Claggan : Portal Tomb

CountyMayo
Grid RefF 794 040
GPSF 79433 04030 (2m)
Longitude9° 50' 15.4" W
Latitude53° 58' 17.17" N
ITM east480366
ITM north584435
Nearest TownDoagh (18.9 Km)
OS Sheets30, 22
UTM zone29U
UTM x449041
UTM y5761192
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Visit Notes

Monday, 1st June 2009

This is one of those sad portal tombs where every stone is present, but not necessarily in the right place. Unfortunately the capstone has slipped from the top of the monument. I was told that it was in place around 60 years ago, but was not told how it came to be displaced.

The portal stones are about 1.6m tall, making this a very small example. The chamber is short and stubby too. It would have been quite cute. Unfortunately, the monument is next to a hedgerow that is slowly consuming it. brambles are creeping out and taking over. I don't think it will be visible for long. The rear stone of the chamber is pointed, giving it an affinity with some court tombs. There is a low doorstone in place between the two portal stones.

The easiest access to this monument is via the house marked to the south at the end of a curving track. To reach it from here you have to take a green road that gets very boggy and now has two fences across it. There is a rickety style over the first fence and a couple of large stones to help you over the second.

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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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