CountyCork, there are no limestones in the group ; in northMunster, and part of Leinster, there is the greatest thick-ness of limestone strata ; while, in Ulster, there arearenaceous and argillaceous rocks, but of different typesfrom those in south-west-Cork, which in a great measurereplace the limestones. (The rocks called Coal Measures inIreland, lie directly on all these different types of apparently on one and the same geological horizon^These Coal Measure rocks, however, in some places over-lap the Lower Carboniferous rocks, so as to lie immediatelyand, of course, unconformably on the Lower Palaeozoic andother older rocksj It was also shown that the coal-bearingr
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