166 Mr. Griffith, on the Order of Succession of the Older 



red quartz rock and red clay slate, the quartz rock predo- 

 minating; but no beds of true conglomerate have been ob- 

 served, though such may be discovered on a more careful ex- 

 amination. 



Ascending in the series, and approaching the limestone of 

 the valley of Kenniare, the red strata become more schistose 

 and chiefly consist of coarse red clay slate, vehich, approach- 

 ing the limestone, is observed to alternate with yellowish green 

 clay slate and red limestone in thin beds. These are suc- 

 ceeded by strata of gray quartzose sandstone containing cala^ 

 mites, the characteristic fossil of the yellow sandstone series, 

 the upper beds of which alternate with greenish gray and 

 dark gray clay slate, with occasional beds of gray limestone. 

 Still ascending, the limestone gradually predominates, till at 

 length the slate disappears, and the whole stratification is 

 composed of carboniferous limestone. 



To the south of the river Roughty, in a descending order, 

 a similar series to that above described appears at the sur- 

 face dipping to the north, so that we have again the dark 

 gray slate and limestone, the yellow sandstone with calamites, 

 the red limestone, the old red sandstone consisting of red 

 slate and red quartz rock, and in continuation the whole 

 suite of the schistose strata of the transition series already de- 

 scribed. 



Flaving described this section in detail, I again assert, that 

 the old red sandstone to the south of Castlemaine Bay has 

 been deposited conformably, on the underlying strata, and 

 that the apparent unconformability noticed by Mr. Hamil- 

 ton as occurring in the Gap of Dunloe, arises from a disloca- 

 tion of the strata occasioned by a fault, and not from original 

 dejwsition. 



Owing to the want of fossils throughout the entire succes- 

 sion of rocks above described, with the exception of the yel- 

 low sandstone and carboniferous limestone of the valley of 

 Kenmare, it is difficult to determine the position in geological 

 precedence which should be allotted to the green chloritic 

 quartz rock which forms the basis of the district under con- 

 sideration, or to determine at what precise point the old red 

 sandstone should be said to commence. It appears to me 

 that the only key which is likely to unravel this mystery, will 

 be found in the peninsula of Dingle, to the north of Castle- 

 maine Bay, where fossils have been discovered in the strata, 

 vi'hich have been recognised by Mr. James Sowerby as be- 

 longing to the upper Silurian rocks of Murchison. 



The fossils consist of 



