Silurian Rocks of the South of Ireland to those of North Devon. 139 
slates, with occasional beds of green and purple grit, enclosmg the Lower Carboni- 
ferous slates and Limestone ;—the Old Red Sandstone, Kiltorcan Beds, and the 
Coomhola Beds (either partially or altogether) being unrepresented. The accom- 
panying section (Fig. 1) shows the succession of the beds. 
Fig. 1.—Showing the relations of the Glengariff and Carboniferous Beds at Roughty 
Bridge, Kenmare. 
YY 
fe Y 
River TH iid, 
SY Yj ly Zc 
ff) V// Yi 
4000 fz Se 
L. §.—Carboniferous Limestone. ZL. C.—Carbs. Slates and Grits. G.—Glengariff Beds, consisting of purple sandy slate and 
greenish grits with quartz veins. <—Spaces where strata are not shown. 
The relations of these beds have been observed on the south bank of the Roughty 
River valley above the Bridge. 
(b.) At Kenmare, between the suspension bridge and the village, we find purple 
and green slates with strong greenish grits, characteristic of the Glengariff Beds, 
at a-distance of only 100 yards from the Carboniferous Limestone. ‘The space over 
which the strata are not exposed is probably occupied by Carboniferous Slate. 
(c.) At, and near, Sneem the relations of the beds are very similar to those above 
described. The section in the Tahilla River, above the Chapel, shows dark gray and 
blue slates, with Carboniferous fossils, succeeded by olive-coloured and greyish 
grits and slates of the Coomhola series in contact with beds of purple slate of the 
Glengariff series. There is an appearance of unconformity at the junction, where 
it is shown about 500 yards above the Chapel.* Higher up the stream are nearly 
continuous sections in hard purple or green grits, and purple slates. 
Amongst the hills in the direction of Sneem, the junction of the Lower Carboni- 
ferous Slate and Coomhola beds, with the purple slates of the Glengariff series, can 
be observed in numerous sections, and needs no further description. ‘The above will 
suffice to show the nature of the hiatus as it occurs in the Kenmare valley. 
GurneariEF Disrricr.—The relations of the beds in the district of Glengariff 
generally resemble those at Kenmare. The massive purple and green grits, inter- 
bedded with strong purple slates, which rise into the rugged hills and precipitous 
crags to the north of the harbour, are succeeded by olive green and grey grits and 
slates of the Coomhola series. Sections are shown in the Coomhola River and 
* A plan and section of this junction are given in the Quart. Journ. Geol. Soc., Vol. XXXV., p. 709, 
to which the reader is referred for more detailed information on the subject of the relations between the 
Glengariff and more recent formations. 
