350 G. H. Kinahan — Dingle and Glengarijf Grits. 



matic section it is shown that near Dingle there is a thickness 

 represented by the strata A, B, C and D ; these rocks or the major 

 portion of them are also found in the country to the south, but in 

 addition to these are found the rocks E; and upon the latter the 

 "Old Red Sandstone " rests conformably. 



We have now to account for the fact that while the strata E were ac- 

 cumulating in the country south of Dingle Bay, no contemporaneous 

 beds were laid down in the western portion of the Dingle promontory. 

 From the records of the rocks it appears that for a time after the 

 Marine Silurians were deposited, there were successive accumulations 

 of matter, represented by the strata A, B, C and D, on the whole of 

 the area ; but after the strata D were deposited a great disturbance 

 took place north of the line of the valley of Dingle Bay, and the 

 rocks to the north of the bay, but especially to the westward, were 

 squeezed up, upturned, and brought under the influence of a 

 clenudant. But at the same time, while this was taking place in 

 the northern portion of the area, in the country to the south, rocks 

 were still being successively deposited, and the strata, represented by 

 E in the diagrammatic section, accumulated. How this could take 

 place has been fully described by Le Conte * and others, who have 

 made the sinking and upheaval of land their special study ; it is 

 therefore unnecessary for me to enter into it. 



But after the strata E in the south country were deposited, a 

 change took place in the north country, and the result of this change 

 was ; that instead of the rocks being denuded, — on them the " Old 

 Red Sandstone" was deposited; as well as on the rocks in the south 

 country ; while over it, in the whole area, were successive accumula- 

 tions up to the Coal-measures. In support of this hypothesis, the 

 sections published by Jukes show that the " Old Red Sandstone " in 

 the country to the southward is thicker than to the northward ; also 

 that on the Dingle beds and the accompanying Marine Silurian it is 

 of unequal thicknesses, while still farther northward it gradually 

 becomes thinner. 



At the commencement of the paper attention was directed to 

 Geikie's observations as to the Scotch rocks having marked litho- 

 logical differences. This can be also observed in Cork and Kerry ; 2 

 but at the same time in this area the rocks of one type nearly 

 invariably can be traced into the rocks of other types, while certain 

 peculiarities are more or less common to all ; and one of the more 

 marked peculiarities is the presence of metalliferous strata in the 

 upper portion of the " Old Red Sandstone." 



These metalliferous strata are best developed south of Bantry Bay, 

 but they can be traced eastward into Waterford and Kilkenny; and 

 to the north they are found south and north of Kenmare river, while 

 further north traces are found in the Tralee and Kerry Head districts, 

 and to the N.E. in the counties of Limerick, Tipperary, and Clare. In 



1 American Journal of Science and Art, ser. iii. vol. iv. pp. 345 et seq. 



2 To the northward, near the margin of the area of deposition, the rocks necessarily 

 are of a more littoral character than to the southward, for the reasons explained by 

 Prof. Geikie. 



