Knockergrana : Court Tomb

Grid RefC 551 470
GPSC 55083 46982 (5m)
Longitude7° 8' 0.22" W
Latitude55° 16' 0.19" N
ITM east480366
ITM north584435
Nearest TownCuldaff (3 Km)
OS Sheet3
UTM zone29U
UTM x449041
UTM y5761192
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Visit Notes

Saturday, 27th October 2007

This is a nice monument, despite being a bit on the ruined side. There is no court, but the gallery is in fairly good condition. The remains of the cairn/mound is about 30 long. The northern side of this has been robbed away and some of the orthostats have been removed from this side, too.

The gallery is divided into three chambers. The divisions are created in two different ways: one is with two jambs and the other with a septal slab. Each of the chambers is about 3m long. At the west end, a displaced roofslab lies in the first chamber.

A trackway runs across the west end of the monument, presumably through where the court once stood. The Donegal Inventory states that the court was probably at the east end, but this must be a typo. The gallery narrows towards the east end and, if the entrance was at the east, the first chamber would be blocked by the septal slab that blocks the width of the gallery.

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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