Ancient Monuments

History on the Ground

This site is entirely user-supported. See how you can help.

Cnoc Coig, shell midden 430m NNW of Seal Cottage

A Scheduled Monument in Kintyre and the Islands, Argyll and Bute

We don't have any photos of this monument yet. Why don't you be the first to send us one?

Upload Photo »

Approximate Location Map
Large Map »

If Google Street View is available, the image is from the best available vantage point looking, if possible, towards the location of the monument. Where it is not available, the satellite view is shown instead.


Latitude: 56.0172 / 56°1'1"N

Longitude: -6.237 / 6°14'13"W

OS Eastings: 136046

OS Northings: 688572

OS Grid: NR360885

Mapcode National: GBR BDZT.9YX

Mapcode Global: WGYFW.5180

Entry Name: Cnoc Coig, shell midden 430m NNW of Seal Cottage

Scheduled Date: 10 October 2016

Source: Historic Environment Scotland

Source ID: SM13655

Schedule Class: Cultural

Category: Prehistoric domestic and defensive: shell midden

Location: Colonsay and Oronsay

County: Argyll and Bute

Electoral Ward: Kintyre and the Islands

Traditional County: Argyllshire


The monument is a partially excavated prehistoric shell midden probably formed during the late Mesolithic around 4500BC. The midden is visible as a low grass-covered mound rising to around 1-2m above ground level. Excavations indicated that the midden is irregular in plan form, measuring approximately 25m in diameter from northwest to southeast and 20m from northeast to southwest. The monument is located at around 10m above OD in an area of sand dunes and rocky outcrops approximately 220m inland from the east coast of the island of Oronsay at Port na h-AthaIt.  

The scheduled area is irregular on plan to include the remains described above and an area around them within which evidence relating to the monument's construction, use and abandonment is expected to survive, as shown in red on the accompanying map.

Source: Historic Environment Scotland

Statement of Scheduling

The cultural significance of the monument is expressed as follows:

Intrinsic Characteristics

The site was the subject of antiquarian investigations probably in the 1880s and early 1900s. A more substantial excavation during the 1970s recovered around 70-75% of the midden material, identifying hearths, stone-filled post holes and other features. Additionally human skeletal remains, lithic and organic artefacts including stone limpet hammers, anvil stones and bone implements were also recovered. The remains of backfilled trenches can be seen on the ground surface. However, as the excavations were incomplete, substantial midden deposits are expected to survive. This is further evidenced by concentrations of midden material exposed in rabbit burrows across the monument. These remains can enhance our knowledge about how Mesolithic settlers lived in the area.

The monument represents a focal point for coastal resource gathering during early-prehistory with a high potential to support future research into the prehistoric occupation of Oronsay and the islands of western Scotland. Scientific dating of organic material recovered from the earliest phase of Cnoc Coig provides an approximate date for the initial deposition of midden material between around 4515 and 4495 BC. The uppermost layer is likely representative of the later phase of occupation around 4340 BC. The site of Cnoc Coig appears to have been occupied at a later date and for a shorter time period in comparison with other prehistoric middens on Oronsay.

Contextual Characteristics

Cnoc Coig retains high potential to improve our knowledge about the environment at the time which was much different to that today. Borehole samples have suggested that the monument was formed on a sand dune that would have lain adjacent to the coastline. A study of land molluscs suggest the area was also under dense vegetation or woodland. This location would have provided a ready supply of shellfish and other marine resources for the population of Mesolithic and Neolithic Oronsay.

Today the midden lies on the southwestern side of a low rocky outcrop, amongst relict sand dunes and raised beach deposits. Thick gorse surrounds the monument on its northwestern, western, southwestern and southern sides. There are views to the east and southeast from the monument towards the present day coastline, which has moved approximately 200m in these directions since the monument's formation.

This is an important site in a coastal landscape on Oronsay that appears to have been intensively exploited during the late Mesolithic. As a group, these sites provide key evidence for Mesolithic settlement of the islands of western Scotland. In addition to Cnoc Coig, there are two extensive middens known as Caisteal nan Gillean I & II (SM6288) located approximately 600 m to the south-southwest of the monument, and a third midden known as Cnoc Sligeach (SM13580) located approximately 1.3km to the east-northeast. A fourth midden, Cnoc Rioch (Canmore ID 37800), is recorded 500m to the northeast of the monument. By comparison with these, Cnoc Coig has a lower profile.

Although other Mesolithic sites are recorded on the nearby islands of Colonsay, Islay, Jura, Coll and Mull, the only known and comparable monument in form and in the extent of the recorded assemblage of artefacts outside of Oronsay is the shell midden on Risga (SM7829), Loch Sunart, approximately 40km to the north of Oronsay.

Associative Characteristics

The first investigations of Cnoc Coig may have been undertaken in the early 1880s with finds displayed at the International Fisheries Exhibition in 1883, but since lost. The monument was later investigated by Bishop and Buchanan in 1911, who referred to the site as the 'Viking mound' - or 'Druim Harstell' – due to a ring-headed pin recovered early in their investigation. Archives from these investigations are held in the collections of the Hunterian Museum, Glasgow. The excavations undertaken by Mellars in the 1970s are well documented and, taken together with more recently published scientific analysis of the Oronsay middens, have significantly added to our consciousness of Mesolithic hunter gatherers in Scotland.  

National Importance

The monument is of national importance because of its potential to make a significant addition to our understanding of how Mesolithic settlers of the Inner Hebrides lived. Although there have been various phases of excavation on the site, substantial archaeological deposits are expected to survive undisturbed. The potential for survival of artefacts, environmental samples and structural features means that this monument can also provide insight into the relatively understudied transition from the Mesolithic to the Neolithic. Its importance is enhanced by its association with the wider coastal landscape of prehistoric midden sites on Oronsay, one of the largest concentrations of such sites in the UK. Our understanding of the distribution and character of shell middens and methods for gathering coastal and marine resources in prehistoric Scotland would be diminished if this monument were lost or damaged.

Source: Historic Environment Scotland



Historic Environment Scotland reference number Canmore ID 37818 (accessed on 13/06/2016).

The site is recorded as 'Druim Arstail' (WoSAS 2415) on the West of Scotland Archaeology Service Historic Environment Record.

Anderson, J., 1898, Notes on the contents of a small cave or rock shelter at Druimvargie, Oban; and of three shell mounds on Oronsay, Proceedings of the Society of Antiquaries of Scotland 32, 298-313, UK

Buchanan, M., 1911, Oronsay 1911, Unpublished document held by the Hunterian Museum, University of Glasgow (ref. P17-41 (Bu, UK

Fieller, Gliberton & Timmins, 1987, Sedimentary Analysis of the Shell Midden Sites, in; Mellars, Excavations on Oronsay: prehistoric human ecology on a small island, Edinburgh

Grieve, S 1885, The Great Auk or Garefowl (Alca impentis, Linn.): Its History, Archaeology and Remains, Jack, London

Jardine, W 1978, Radiocarbon ages of raised-beach shells from Oronsay, Inner Hebrides, Scotland: a lesson in interpretation and deduction, Boreas, Vol. 7, pp.183-196, UK

Jardine, W Jardine, D 1984, Minor excavations and small finds at three Mesolithic sites, Isle of Oronsay, Argyll, PSAS, Vol 113, pp.22-34, UK

Mellars, P 1987, Excavations on Oronsay: prehistoric human ecology on a small island, Edinburgh

Mercer, J 1968, Stone tools from a washing-limit deposit of the highest post-glacial transgression, Lealt Bay, Isle of Jura'. Proc Soc Antiq Scot 100, 1–46, UK

Mercer, J 1980, The Palaeolithic and Mesolithic occupation of the Isle of Jura, Argyll, Scotland, Almogaren 9-10, pp.347-67, UK

Pollard, T Atkinson, D & Banks, I 1993, Risga (Ardnamurchan Parish), Mesolithic shell midden; prehistoric occupation site, Discovery and Excavation in Scotland, Council for Scottish Archaeology, UK

Wicks, K Pirie, A & Mithen, S 2014, Settlement patterns in the late Mesolithic of Western Scotland: the implications of Bayesian analysis of radiocarbon dates and inter-site technological comparisons, Journal of Archaeological Science, 41 pp.1-17, UK


HER/SMR Reference

WoSAS 2415

Source: Historic Environment Scotland

Other nearby scheduled monuments is an independent online resource and is not associated with any government department. All government data published here is used under licence. Please do not contact for any queries related to any individual ancient or schedued monument, planning permission related to scheduled monuments or the scheduling process itself. is a Good Stuff website.