GLENGARIFF GRITS AND SLATES. 703 
“ep yceape bade.” Greenish-grey fine-grained grits with bands of slate 
(Murchison ) resting on grey, brown, and purple slates and con- 
4 cretionary sandstones. 
( Grey, purple, and brown rough slates (cleavage and 
dip coincident). 
Purple and grey slates passinig down into brownish 
and greyish cleaved slates and calcareous grits with 
fossils, Atrypa reticularis, Pentamerus Knightii, 
Rh ynchoneila Sureata, Strophomena depressa, Or- 
thoceras annulatum, &c.* 
Fine-grained yellowish grits and sharp slates, with 
“ Croaghmarin beds.” | 
‘« Herriter’s Cove beds.” | grey shales and brown fossiliferous sandstones, 
{ 
| 
(Ludlow ?) 
(About 1000 fee ) 
(Dunquin Bay.) passing down into fine-grained purple grits and 
(Wenlock.) slates, weathering with cavities, with a base of 
purple brecciated bedst. 
Beds of purplish ash, lapilli, and agglomerate, some- 
times finely laminated and traversed by cleavage- 
planes ; with these are several beds of slate. 
“ Smerwick beds.” ae brown, green, and yellow sandstones and 
Voleanic 
Series. 
(Smerwick Harbour.) flags with bright red shales. No fossils, possibly 
2000 feet. of “ Llandovery” age. 
The above section exhibits not only a gradual passage from the 
unfossiliferous ‘‘ Dingle beds” into Upper Silurians, but an inter- 
calation of these beds themselves throughout a thickness of 1500 or 
2000 feet. The purple slates and grits shown in the section from 
Dungquin Inlet southwards, and lying well below the fossiliferous 
beds, are in no way different from the purple slates and grits which 
he above the highest fossiliferous band. So much is this the case 
that, for some time, these beds were classed by Mr. Du Noyer with 
‘‘the Dingle beds” until the discovery of the fossiliferous band 
above them, when the boundary was shifted further up. It is quite 
open, however, to any one to say that the one view is as correct as 
the other, and that the uppermost known fossiliferous band in the 
“« Croaghmarin beds” is to be included in the “ Dingle series.” 
Another section, showing the passage from ‘“ the Dingle beds” 
into the fossiliferous Silurians, is shown on the northern or western 
flanks of Mount Eagle, in a brook-course which descends towards 
Dunquin National School. The section is as follows (beds in de- 
scending order) :— 
1. Purple rough slates, with bands of greenish grit. Several 
hundred feet in thickness. 
Dingle and j . Thin-bedded light-brown sandstones. 5 feet. 
Passage-beds. . Evenly-bedded bluish-green and purple flagstones and 
2 
3 
tiles. 20 feet. 
E Yellowish fine-grained sandstones, micaceous, weathering 
yellow or brown. 26 feet. 
5. Beds not seen (probably shales). 
6. Calcareous grits, weathering brown, with Upper Silurian 
ds. fossils, 
Upper Silurian 
In this section, as in’ the larger one along the coast, there is no 
* Explanation to sheets 160, 161, 171 of the Geol. Survey Maps, p. 13. 
+ These beds, several hundred feet in thickness, have an exact resemblance 
to the purple slates of the “ Dingle beds,” from which they are separated by the 
fossiliferous “ Croaghmarin beds.” 
Pyle 
