252 
THE GEOLOGIST. 
It is somewhat remarkable, that over this district many rocky emi- 
nences and ridges, which do not attain to an elevation of much more 
than lOGO feet, are quite free from the Drift, which in some localities 
reaches a heiglit of 2000 feet and over it. Such, for example, is the 
case at the Hill of Carrignaspirroge, to the west of Macroom, and to 
the north of the head of the Bardinch Hiver. "Without doubt this 
deposit once covered all the hills of this range, up to their very 
highest summits ; but some local currents must have subsequently 
removed it while the district was being slowly raised above the level 
of the sea. 
In the northern portion of the county of Tipperary there are some 
fine examples of glacial action and perched boulders. 
Mr. "Wynne, of the Geological Survey of Ireland, in his explana- 
tion to sheet 135 of the Geological Map, affords us some very valuable 
information on this point. 
He remarks that Limestone Drift was recognized at considerable 
elevations on the northern slopes of the liills about Killanafinch. 
Large blocks of granite occur south of Toomeyvara, which have been 
transported from the county Gal way. 
Along the high ground which rises south of Moneygall large 
boulders of limestone are scattered over the hills, especially about 
Eusherstown, Mhere they attain to a height of 500 feet above the 
sea. On the top of Loyer Hill, south of Moneygall, at a height of 
about 890 feet above the sea, a large block of limestone occupies a 
very conspicuous position ; it measures 12 feet X 9 x 7^, and it rests 
on Lower Silurian rocks. 
On the summit of the well-known mountain called the Devil's Bit, 
near Templemore, and at a height of 1583 feet above the sea, Mr. 
Wynne discovered glacial striae and erratic blocks of Silurian grit 
on the surface of the Old Eed Sandstone ; the direction of the striae 
is from N.N.AV. to S.S.E. 
The occurrence of glacial strise at this great elevation affords fur- 
ther evidence of the enormous lapse of time during which the South 
of Ireland lay submerged beneath the glacial sea during the last 
Pleistocene period ; such scratches and groovings on rock surfaces 
were produced beneath comparatively shallow water, and the total 
amount of elevation of the land during this glacial period is thus de- 
fined with tolerable certainty. 
The facts just detailed may be regarded as the most important and 
obvious of those relating to the evidence of glacial action over the 
South of Ireland. 
