Piperstown : Cairn

CountyDublin
Grid RefO 108 220
GPSO 10753 21950 (7m)
Longitude6° 20' 27.77" W
Latitude53° 14' 11.03" N
ITM east480366
ITM north584435
Nearest TownTallaght (5.6 Km)
OS Sheet50
UTM zone29U
UTM x449041
UTM y5761192
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Visit Notes

Saturday, 27th May 2006

There are three cairns shown on the OS map at Piperstown. This is the best preserved one. It is also the only one to be excavated - labelled Site K on the excavation plan. The main excavation area lies to the east of the cairns and is dotted with hut circles.

The excavation revealed several standing stones beneath the cairn itself, which was interpreted as a stone circle. Looking at it now I think this is flawed. The diagram in the report clearly misses out several other stones that are set just outside the carin. The uncovered stones are just a very loose kerb .

The cairn is just 1m high and 2m in diameter.

A kerb is a ring of stones placed around the perimeter of a burial mound or cairn. It basically serves the purpose of a retaining wall to keep the cairn or earth in place. Kerbs are usually associated with passage tombs, but do occur on court tombs and wedge tombs too.

Sometimes on passage tombs the stones can bear decoration, such as at Newgrange (County Meath).

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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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