Keerin : Portal Tomb

CountyTyrone
Grid RefH 643 865
Longitude7° 0' 7.15" W
Latitude54° 43' 20.42" N
ITM east480366
ITM north584435
Nearest TownMoneymore (21.7 Km)
OS Sheet13
UTM zone29U
UTM x449041
UTM y5761192
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Visit Notes

Monday, 4th August 2003

After seeing the state of the nearby court tomb ( Keerin (County Tyrone)) I was not hopeful about this one. I was even less hopeful as I parked close to where the tomb was alledged to be, but I got out and looked around the field (well the bog). Still nothing. So, I stood on the gate and saw a stone. A stone lying on the ground. Oh dear!

Still, each one needs investigating and so off I set. What a wonderful surprise awaited! Sometimes it's good to be optimistic.

The stone I had seen was indeed the capstone of the tomb, but it was not level with the ground due to collapse, but because it is embedded into the peat.

This really must be the tiniest portal tomb around. The capstone is just 90cm wide and 1 little over 1.5m long. It is set on top of top tiny pointed portal stones and a mini chamber. Due to being in a peat bog the chamber, which has been dug out is filled with water. Due to this water I can't say if there is a doorstone or not.

This is one very cute tomb and worth stopping by if you're in the area.

Court tombs have several distinctive characteristics that allow easy identification when in fair condition. One key feature that is a great help, no matter what the condition, is that court tombs are nearly always aligned north to south. They were all originally covered by a cairn, but in most instances this is now missing, or at best only remain to a height of one or two metres. The easiest feature to identify (when intact) is obviously the court. The rest of the tomb is occupied by a long, divided, passage-like gallery.

Galleries:
Galleries of court tombs can usually be identified by their characteristic boat-shaped plan, i.e. the gallery, when viewed from above, is flat at the entrance and tapers to a point or narrow width at the rear. The gallery may be segmented into up to five chambers by jambs, the walls normally being made of large slabs. The roofs were created by laying large slabs across the gallery, either directly on to the tops of the wall slabs or resting on corbel stones. Two large stones, with smooth forward-facing faces, usually create the entrance and it is possible to identify a court tomb when only these stones remain. The gallery would have been covered by a cairn of stones, sometimes with a kerb.

Single Gallery Variations:
Most often called a 'Single Court Tombs, usually this style has a half-court, a horseshoe-shaped arrangement of stones in front of the gallery (see Ballymacdermot (County Armagh)). This is usually, but not always, symmetrical about the centre line of the gallery, although occasionally the centre line of the court forms a slight angle with the centre line of the gallery. The other option is a full-court formed a complete circle of stones (see Creevykeel (County Sligo)). These full-courts mainly have one entrance allowing access, which is usually opposite the entrance to the gallery.

Double Gallery Variations:
Double-gallery court tombs come in three styles, the last of which is very unusual. The first is where the chambers are built facing away from each other. These are usually referred to as �Double Court Tombs� (see Cohaw (County Cavan)). The galleries sometimes share the same rear stone, but more often there is some distance between them � ranging from one to ten metres. This style has a half-court at each end of the monument, one facing north and the other facing south. In this style both galleries would have been covered by the same cairn.

Tuning round the two tombs and placing the two galleries so that the entrances face each other, across a full court, creates another style, known as a Centre-Court Tomb. Access to this court is gained through entrances placed (usually) in the east and west sides of the court. Here there would have been two cairns, one at each end, but they would have been joined down the sides of the court by a low cairn.

The third and very uncommon form is where the two galleries are located side-by-side facing into a full court with an entrance opposite (e.g. Malin More).


Subsidiary Chambers:
Quite often you will find other chambers built into the cairn. In single-gallery tombs and double court tombs these are invariably located to the rear of the gallery. Centre court tombs often have them placed near to the entrances.

Portal tombs are what most people wrongly refer to as dolmens. They are, to me at least, the most strikingly designed of the megalithic tombs. They are called portal tombs because they have two large upright stones, usually very well matched, in front of the chamber that seem to form a doorway.

Resting upon the portal stones and the chamber a large capstone rests (sometimes there are two capstones - see Knockeen (County Waterford)), usually at an angle of around 22 degrees from the horizontal. Although these were originally incorporated into one end of a long cairn there are none left in this state today, although traces of the cairn can sometimes be seen upon the ground. The portal stones can be up to 3.5m tall, which combined with a thick capstone can produce an imposing monument over 5m tall. Capstones can reach in excess of 70 tonnes, with that of Browne's Hill (County Carlow) being estimated at over 120 tonnes.


Often betwen the portal stones there is a door slab, blocking the width of the entrance, but not always the full height. Door slabs are either half height, three quarter height or full height, describing the amount of the portal that they obstruct. All portal tombs would have had door slab, but this has often been removed to facilitate entry into the chamber.

Quite rarely the portal stones are the same height as the chamber and the characteristic slope of the capstone is created by the profile of the capstone (see Glendruid (County Dublin)).

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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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