580 Scientific Proceedings, Royal Dublin Society. 
remarkable mounds, between which the stream flows. Where’ 
these mounds abut upon the hills, they, ike the boulder-clay, are 
covered over to a certain extent with local wash from the slopes 
above. The gravels themselves are well stratified and waterworn, 
and consist, for the most part, of limestone, but also contain a 
considerable proportion of granite, slate and greenstone. No 
shell fragments have been found in them, but as they are known 
to occur in similar gravels at Annmount, about 400 yards further 
westward, this is owing most likely to the smallness of the ex- 
posures, which hardly reach below the weathered surface. When 
traced eastward up the Piperstown valley these gravels form a 
series of mounds, rising gradualiy on the slopes as we ascend the 
valley. They thin out in its head and on the moor to the south 
of Montpelier Hill into a mere sprinkling of pebbles on the 
rocky surface. Hven here, however, they rise occasionally 
into small mounds. ‘They extend thus in places nearly up to 
the 1250 feet contour, the upper limit appearing to be indicated 
here and there by a faint rise of the surface. <A strip of the moor 
from 50-100 yards wide lying alongside the deep transverse gully 
above described is quite devoid of gravel. This thin deposit 
extends completely over the ridge, and merges with those in the 
Killakee valley on the far side. 
A similar scanty deposit of gravel occurs on the top of Mont- 
pelier Hill, to the north of the gully. At one place it forms a 
mound of considerable size, in which a pit has been opened. 
At the eastern end of the pass, at the point where it opens into 
the wide depression mentioned above as occurring at this side of — 
the spur, are two mounds, or rather traces of mounds, lying one 
on each side of the gully, and composed, not of gravel, but of 
granitic and slaty debris, perhaps a portion of the material eroded 
from the pass. That on the north exists only as a mere swell on 
the otherwise even slope; that to the south is more noticeable. 
These appear to be in every way similar to a much larger deposit 
observed by Mr. Seymour in the pass of Glendoo, which, there is 
reason to suppose, has been deepened by the same agencies,’ and 
this has led me to believe that they are in some way connected 
with the formation of the pass. The material was probably 
L«¢The Glacial Origin of Glendoo,’? W. B. Wright, Irish Naturalist, vol. 1x., 
p. 96, 1902. 
