Antynanum : Court Tomb

Grid RefD 256 110
GPSD 25601 10959 (4m)
Longitude6° 2' 25.34" W
Latitude54° 55' 49.4" N
ITM east480366
ITM north584435
Nearest TownGlenarm (7 Km)
OS Sheet9
UTM zone29U
UTM x449041
UTM y5761192
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Visit Notes

Sunday, 10th February 2008

Welcome to Ireland's longest court tomb cairn! This site is huge and very complex. The cairn is a massive 70m long and runs east-west. At the west end there is a nicely preserved court that leads into a 7m long gallery . The gallery is full of cairn material, but you can see the top of the corbel stones that would have supported the now missing roofstones. At this end the cairn is over 3m tall. Along the north side of the cairn you can see a low stone wall, which may be part of the original revetment that held the cairn in place.

From the rear of the gallery the cairn tapers both in plan and height to a fine point. Roughly halfway along its length there is the finest subsidiary chamber I've seen to date. To all intents and purposes this subsidiary chamber is a portal tomb. It has a fine pair of entrance stones with a low doorstone set between them. The chamber behind them is made with 5 orthostats and the roofstones can be seen lying to either side of it.

A barrow is essentially a mound of earth over one or more burials. They are more usually to be dated to the Bronze Age. There are many forms of barrow including ring, bowl, long and bell barrows.

Ring barrows are formed by digging a circular trench or fosse around a central burial, with no mound.

Bowl barrows are formed by heaping up soil over the burial(s) from a surrounding fosse, these often have an external bank too (see Ballyremon Commons (County Wicklow)).

Bell barows are simply round mounds with no fosse or external bank.

Long barrows are rare in Ireland and are more common in southwest England. Their shape is basically ovoid rather than round (see Ballynoe (County Down))

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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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