Tinnacarrig : Rock Art

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

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Tinnacarrig - Bullaun Stone
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Visit Notes

Saturday, 9th February 2008

This slab of rock is prone to being covered by the rampaging brambles that now own the own churchyard that it lies in. It measures about 80cm x 40cm. Both surfaces are carved and it used to stand up at one time - presumably used as a grave marker.

The underside has a few worn cup-marks and some straight lines, the latter possibly being plough marks create while it was still buried in a nearby field. The upper side is much more ornate with many worn cup-and-ring motifs. When lit from the side the two central ones still stand out well. One of these has two rings and a gutter.

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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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