Cloghroe : Portal Tomb

CountyDonegal
Grid RefC 134 007
GPSC 13447 00693 (5m)
Longitude7° 47' 26.2" W
Latitude54° 51' 13.59" N
ITM east480366
ITM north584435
Nearest TownStranorlar (5.6 Km)
OS Sheet6
UTM zone29U
UTM x449041
UTM y5761192
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Visit Notes

Saturday, 27th October 2007

This tomb is next to the road on a small, raised prominence that overlooks a shallow valley to the south. There is possibly some of the original cairn material under the grass on the north side of the tomb, but this could be a build-up of soil that has washed down the slope and built up against the remaining stones.

The remains consist of two three metre tall portal stones and three orthostats from the chamber. The entrance faces west, up the valley. The northern portal stone has slipped and now leans against the other. If this is left in this state it could lead to both stones falling. The northern portal stone has an interesting feature - The back edge has been trimmed so that the lower part of it is veritcal.

The three remaining orthostats from the gallery are the backstone and two stones from the northern wall of the chamber. There is a gap between the wall stones and the portal stone, which implies that there were probably three stones in each wall. This is a very unusual form. The backstone is pointed, like those often found in court tombs. If any monument was to demonstrate the link between portal tombs and court tombs, then this is it. It's just a shame that it is so ruined.

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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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