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Tomb or burial place · Prehistoric · Highland

Tulach an t-Sionnaich

Excavation found the earliest known heel-shaped cairn (a mound of piled stones, often covering a burial) on the Scottish mainland folded inside two later rounds of rebuilding on the same spot.

A long low swell of turf follows the shore at the northern tip of Loch Calder in Caithness, its quiet outline giving no hint of what lies inside. Only when archaeologists cut into the stone in the early 1960s did it become clear that this was not one monument but three, each built over the last across many centuries: a small square burial chamber, then a distinctive rounded cairn built to enclose it, then a much longer cairn wrapped around both.

Before that digging, all that could be seen on the surface was an unremarkable stony mound some 60 metres long and 12 metres wide, higher and wider at its southeastern end, with a ditch cut into the ground nearby. The excavation changed that picture completely, revealing a passage tomb (a stone burial chamber reached by a narrow entrance passage) sealed inside a circular wall, itself later swallowed by a heel-shaped cairn (a monument with a curving, D-shaped forecourt named for its resemblance to the heel of a boot) and finally by a long trapezoidal cairn tapering from a broad squared front to a narrower, gently curved rear.

Only a scatter of pottery survived to date the sequence, but it was enough to place the earliest use in the Neolithic period, before the site fell out of use during the era of the Beaker culture. Today the northwestern, chamber-bearing side has been worn away by the rising waters of Loch Calder, while the bulk of the cairn survives under turf.

What follows is drawn from published sources, with each claim labelled by how firmly it is established.

The name

The name Tulach an t-Sionnaich is Gaelic for "mountain of the fox", though no record explains when or why the mound acquired the name.

History

During the Neolithic period, builders first raised a square burial chamber reached by a passage some 2.1 metres long that faced south, and enclosed it within a round cairn about 10.5 metres across. A circular stone wall ran around the outside of this cairn, and once the tomb had been sealed, the external entrance to the passage was closed off, shutting the chamber away from further use.

After what appears to have been only a short interval, builders raised a new cairn over the first one, giving it a heel-shaped plan with a curving forecourt at its front. This is reckoned to be the oldest cairn of its type known on the Scottish mainland, and its small scale places it early within the typology of such monuments. The new facade covering the old passage entrance was never broken through, though later disturbance has made it impossible to recover a complete plan of the structure.

Pottery recovered from within the heel-shaped cairn belongs to a plain, undecorated Neolithic style, showing that this phase of the monument was in active use during that period. The same evidence shows the cairn had already fallen out of use by the time the Beaker culture (a later prehistoric tradition named for its distinctive pottery) became established in the area, marking a clear break in the site's active life.

At some later point the whole structure was enclosed within a long cairn bounded by a low outer wall, its southern end reaching beyond the older facade beneath. This final cairn ran to about 38 metres in length, narrowing from a 10.2-metre-wide front to a 7.8-metre-wide, gently curved rear, and was set slightly east of the earlier cairn's axis, apparently to make use of a natural ridge and gain height above the surrounding ground.

Before the long cairn was built, later urns came to be deposited outside the enclosure, evidence that people continued to use the site for burial in some form even after its main structures had been completed. Selective excavation into the body of the cairn also identified cist-shaped compartments (small stone-lined boxes) built into the fabric of the mound itself.

In 1961 and 1963 archaeologists carried out partial excavations that uncovered the full sequence of building phases hidden beneath the mound's grassy surface. Their work exposed the passage tomb, the heel-shaped cairn raised over it, and the long cairn that finally enclosed both, along with traces of dry stone walling near the northern end close to the cut ditch. The rise in the level of Loch Calder has since eroded the southwestern side of the monument, including the area of the original burial chamber, though the greater part of the cairn survives intact and is now covered in grass.

Cultural influences

  • Successive Neolithic cairn building

    An early passage tomb was covered by a heel-shaped cairn and then a long cairn, creating a rare sequence of changing Neolithic burial forms on one mound.

Connections

  • Loch Calder

    The cairn stands beside the loch, whose rising water has eroded the south-western edge where the earliest burial chamber lay.

Discovery & excavation

Partial excavations in 1961 and 1963 revealed that a monument which looked from the surface like a single undifferentiated cairn was in fact three superimposed structures: an early passage tomb, a heel-shaped cairn built over it, and a long cairn enclosing both. Disturbance to the site meant a complete floor plan could not be recovered, but selective cuts into the mound also exposed cist-shaped compartments built into the cairn's fabric.

What to look for

  • The long, low mound

    The visible cairn today is the outermost, long trapezoidal phase, roughly 38 metres long, wider and higher at its southeastern end and tapering toward a curved northern end.

  • The ditch

    A cut ditch lies around 15 metres from the higher southeastern end of the cairn, associated with the northern part of the site.

  • Loch-eroded edge

    The southwestern side of the mound, where the original burial chamber once stood, has been cut away by the rising waters of Loch Calder.

Plan your visit

Location
58.5355°N · 3.5983°W
Nearest settlement
Watten
Access
Open access
Terrain
Moderate walking
Time needed
About 45 minutes
Best time
Daylight, when the long mound, ditch and loch-eroded edge can be read clearly.
What survives
Most of the grass-covered cairn survives, but rising Loch Calder has cut away its south-western edge and the earliest chamber area.

Opening & admission

  • Cairn at Loch Calder; south-western side has been eroded by rising water.

Nearby places

The setting

  • Tulach An T-Sionnaich Chambered Cairn from roadside — near Tulach an t-Sionnaich

    Photo: Ewen Rennie / Wikimedia Commons / CC BY-SA 2.0

Questions people ask

What is Tulach an t-Sionnaich?
A Neolithic chambered cairn at the northern end of Loch Calder in Caithness, built up in three phases over time and partly excavated in 1961 and 1963.
What does the name mean?
Tulach an t-Sionnaich is Gaelic for "mountain of the fox".
Why is the heel-shaped cairn significant?
It is identified as the oldest heel-shaped cairn known on the Scottish mainland, and its small size places it early within its monument type.
When was the site excavated?
It was partially excavated in 1961 and 1963, revealing the passage tomb, heel-shaped cairn, and long cairn beneath the surface mound.
Is the whole monument still visible?
No — the southwestern side, including the original burial chamber, has been eroded by the rising level of Loch Calder, though most of the cairn survives under grass.

Sources

  1. Wikipedia: Tulach an t-Sionnaich
  2. Davidson & Henshall, The Chambered Cairns of Caithness (1991)
  3. Wikidata entry: Tulach an t-Sionnaich

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