'Glendasan River (Glendalough i)' : Bullaun Stone

TownlandGlendasan River
Grid RefT 123 970
GPST 12336 96952 (7m)
Longitude6° 19' 33.94" W
Latitude53° 0' 41.46" N
ITM east480366
ITM north584435
Nearest TownLaragh (2 Km)
OS Sheet56
UTM zone29U
UTM x449041
UTM y5761192

This is a subsite of:

Glendalough - Visitor Centre
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Visit Notes

Sunday, 1st April 2007

This is special! Spread all around Ireland there are bullauns in streams or rivers and this is one of them. It took us a while to spot it as it is actually under the water.

Some people consider that stones such this are just natural formations caused by a round stone getting caught in a depression in the stone and being rolled around by the river, thus forming a circular hollow. If this is the case with this one then the stone that did it had an incredible sense of proportions, because the single bullaun is right in the centre of the stone.

The slab seems well imbedded into the river bed, so it's unlikely that it has been thrown into the stream. It measure about 1.5m long by 1m wide. The bullaun is quite small, perhaps a little under 20cm across, and looks quite deep relative to its diameter.

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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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