714 PROF. E. HULL ON THE DINGLE BEDS AND 
fossiliferous to place their age be- 
yond question, and rising into 
lofty and rugged elevations like 
those we have been consider- 
ing in Kerry. Amongst these is 
Mweelrea, the highest mountain 
in the west of Ireland, rising 2688 
feet from the level of the sea. 
So similar are the rocks of this dis- 
trict to the “Dingle” or ‘‘ Glen- 
gariff series,” that the general de- 
scription of one set would be ap- 
plicable to the other. 
The Upper Silurian rocks of West 
Galway and Mayo (fig. 9) consist of 
a great series of grits and conglo- 
merates, purple and green slates, 
with beds of conglomerate and 
limestone towards the base. They 
contain sheets of felstone porphyry 
and ash of contemporaneous origin, 
and are fossiliferous at intervals 
throughout. These beds, which 
are of great (but unknown) thick- 
ness, comprise the Upper Silurian 
series from the Llandovery stage 
upwards into the Wenlock and 
Ludlow stages; but, as observed 
by Sir R. I. Murchison, it is im- 
possible in the west of Ireland to 
separate the Upper Silurian series 
into those well-marked stages, cha- 
racterized by beds of limestone and 
special fossils, which he himself 
originally recognized in the Silu- 
rian region. The Upper Silurian 
beds rest everywhere discordantly 
upon a floor of more or less meta- 
morphosed Lower Silurian rocks, 
filling in old valleys and depres- 
sions, and often containing pebbles 
derived from the older formations. 
Mr. Kinahan separates the series 
into divisions, which are probably 
represented in Dingle and Kerry 
as under * ;:— 
* Expl. Mem. sheets 93, 94, &., p. 15 
(1878). 
(Seale 1 inch to 1 mile.) 
Leamaheltia, 
1717 feet 
x X Contemporaneous felstones and porphyries. 
Lough Muck. 
6,. Wenlock and Ludlow beds. 
6,. Upper Llandovery beds. 
mae 
mos 
as 
° 
Se 9 ae 
ee 
° 
“~ 
° 
Siasea 
Mweelrea, 2688 
feet 
Fig. 9.—Section across the Killaries, from near L. Cunnel to Kylemore (details omitted). 
Y 
Metamorphosed Lower Silurian beds. 
. Unaltered Lower Silurian beds. 
