I think this is a good example of cross-monument-folkloric-transfer (or something like that!) There is supposed to be a cup-marked stone in this graveyard, which could actually have been a bullaun stone . Or there was once a bullaun stone here that was known for its wart cures.
Now, tucked away in the back corner of the graveyard, the healing powers are attributed to the water that gathers in the empty socket of this cross base.
The cross base is stepped in profile and about 50cms tall.
The original purpose of bullan stones is not really known, but they have an undisputable association with water and Brigid worship. A 'bullaun' is a deep hemispherical cup hollowed out of a rock. Bullaun Stone refers to the rock itself, which can have many bullauns in it, although many are single.
It is generally thought that they date from the Bronze Age, but I personally believe there is a much old provenance to them and that there is a relationship to prehistoric rock art, for a good example of this see Glassamucky Mountain (County Dublin).
Ritual use of some bullaun stones has continued well into the Christian period and many are found in association with early churches (The Deer Stone (Glendalough D) (County Wicklow) is just one of many at Glendalough (County Wicklow)) and holy wells. Their presence at so many early Christian sites, to me, places them as being of massive importance to the pre-Christian inhabitants of Ireland and something the church was very eager to assimilate.
The beautiful example at St Brigit's Stone (County Cavan) still has its 'cure' or 'curse' stones. These would be used to by a visitor turning them whilst praying for (or cursing) someboby.
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.