Three Rocks Mountain : Rock Outcrop

Grid RefO 175 230
Longitude6° 14' 22.73" W
Latitude53° 14' 39.76" N
ITM east480366
ITM north584435
Nearest TownTallaght (9.5 Km)
OS Sheet50
UTM zone29U
UTM x449041
UTM y5761192
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Three Rocks Mountain Rock Outcrop ::

Rock 3. Strange granite shapes.

Photo Taken: Friday, 14th September 2001

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Saturday, 8th April 2006

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Friday, 14th September 2001

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Mr. G. V. Du Noyer said in a memoire (pub 1835 by the Geological Society of Ireland)
- "The remarkable-looking bosses of granite on the summits of the Three Rock and Two Rock Mountains are not perched blocks, but the solid granite weathering in places; and this weathering is solely the result of long-continued atmospheric action - rain, frost, and snow. The rock being evenly jointed in vertical as well as horizontal planes, has weathered on the line of separation; and some of the rough cubical masses thus formed have resisted the action of the weather more completely than the others. In this way are left those great table-like masses, having their edges moulded along the horizontal joints."

Then in 1780 Gabriel Beranger wrote

- "This mountain has on its summit three huge heaps of rock, piled one on another, and seen at some miles distance, from which the mountain takes its name. I take them to be altars on which sacrifices were offered. The plate [a sketch made by Beranger of the group of rocks visible from Dublin] represents one of the most entire; it rises about 18 feet above the ground, and is accessible by an easy ascent. It has several basins cut in the rock on its top, of the size of the inside of a man's hat; but one more remarkable than the rest, being of an oval form, and measures 2 feet 6 inches in length by 2 feet broad, the depth in the centre, 9 inches. Another of these, but less entire, is at some distance. I have copied every stone as they are fixed, and the regularity which is observed in piling them convinces me that they are the work of man, as they could not grow in that position. The sea is seen, though more than 6 miles off. The extensive summit of this mountain, the parched ground and its solitude, make it the most awful spot I had ever seen."

Sir William and Lady Wilde published the Memoirs of Beranger and on p.170 in an introductory reference to the foregoing account refer to the Three Rocks as "a Druid monument on the Three-rock Mountain", despite having access to the earlier scientific and correct assessment

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