Tinnacarrig : Bullaun Stone

Grid RefS 758 469
GPSS 75785 46920 (5m)
Longitude6° 52' 55.84" W
Latitude52° 34' 6.2" N
ITM east480366
ITM north584435
Nearest TownBorris (4.8 Km)
OS Sheet68
UTM zone29U
UTM x449041
UTM y5761192

This is a subsite of:

Tinnacarrig - Rock Art
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Visit Notes

Saturday, 9th February 2008

There are actually two bullaun stones lying next to the rock art panel. It took us some time to find these due to the bramble cover. In fact, we initially only found one of them and the had to go back to look for the larger one after the farmer told us there were more.

The smaller stone has been cut from a larger block of stone in such a way as to lose the bottom of its basin: it is now pierced through.

The larger example is a lovely organic-looking blob of stone with a large single bullaun about 40cm across.

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A Selection of Other Bullaun Stones

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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