The largest monument at Carrowmore, with a diameter of 34, meters is known as Listoghil and has a long and interesting history. Listoghil is the central or focal structure of Carrowmore—the other monuments are arranged
around it in a huge oval pattern like a huge wheel, and many of the smaller chambers are directed towards
it. It would appear that the Carrowmore monuments and the wider Cuil Iorra megalithic region constitute a formally designed neolithic landscape.
Listoghil was excavated between 1996 and 1998, and afterwards somewhat controversially restored by the Office of Public Works.
Listoghil differs from the other monuments in several respects. It has a long sequence of use and development, beginning with the massive platform or tertre, which is surely the oldest feature at Carrowmore. The stone circle, the largest within the site, and the large burial chamber would seem to be several hundred years younger than the platform. The chamber is the only monument at Carrowmore roofed with a limestone slab, the only monument bearing megalithic art, and the only chamber where the people who were buried there were not cremated.
The oldest constructed monument at Carrowmore is the platform or tertre at Listoghil. This feature was not obvious before the monument was excavated between 1996 and 1998. The platform seems to be composed of clay and rocks. It is 50 meters in diameter and 0.3 to 0.5 meters high. Burenhult found charcoal on the surface of the platform under a large boulder on the south side of the circle, and this sample yielded dates of about 4,100 BC, giving a possible construction date for the tertre.
The platform seems to be much older than the chamber and circle, and it seems likely that it was the focus of events and rituals which we will never know about. Burenhult recorded that a thick layer of sterile yellow soil was found under the chamber, and that there was an extensive area where fires had been lit in the middle of the platform, though these do not seem to have been used for cremation.
Early reports from both George Petrie and Charles Elcock mention an exterior stone circle around the outer edge of the platform. Petrie noticed five or six stones of this outer ring. However, today only one such stone can be seen on the west side of the monument. A large white gneiss boulder built into the field-wall beside Listoghil may be another stone from this outer circle. An outer circle would be fitting for the most important of the monuments at Carrowmore, and the stones may have served an astronomical function, marking out important rising positions of the sun and moon.
The Stone Circle
The circle at Listoghil is the largest found at Carrowmore with a diameter of 34 meters. There are 101 stones in the circle, almost all glacial gneiss boulders, and most are recumbent, which means they were found lying flat on the ground. The exceptions are four chunks of limestone, one of which is standing in a socket to the south of the circle. The largest boulder in the circle is found on the side facing Knocknarea, and seems to be an intentional marker pointing towards the mountain. This large boulder was one of the few stones visible prior to the Swedish excavations.
The large kerbstone facing the central chamber has been dubbed the 'footprint stone' because of the intrusion, a formation in the surface of the stone, which is shaped like a footprint. This stone was probably chosen to mark the entrance to the circle in the neolithic. It is speculated that in later times the stone played a part in inauguration and kingship rituals.
There were also a number of inner stone circles found at Listoghil, possibly as many as three. These features are commonly found in Irish passage graves. A number of the Carrowmore circles have them, and numerous examples are known from Knowth and quite a complex example was found at Townleyhall all in the Boyne valley. It would seem that these inner circles reflect divisions of time and space within the monuments, which seem to be designed as simulations or representations of the world of the dead.
The chamber at Listoghil is the largest of the series at Carrowmore. It seems that the circle and chamber were constructed at about the same time—around 3,600 BC, and that the chamber was free-standing within its circle like the smaller monuments. It seems likely that the chamber had some kind of small cairn to support and stabilize the structure.
The chamber is formed of seven stones: six to create the burial space and a huge slab of limestone to cover the entire structure. Three of the chamber stones are gneiss glacial erratics, the remaining three are of limestone. When the chamber was excavated in 1997, it was found that the chamber stones were sitting on the surface of the platform, not in sockets as might be expected. The only stone deeply buried is the large slab of limestone which forms the back-stone of the chamber. It is hard to imagine that the monument could have stood freely without a supporting cairn, and indeed packing stones were found around the chamber during excavations.
The large slab of limestone covering the chamber is believed to have been quarried in the Glen of Knocknarea some three kilometers west of Carrowmore. The fossils in the capstone match those found in the limestone at the Glen. This great rock measures 3 x 3 meters and is 30 to 40 cm thick. It weighs an estimated 10 tonnes and would have been transported to Carrowmore using log rollers and ropes.
The slab is carefully positioned and is elevated six degrees above horizontal. To achieve this sloped roof, small chock stones or spalls of sandstone were inserted. These blocks of sandstone are thought to have been quarried in Scardan to the north of Carrowmore. Similar use of sandstone supports at load-bearing points are found in Cairn F at Carrowkeel.
Evidence of a possible passage leading to the chamber was discovered in 1997—three large boulders were found at the entrance to the chamber. Burenhult interpreted them as the remains of another megalithic structure, but it seems much more likely that they are the remnants of a funnel-shaped passage. No sockets were found during the excavation.
Burials in Listoghil
The monuments in Carrowmore have a poor record of surviving human remains, mainly because of the treasure-hunting activities of Roger Walker, the local landlord who cleared out many of the chambers between 1830 and 1850. We know from records that Walker cleared out the chamber of Listoghil some time in 1840. As usual, having no interest in human remains, he threw them out of the chamber and they were discovered by both Wood-Martin and Burenhult scattered around the front of the chamber.
It seems that a minimum of seven individuals were buried within the chamber, which had a flagged stone floor. In all the other monuments at Carrowmore, the burials consisted of cremated bone, and it is estimated that 40 to 50 people may have been interred in each chamber. The people who were buried in the chamber of Listoghil received different treatment: their skeletons were disarticulated, or dismantled into component parts, and a sharp implement, possibly a flint or chert knife was used to deflesh the bones.
The chamber is dated to about 3,550 BC, the date coming from the skull of an elderly man buried within the chamber: he was about 54 years of age, extremely old for a neolithic farmer. Another of the individuals within the chamber was a 23 year old man. There were two children aged approximately nine and seven years old. The remains of the other three bodies were too fragmentary to reconstruct either their age or sex.