This standing stone is not marked on the os map, perhaps because it is right next to the barrow.
The stone is, maybe, 1.4m tall and roughly square in section with a side of roughly 40cm.
It seems to be aligned with the summer solstice sunrise when viewed from the barrow.
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.
The standing stone is just to the east of the barrow, which is on the crest of the hill behind a hedge as you approach this way.
The barrow and stone are accepted but some of the other stuff not.
"A History of the County Dublin"
(The people, parishes and antiquities from the earliest times to the close of the eighteenth century)
By Francis Elrington Ball.
"... and on Newtown Mountain a cromlech, a pillar stone, a tumulus with a fosse and several stone circles and lines of stones, ..."
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.