180 
STLUKIA. 
[Chap. VIII. 
I 
Knockaskeheen. 
Bundoragha 
794 ft. 
Killery Harbour 
Tievebreen 
Ben Gleniskv, 
1710 ft. 
Ballynahinch 
Lake. 
Derryadd West. 
Roundstone Bay. 
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described) nothing more than 
the altered lower members of 
the sedimentary deposits under 
consideration. 
In proceeding from Hound- 
stone Bay on the south, low 
isles and headlands of granite, *, 
followed by syenitic and horn- 
blendic rocks, f, throw off 
highly altered micaceous and 
quartzose schists, with courses 
of white and grey crystalline 
limestone, a, which, as you 
ascend the mountain of Ben 
Glenisky, one of the Twelve 
Bins of Connemara, are seen to 
be followed by strong masses 
of granular, white quartz-rock, 
b (manifestly an altered sand- 
stone), which alternate with 
mica-slate. 
Interlaced in the lower part 
of this series, and lying in de- 
pressions between Ben Glen- 
isky and Ben Bawn (2300 feet 
above the sea), and thence 
ranging to the west, are cer- 
tain crystalline limestones, one 
course of which is grey and 
white, and another is the beau- 
tiful green marble or ser- 
pentine of Connemara. They 
are overlain by the granular 
quartzites and mica-slates, b, 
which, occupying the greater 
portion of these mountains, are 
in some places surmounted on 
their northern face (with a 
slight unconformity % only) by 
J In a traverse of tbis tract, which I 
made from Clifden to Killery Bay, in the 
company of Professor Nieol, the green 
marble seemed to me to be enclosed in 
mica-schist and quartz-rocks. We also, 
however, met with a grey limestone, sub- 
