So, I'm passing through Monaghan on my way to Tyrone and I decide to stop off at all three of the portal tombs in the county. Stop one is this sad site.
It is trashed. It lies at one end of a copse, across one field. I got soaked, because the field with the tomb in had some very long, very wet grass growing there.
It now consists of just the rounded split boulder capstone and one portal or chamber stone, but it's very overgrown, so its hard to say.
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The Magalithic Tomb Survey and one older OS map I have call this townland 'Corlkeanamaddy'. The newer OS maps omit the K, as does the Monaghan Archaeological Inventory.
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.