Raheen : Bullaun Stone

CountyWicklow
Grid RefO 183 016
GPSO 18255 01638 (5m)
Longitude6° 14' 10.41" W
Latitude53° 3' 8.41" N
ITM east480366
ITM north584435
Nearest TownRoundwood (2 Km)
OS Sheet56
UTM zone29U
UTM x449041
UTM y5761192
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Visit Notes

Saturday, 9th February 2008

I'm not 100% sure about this triple bullaun stone. At least one of the bullauns is very elongated and that makes me think that at least this one was created in a river bed or perhaps at the base of a glacier. The other two are hemispherical and could be proper bullauns. Perhaps the stone was chosen because of the natural basin.

The 3.5m long stone is in a boggy field that is full of rough, jagged rocks and exposed bedrock. This makes it feel like an interloper, probably a glacial erratic. The three bullauns are grouped at one end of the stone around a natural fissure in the rock. One thing that speaks in favour of its authenticity is that it is so close to Derrylossary church, which has three bullaun stones around it.

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About Coordinates Displayed

This is an explanation of (and a bit of a disclaimer for) the coordinates I provide.

Where a GPS figure is given this is the master for all other coordinates. According to my Garmin these are quite accurate.

Where there is no GPS figure the 6 figure grid reference is master for the others. This may not be very accurate as it could have come from the OS maps and could have been read by eye. Consequently, all other cordinates are going to have inaccuracies.

The calculation of Longitude and Latitude uses an algorithm that is not 100% accurate. The long/lat figures are used as a basis for calculating the UTM & ITM coordinates. Consequently, UTM & ITM coordinates are slightly out.

UTM is a global coordinate system - Universal Transverse Mercator - that is at the core of the GPS system.

ITM is the new coordinate system - Irish Transverse Mercator - that is more accurate and more GPS friendly than the Irish Grid Reference system. This will be used on the next generation of Irish OS maps.

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