bullauns

Tormain Hill (3), Ratho, Midlothian

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Cup-Marked Stone: OS Grid Reference – NT 12906 69669

Also Known as:

Bonnington Mains
Tormain Bullaun
Tormain ‘C’ (Allen 1882)

Getting Here

Follow the same directions to get to the Tormain (1) carving, but take a few steps backwards from it and it’s on a small flat earthfast stone to your right (west). You’ll see it.

Archaeology & History

Just a stride or so away (north) from the dubious Tormain (2) cup-marking we find a much more likely prehistoric contender in front of us. It’s notably different from the others on the hill in that it possesses a very large wide and deep ‘cup mark’ which, if it was found in Ireland, would undoubtedly be classed as a bullaun stone. That was the first thing I exclaimed to myself when I clapped eyes on it! A bullaun can be a man-made or natural hollow or basin cut into outcropping rock, boulders or small portable stones and used for various pragmatic and ritual purposes – many with traditions and folklore attached. Sadly, no such folklore is remembered here.

There are four other smaller standard sized cup-marks, at various distances from the primary bullaun, one of which may be Nature’s handiwork. They were illustrated by the great Romilly Allen (1882) when he first wrote about the carving. One of the cups may have a faint carved line running from it, but this would require the attention of the computer imagery dudes to confirm or deny this. It wasn’t seen by Allen, who simply said of it:

“The carvings on it consist of a bowl-shaped depression, 6 inches in diameter and 2 inches deep, and four cups near it varying in diameter from 1 to 1½ inches.”

The fact that bullauns possess a number of practical uses implies the large ‘bowl’ may have been used in a pragmatic sense for something, with the proximity of the impressive Tormain (1) carving just yards away almost appealing for ceremonial association of one form or another. We find similar bullaun/petroglyph associations at a number of other recognized rock art sites: the Mixing Stone in North Yorkshire being just one example. Large bowl-shaped hollows have been used in some cultures like mortar and pestles to macerate herbs, used in medicines and paints, both of which may have been applicable here.

References:

Allen, J. Romilly, “Notes on some Undescribed Stones with Cup Markings in Scotland,” in Proceedings of the Society of Antiquaries Scotland, volume 16, 1882.

Tormain Hill (1), Ratho, Midlothian

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Cup-and-Ring Stone: OS Grid Reference – NT 12910 69668

Also Known as:

Tormain ‘A’ (Allen 1882)

Getting Here

Best approached from Ratho village, head up Main Street towards Bonnington Mains. Shortly after the last road in the village (Halicroft Park, on the right) a small line of trees appears on the left and about 250 yards on a footpath takes you therein. Follow this for 250 yards (it runs parallel to the road) and the path then slopes uphill alongside the field. Go all the way to the top (roughly 500 yards) where the small copse of trees crowns the summit. On the ground there are a number of both small and medium-sized flat earthfast stones. You need to walk to the one at the end, just where the hill begins to slope back down. You’ll find it!

Archaeology & History

Tormain Hill, or the hill of stones (Harris 1996), has an interesting cluster of petroglyphs on its top, with this one in particular being the most impressive. It’s the southernmost stone in what’s been designated as a cluster of eight carvings—although we need to be slightly sceptical of one or two of them. Not this one though!

Regarded by Ron Morris (1981) as being “one of the best cup-and-ring designs in Scotland”, it was first mentioned by John Smith (1874) who visited the site with the local farmer James Melvin, who’d discovered the carving some years earlier. Initially he only noticed cup-markings, but when he visited the place with the pioneering rock art researcher Sir James Simpson, upon “removing the shallow soil or turf from the rock on the summit of Tormain Hill” this impressive multiple-ringed design came to light: “one cup (and) four concentric circles .”

A few years later another rock art pioneer, J. Romilly Allen (1882) visited Tormain and found quite a bit more upon this hill. This particular carving, he told,

Allen’s 1882 sketch

Tormain ‘A’ site (Allen 1882)

“is much the finest and most remarkable in every way. It is the most southerly of the whole group, and is a piece of natural rock projecting from the side of the hill about 9 inches above the turf, and measures 4 feet 3 inches long by 2 feet 3 inches wide. Its upper surface is flat, of oval shape, and slopes slightly towards the hill. It is intersected by two parallel cracks of natural formation. The sculptures consist of twenty cups varying in diameter from three quarters of an inch to 2 inches in diameter. Seven of the cups are surrounded by a single ring, and one by four concentric circles. These latter are not complete, but form loops round terminal cups. Three of the cups with single rings are arranged in the form of a triangle. In addition to the cups and rings are two long grooves, one cutting off the corner of the stone, and the other parallel to one of the natural cracks.”

More then forty years later the Royal Commission (1929) dudes visited the Tormain stones. It had become so overgrown by then that only two of the eight carved stones were visible: “but a search beneath the turf revealed the other sculpturings,” they told. It would seem that they chose a bit of a grey day when they came here as they told how the carving appeared “so much worn that the concentric rings are, in particular, difficult to follow.” So they did a rubbing of the stone—a common practice of rock art students over the last century or two. In doing so they were able to discern the following:

“The boulder is fractured in two places by natural agencies, but it shows traces of twenty cup-marks, varying from little more than half-an-inch to fully two inches in diameter, and there are two separate gutters. Seven at least of the cups are surrounded by single rings, and in two instances the rings are connected by shallow gutters to simple cup-marks. The largest cup-mark on the stone is encircled by one complete ring with three additional concentric arcs linking up four of the other rings. Another group consists of three cups, each surrounded by a ring, which are closely set in the form of a triangle, with three other smaller cup-marks in close proximity.”

Impressive stuff! In more recent times the site has gained the attention of fellow rock art explorers like Kaledon Naddair, Stan Beckensall and others—but we’re still none the wiser what it means!

Its position in the landscape was probably an important element. Pinus sylvestris (the ley-hunter’s favourite tree) grows spaciously, as it is wont, atop of the hill and, in bygone centuries, would have been much more prevalent before farming enveloped the land hereabouts. It was likely clear of trees on top of Tormain when the stone was carved, giving uninterrupted 360° views of the hills, high and low, as far as the eye can see. The legendary prehistoric Cairnpapple Hill stood out due west from the carving and other notable hilltops in the Pentlands would have had mythic relevance. Sadly, all oral tradition has long long faded and so whatever narratives that were told here have long ago been lost. It strikes me as a tribal gathering place: a moot hill perhaps. The bullaun stone adjacent to this fine carving would be a receptacle for paints, herbs, elixirs to be macerated and used by the people….

Check it out. Have a feel of the place. But spend a few hours here and listen to the wind…

References:

Allen, J. Romilly, “Notes on some Undescribed Stones with Cup Markings in Scotland,” in Proceedings of the Society of Antiquaries Scotland, volume 16, 1882.
Beckensall, Stan, Rock Carvings of Northern Britain, Shire: Princess Risborough 1986.
Beckensall, Stan, British Prehistoric Rock Art, Tempus: Stroud 1999.
Feachem, Richard, Guide to Prehistoric Scotland, Batsford 1977.
Hadingham Evan, Ancient Carvings in Britain: A Mystery, Garnstone: London 1974.
Harris, Stuart, The Place-Names of Edinburgh: Their Origins and History, Gordon Wright: Edinburgh 1996.
MacLean, Adam, The Standing Stones of the Lothians, Megalithic Research Publications: Edinburgh 1977.
Morris, Ronald W.B., “The Cup-and-Ring and Similar Early Sculptures of Scotland; Part 2 – The Rest of Scotland except Kintyre,” in Transactions of the Ancient Monuments Society, volume 16, 1969.
Morris, Ronald W.B., “The Cup-and-Ring Marks and Similar Sculptures of Scotland: A Survey of the Southern Counties – part 2,” in Proceedings of the Society of Antiquaries, Scotland, volume 100, 1969.
Morris, Ronald W.B., The Prehistoric Rock Art of Southern Scotland, BAR: Oxford 1981.
Royal Commission Ancient & Historical Monuments of Scotland, Inventory of Monuments and Constructions in the Counties of Midlothian and West Lothian, HMSO: Edinburgh 1929.
Smith, John Alexander, “Notes of Rock Sculpturings of Cups and Concentric Rings, and ‘The Witch’s Stone’ on Tormain Hill; also of some Early Remains on the Kaimes Hill, near Ratho, Edinburghshire,” in Proceedings of the Society of Antiquaries Scotland, volume 10, 1874.

Mixing Stone, Low Snowden, Askwith, North Yorkshire

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Cup-and-Bowl Stone: OS Grid Reference – SE 18074 51241

Getting Here

Follow the directions to reach the Ancestors’ Stone and the Sunrise Stone; and there, roughly halfway between them, right by the edge of the old collapsed walling, you’ll see this rise of a stone with a large ‘bowl’ on top. That’s it!

Archaeology & History

Laid upon the same geological ridge as our Ancestors’ and Sunrise carvings, there are one, possibly two faint cup-marks visible on the low flat surface near the edge of this rock, barely visible unless the light’s right. But the important element here, perhaps regardless of the cup-marks, is the ‘bowl’ or rock basin on top of the stone. Internally, it’s smoothed equally on all sides and, due to being in-between the two impressive petroglyphs, may well have had a practical function to it. Bear with me on this one…

Stone ‘bowls’ or cavities—natural and otherwise—have been made use of in many cultures for simple functional purposes, such as grinding flour, herbal mixes, etc. We find such traditions in some of the bullauns of Ireland and Scotland; whereas in similar stone bowls known as cat troughs in nearby Haworth, milk was poured to appease the spirits of the land (this tradition was still being maintained in 2001!). Folklore and traditions of such rock basins spread far and wide beyond the UK: one of the German terms for rock basins is Opferkessel, meaning ‘sacrificial basin’ and suggests ritualistic usage by early societies. Elsewhere on Earth there are numerous accounts of the ritual use of petroglyphs in which indigenous peoples tell of their use of plant- or rock-based paints (in many cases red ochre) to decorate the carvings. And it’s this element that I’m interested in here.

The Sunrise and Ancestors’ Stones 10-15 yards either side of this Mixing Stone are ideal candidates for such petroglyphic paintings using early ochre and other stone or plant-based agents. Such activities would always have been ritualised, either in honour of ancestors, genius loci, calendrical rites, or whatever the pertinent ingredient was at that place and time. I’m suggesting simply that the rock basin on the Mixing Stone was used for just such purposes. This is no spurious suggestion, but at the same time it’s important to recognise that my thoughts here represent merely an idea, nothing more—not a fact. Whilst we know full well that these carvings were imbued fundamentally with animistic properties—a simple ‘fact’—this functional idea is just that—an idea. Students and petroglyph-nuts need to understand this. And the faded cup-marks at its edge are perhaps merely incidental…. though I don’t buy that misself!

St. Columba’s Stone, Derry, Co. Derry

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Bullaun: OS Grid Reference – C 4312 1662

Also Known as:

St. Columb’s Stone

Archaeology & History

Not to be confused with the other St. Columba’s Stone at Shantallow, 1¾ miles to the north of here, this legendary rock was found in very close association—barely ten yards away—with one of St. Columba’s holy wells (in fact there were three holy wells hereby, but the others were dedicated to saints Adamnan and Martin). The two sites were inextricably related to each other, both in terms of their proximity and, more importantly, in terms of the symbiotic traditions the two of them had. And despite the relationship they had under the guise of one “St. Columba”, it’s pretty obvious that this was a thoroughly unchristian place to begin with.

St Columba’s Stone in 1837

As with many bullauns, it’s a relatively small stone with two deep hollows on either side. We don’t know for certain when the stone was placed here, but tradition tells us it was sanctified at this spot in the 6th century; and so it remained until June 9, 1897 when, deemed as being an “obstruction” on the roadway, it was uprooted and moved some 300 yards south where, a year later, it was incorporated into the base of a cross outside the Long Tower Church of St Columba, where it remains to this day (at grid-reference C 4303 1635).

The stone was still in situ when Thomas Colby (1837) and his mates were doing their work for the Irish Ordnance Survey, at a period when many an Irish antiquity was still frequented by local folks for ceremonies, both personal and social. Colby wrote:

The stone set beneath the cross

“In the centre of St. Columb’s Lane, adjacent to the Wells, there is a remarkable stone, called St. Columb’s Stone, which is popularly regarded with a still higher veneration by the aboriginal Irish of the district. It is of an irregular form, about three feet long, and ten inches wide: the height above ground is one foot and a half, and it has two oval hollows on each side, artificially formed. Many foolish legends are current among the peasantry respecting the origin of these hollows, which, it is supposed, are the impressions made by the saint’s knees when he leaped from the nail of the city. It may, however, be worth observing, that stones of this description are found in the vicinity of most of the Irish churches, and usually bear the name of the founder, or patron saint: they are always held sacred, and the rain-water, deposited in their hollows, is believed to possess a miraculous power in curing various diseases.”

William Doherty (1899) told how parts of the bullaun holes had been made “by pious pilgrims trying to remove chips as relics”, who then wore them as amulets for curative properties and good fortune; then later, “it was utilized as a Holy Water Font, to prevent further mutilation.”

References:

Colby, Thomas, Ordnance Survey of the County of Londonderry, HMG: Dublin 1837.
Doherty, William, Derry Columbkille, Brown & Nolan: Dublin 1899.

St. Columba’s Stone, Shantallow, Derry, Co. Derry

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Petroglyph: OS Grid Reference – C 4386 1934

Also Known as:

Chieftain’s Installation Stone
Inauguration Stone
St Columb’s Footprints
St Columb’s Stone

Archaeology & History

To be found in the grounds of Belmont House School, just 1¾ miles (2.8km) north of Derry’s other Columba’s Stone, this is one of the many petroglyphic “footprints” that folklore ascribes to Ireland’s saint Columb/Columba/Columbkille (and other variants). Said to have originally been carved at the great fortress of Grianan of Aileach, 4½ miles (7.2km) to the west, this great block of stone—roughly 6 feet square on top—has the distinct sculpturings of two feet, each about 10 inches long, etched into its sloping surface. Archaeologically speaking, there’s little more to say about the stone; but its traditions are another thing altogether and are of considerably greater importance…

Folklore

Like the carved footprint on top of Dunadd in Argyll with its association of tribal initiations, the traditions relating to this footprint follows the same path, so to speak. It was H.P. Swan (1938) who gave us a good summary of the olde lore here, telling that,

“It is almost absolutely certain that it was brought from the Grianan of Aileach after its destruction, probably by an O’Doherty for his own installation. If so, the task of removal was no joke, for the stone weighs some seven tons. It was the “crowning stone” of the Kinel-Owen, or, in other words, the stone upon which the chieftains of the great O’Neill clan were inaugurated. They reigned in Aileach for many centuries.

“At his installation, as supreme head of the clan, the newly-chosen chief was placed upon this stone, his bare feet in the footmarks; a peeled willow wand was put into his hand, as an emblem of the pure and gentle sway he should exercise over his tribe; an oath was administered to him by the chief ecclesiastic in the neighbourhood, that he should preserve inviolable the ancient custom of his country, and deliver the succession peaceably to his tanist (successor); after which, descending from the stone, he turned himself thrice backwards and thrice forwards, to signify that he was ready to meet all foes, from whatever quarter they might come; and was then, with wild acclamations, hailed as their chief by his assembled clan.

“At the time of Ireland’s conversion to christianity by St Patrick, that holy man visited the Grianan (about AD 443), where this stone had been so used for centuries before; Owen was then King; he was converted from Paganism to the new faith and baptised by Patrick; at the same time, the saint consecrated this stone, and blessed it as the crowning-stone of the Kinel-Owen for ever. Time, however, has proved his blessing futile, as may be read in the account of the Grianan, which was deserted by the Kinel-Owen after its destruction by the O’Briens in 1101.”

The ritual described here cannot be taken lightly, nor seen as a presentation of fiction, for its ingredients are found echoed in kingship rites in many cultures.

References:

Swan, Harry Percival, The Book of Inishowen, William Doherty: Buncrana 1938.

Knockraich, Fintry, Stirlingshire

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Standing Stone: OS Grid Reference – NS 60889 87739

Also Known as:

Canmore ID 45305
Knockcraich

Getting Here

Knockraich standing stone

From Fintry village take the B822 road towards Kippen. Only half-a-mile (0.8km) along, take the track on your left to Knockraich Farm and cafe. Go all the way through the farm along the track and out the other side then follow the fence downhill across the field. At the bottom, go through the gate towards the stone which you’ll already be able to see ahead of you, in the next field. Y’ can’t miss it!

Archaeology & History

This little-known four-foot tall monolith standing alone in the fields northwest of Fintry, just above the River Endrick, is a fascinating little fella! It stands at the western end of an elongated rise in the land, almost as if mimicking an ancient long barrow. But more intriguingly (for me at least) are the cup-markings that adorn each of its four sides.

Cup-mark at base of the north side

Cup-mark near top of west face

Upon first glance it seems that there are a number of such cup marks on the stone, but further inspection shows that only one occurs on each of the four faces. Near the very bottom of the stone on its north and south sides a single large cup-mark has been etched; and on its east and western faces, the cup-mark has been carved further up towards the middle of the stone, with the east-facing side having a groove running from near the top and stopping at the cup-mark. On top of the stone is a large ‘bowl’ (possibly natural, possibly man-made—it is difficult to say with any certainty) and a single cup-mark next to it. When Nina, Paul and I visited here a few days ago, a palm-sized smooth stone was resting in the large bowl on top, akin to the healing and divination stones found placed in bullauns in Ireland and other parts of the world.

The first description of any length was cited in A.F. Hutchinson’s (1893) paper on the standing stones of Stirlingshire in which he wrote:

“This stone…is placed on the bank rising up from the river. In shape it is approximately square—the two sides facing nearly east and west, measuring each 1ft 7in, the north face 1ft 6in, and the south 1ft 3in. These dimensions are uniform from top to bottom. The total girth is therefore 5ft 11in, while the height is 3ft 8 in. Orientation 225º. There are a number of cupmarks both on the top and side, as well as having several incised lines and other markings, some of which, however, give evidence of recent sculpture.”

Knockraich stone, looking south at Dunmore hillfort

Cupmark, hollow & stone on top

The more modern or “recent sculpture” was that of a human figure, now very faint, etched onto the most western face of the stone, beneath a large solitary cup-mark. When the site was visited and described by the Royal Commission (1963) lads, they gave a lengthier description of the carved elements on the stone, telling us that:

“On the top, which has been brought to an irregularly rounded point, there is an almost circular hollow measuring 5½in to 6in across and 2½in in depth; it is difficult to suppose that this is other than artificial, although its bottom shows differential weathering. The SE side of the stone shows several natural cavities, and a deep and wide vertical groove which is also presumably natural. The NW face seems to have been flattened to a certain extent, a slight ridge which is visible along part of either margin probably representing a survival of the original surface. On this face, 12in above the ground, a human figure has been outlined in pocked technique. It is in full-face, the features being indicated by pocked marks; the arms are extended jut below the level of the shoulders and the legs are widely spread with the feet turned outwards. The lower edge of a tunic or short kilt seems to be indicated by a single line between the legs. The figure is 8in heigh and measures 7in in breadth between the hands and 7½in between the feet. This face of the stone also shows a number of small natural cavities, together with a shallow cup which has a somewhat artificial appearance; this cup is in the centre of the face and 2ft 4½in above ground level, apparently at the upper margin of the flattened area. The figure lacks any distinctive characteristics which might afford evidence of date, but it may be relatively modern…”

Folklore

Mr Hutchinson (1893) told that,

“The stone seems to have brought down through the ages a tradition of sanctity in connection with it, as there is a legend to the effect that any attempt to move it is attended by convulsions of Nature and evil consequences to the rash disturber.”

Whether the position of the water-worn smooth rock found in the bowl on top of this standing stone has any ancient tradition, records seem silent on the matter.

References:

Hutchinson, A.F., “The Standing Stones of Stirling District,” in The Stirling Antiquary, volume 1, 1893.
Royal Commission on the Ancient & Historical Monuments Scotland, Stirling – 2 volumes, HMSO: Edinburgh 1963.
Royal Commission on the Ancient & Historical Monuments of Scotland, Archaeological Sites and Monuments of Stirling District, Central Region, Society of Antiquaries of Scotland 1979.
Smith, H. Guthrie, Strathendrick and its Inhabitants from Early Times, James Maclehose: Glasgow 1896.

Acknowledgements: Many thanks to Nina Harris and Paul Hornby for their help and attendance at this old stone.

Clach-na-Cruich, Fearnan, Perthshire

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Cup-Marked Rock: OS grid reference – NN 71868 44743

Also known as:

Canmore ID 25037
Clach-na-Gruich
St. Ciaran’s Seat
Measles Stone

Getting Here

Pretty easy to get to. It’s in one of the fields above the old farmhouse of Boreland on the western edge of Fearnan, a couple of hundred yards away on the other side of the road from the Clach an Tuirc.

Archaeology & History

Clach na Cruich — Clach-na-Cruich in 1884

In the field we find this great chair-shaped boulder with a great ‘bowl’ on it where the seating section is, and on its top and sides are a few cup-markings — MacMillan (1884) noted seven of them, two of which had half-rings around them, “associated together in a singular manner, and forming a figure like the eyes of a pair of spectacles.”

Folklore

Regarded in local legends to be an ancient initiation seat, this was taken over and ordained as being the seat of St. Ciaran at some time when the Celtic church started having influence up here.

The ‘seat’ of this great stone regularly fills up with rainwater and was, wrote William A. Gillies, “regarded as an effectual cure for measles, and there are persons still residing at Fearnan who were taken as children to drink from the water in the hollow of Clach-na-Gruich, the Measles Stone.” His lengthy account of the site told:

“In the district of Breadalbane, Perthshire – which has in it the Pool of St Fillans, famous for its supposed power of curing mentally afflicted persons – there are two boulders with water-filled cavities, which have a local reputation for their healing virtues. One is at Fernan, situated on the north side of Loch Tay, about three miles from Kenmore. It is a large rough stone with an irregular outline, somewhat like a rude chair, in the middle of a field immediately below the farmhouse of Mr Campbell, Borland. The rest of the field is ploughed; but the spot on which it stands is carefully preserved as an oasis amid the furrows. The material of which it is composed is a coarse clay slate; and the stone has evidently been a boulder transported to the spot from a considerable distance.

“In the centre on one side there is a deep square cavity capable of holding about two quarts of water. I found it nearly full, although the weather had been unusually dry for several weeks previously. There were some clods of earth around it, and a few small stones and a quantity of rubbish in the cavity itself, which defiled the water. This I carefully scooped out, and found the cavity showing unmistakeable evidence of being artificial. On the upper surface of the stone I also discovered seven faint cup-marks, very much weather-worn; two of them associated together in a singular manner, and forming a figure like the eyes of a pair of spectacles.

“The boulder goes in the locality by the name of Clach-na-Cruich, or the Stone of the Measles; and the rain-water contained in its cavity, when drunk by the patient, was supposed to be a sovereign remedy for that disease. At one time it had a wide reputation, and persons afflicted with the disease came from all parts of the district to drink its water. Indeed, there are many persons still alive who were taken in their youth, when suffering from this infantile disease, to the stone at Fernan; and I have met a man not much past forty, who remembers distinctly having drunk the water in the cavity when suffering from measles.

“It is is only within the lifetime of the present generation that the Clach-na-Cruich has fallen into disuse. I am not sure, indeed, whether any one has resorted to it within the last thirty years. Its neglected state would seem to indicate that all faith in it had for many years been abandoned.”

References:

Gillies, William A., In Famed Breadalbane, Munro Press: Perth 1938.
MacMillan, Hugh, ‘Notice of Two Boulders having Rain-Filled Cavities on the Shores of Loch Tay, Formerly Associated with the Cure of Disease,’ in PSAS 18, 1884.

Clach Brath, Baile Mor, Iona

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Bullaun Stone: OS Grid Reference – NM 286 244

Also known as:

Clacha Brath
Clachan-nan-Druidhean
Day of Judgement Stone
Druid’s Stone
World’s End Stone

Folklore

On this curious, broken, basin-shaped rock — thought by some to have at one time played a part in an old cross whose remains are in the Abbey Museum — are two deep cup-shaped hollows, in which were once “three noble globes of white marble” that were used for oracular purposes and were said to have originated in druidical rites. In Miss McNeill’s (1954) survey of the island, she tells that:

“near the edge of the path leading to St. Oran’s Chapel, there lies a broad, flat stone, with a slit and a cavity on its surface. Here there used to lie some small round stones which pilgrims were wont to turn sunwise within the cavity; for it was commonly believed that the ‘brath’, or end of the world, would not arrive until this stone should be worn through.”

The small stones that were once in the Brath were ordered by the Church to be thrown into the sea; but local folk replaced them with three other small stones, maintaining the traditional rites of this stone until they eventually stopped sometime in the 19th century. But in Major-General James Forlong’s (1906) study, he tells of a somewhat earlier mythic origin to this old stone, saying:

“In Iona the Druids are said to have made the flat altar stone called Clachan-nan-Druidhean, or Druid’s Stone, the stone of fate or of the last day, with round stones fitted into cup hollows on the surface, which the pious pilgrim turns round. The world will end when the stone is worn through. The Culdee monks preserved this monument.”

And what little is left is still preserved to this day. The curious “end of the world” motif was something that was grafted onto an earlier mythos: what Mircea Eliade called the “myth of the eternal return”, wherein Nature’s annual cycle —from birth, life to death and subsequent renewal, endlessly, through the seasons—was the original status, later transmuted by the incoming judaeo-christian cult of linear time and milleniumism relating to a literal “end of the world” when their profane myth of Jesus returning to Earth occurs. We might also add that the stones which once rested into the hollows of the Clach Brath would likely have possessed divinatory and healing qualities, as comparatiove studies suggest.

References:

Eliade, Mircea, The Myth of the Eternal Return,
Forlong, J.G.S., Faiths of Man – volume 1, Bernard Quarithc: London 1906.
Holder, Geoff, The Guide to Mysterious Iona and Staffa, Tempus: Stroud 2001.
McNeill, F. Marion, Iona: A History of the Island, Blackie & Son: Glasgow 1954 (4th edition).