This is the first fulacht fai that I have seen and I am slightly sceptical about it. It certainly bears all the form of one with thin slabs arranged in a rectangular shape in a shallow hollow.
Like much of the stuff on Newtown Hill this is not marked on the OS.
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To reach Newtown Hill the best plan is to park at Johnny Fox's pub in Glencullen and walk east towards Kiltiernan until you rach the new church. I crossed to the rear of the churchyard, scrambled over the wall and walked up the hill through the fields.
If you reach the barrow you've actually passed this feature. It is 20m down the fields in a direct line to the church below.
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.