Making Metal, Casting Society at The Cairns, Orkney

ring headed pin moulds with cast pin
Ring headed pin moulds with cast pin

New radiocarbon dates from The Cairns archaeological excavation shed light on the possible structure of society in the 3rd and 4th Centuries AD in Orkney.

Martin Carruthers, Site Director at The University of the Highlands and Islands Archaeology Institute research excavation at The Cairns, Orkney, talks about the latest research findings from the site.   

“We have been very lucky at The Cairns over the years of the excavations to find a substantial set of remains and residues that relate to Iron Age metalworking. This includes at least two iron-working furnaces, and many other features and artefacts, but there is one particularly big and concentrated event that took place beyond the broch in the northern part of the site, in the area we call Trench M. The remains of this episode include furnaces, bronze waste; bronze splashes and droplets, crucibles, and very significantly: moulds for casting fine bronze objects. Over sixty moulds and mould fragments have been recovered. These were used to cast a variety of objects ranging from simple bronze rings, to distinctive decorated dress pins, called ‘projecting ring-headed pins’, and penannular brooches, which are the lovely open-ring, cloak brooches that are sometimes referred to as ‘Celtic’ brooches.

The remains of 'Structure K' where the jewellery-making episode ocurred
The remains of structure K where the jewellery-making occurred

The volume and nature of the items being produced suggests that this was a socially significant collection of prestigious items aimed at denoting the identity, and status of those who were to wear the items; badges of their belonging and importance within the community. Importantly, it is the entire suite of materials found together, as well as their precise distribution pattern within the trench, that indicates strongly that this material relates to an in situ metalworking event, rather than a secondary event, such as merely the refuse disposal of old moulds, or even their ritual deposition. This is important because the closer we can get to the actual context of the metalworking events the clearer and more direct our picture of the process becomes.

The moulds for casting the bronze jewellery were found in an area several metres in diameter, scattered within and across the remains of an Iron Age building (Structure K) that was already ruinous and unroofed by the time the metalworking was happening. That building was itself found to overly the partially in-filled remains of a large enclosure ditch that had originally surrounded the broch period settlement. We therefore knew from the assessment of the layers (the stratigraphy) on site that the metalworking episode did not occur very early on in the sequence of events and buildings on site but it remained to be seen if it was going on towards the end of the monumental broch period on site, or if it was actually occurring after the broch was put out of use, which we know occurred around the mid-Second Century AD based on previously obtained radiocarbon dates. The calendar date of the metalworking was therefore of great interest. Did the jewellery-making episode date to the period late in the life of the broch, or was it happening after the broch itself was decommissioned and put out of use?

Two moulds for casting penannular brooches
Two moulds for casting penannular brooches

Craft and Chronology
Newly obtained radiocarbon dates make it clear which of these scenarios is correct. The new dates show that the jewellery-making occurred sometime between the AD240’s and the mid AD300’s. This places the metalworking very definitively after the end of the broch. Now, with this enhanced understanding of the chronological and structural context of the metalworking we can begin to consider the social context of this episode of metalworking. It is happening at a period of quite dramatic change in the material circumstances of Northern Iron Age communities in Scotland, at the end of the conventional Middle Iron Age and the beginning of the Later Iron Age periods, and contemporary with the mid to later Roman period further South.

It is very interesting that this episode therefore occurred after the culmination of the monumental phase of the site; after the demise of the massive broch at the heart of the community. One prominent British Iron Age scholar (Professor Niall Sharples from Cardiff University) has previously suggested that across Atlantic Scotland a pattern can be observed in which, around the time of the end of the brochs, when monumental domestic architecture is on the wane, there is a very substantial rise in the volume of items that reflect the presentation of the individual through personal adornment. This phenomenon seems to be reflected at The Cairns also.

Jewellery as social currency: Feasting, and gift-giving?
At the end of the bronze-casting event a fairly thick, very rich animal bone midden was laid down in the vicinity and slightly overlying the metalworking area. The close relationship between the metalworking and the animal bone is shown by the presence of a few of the crucibles and mould fragments amongst the midden also. What’s in this midden?

Well lots of domesticated animals, including cattle, sheep and pig, especially large cattle long bones. In addition, there were other mammal bones such as red deer, otter, and even a small quantity of horse. The midden also contained carbonised soils, ash and broken fragments of pottery. Many fire-cracked beach cobbles were also excavated, and these represent the exploded remains of ‘pot-boilers’, heated cobbles that were immersed in vessels to heat up water and cook some of the food. It seems that the people gathered at our feast were consuming beef on the bone, boiled pork, and roasted mutton and venison, some of which may have been washed down by beverages drunk from many pottery vessels.

The close stratigraphic association between the fine metalworking and the feasting raises the question of what exactly was going on here. One possibility that I like very much is that the feasting could be the spectacular social event at which the products of the jewellery-making were handed out, or gifted, to their intended recipients by those who had sponsored the metalworking in the first place. We may therefore be peering into the social circumstances of the jewellery-making and the distribution of its products amongst the community at The Cairns. If this is so, then it is a fascinating insight into the moment at which objects like the pins, brooches and rings started off on their biographies, their journey through people’s lives.

This is a very rare opportunity to see more clearly the initial nature of the social and political significance of these objects from their start-point. It would mean that the sharing or gifting of the jewellery was surrounded in the circumstances of a big social occasion, a massive party, if you like. We are seeing their birth and the important role they played in the power-play and social strategies of Iron Age groups and individuals. With the circumstances of the jewellery-making we are able, for once, to investigate the intended status and significance of these items within the context of their birth, rather than depending on the information we usually get, which is based on the discovery of these objects much later in their lives, in fact at the end of their lives, when they went in the ground, perhaps many decades, or more, after they were originally made and worn. Most theories about the brooches and pins and their role in society have been based on what we glean from them in this end-state, but the assemblage of metalworking evidence from The Cairns; the moulds, crucibles, and other items, together with the massive remains of the feasting allows us to grasp what was going on at the point in time when these jewellery items were instigated.

Jewellery, Society and the wider Northern Scottish Iron Age
It is highly intriguing that the birth of these prestigious pieces of jewellery appears to have been accompanied by communal, outdoor feasting and judging by the volume of animal bone it involved a large part, if not all, of the community. In the absence of the big spacious monumental buildings, such as the brochs, which may have previously served to gather large numbers of people under one roof at important times in the life of the community, we can ponder whether feasting events like this were the new arena for expressing the identity and solidarity of the community.

If we now recall Professor Sharples’ aforementioned thesis that the changes at the end of the Middle Iron Age to late Iron Age involved a major transformation of the way people expressed their social identity, from the communal to the individual then this evidence for big community feasting in the early part of the Later Iron Age is very interesting. Perhaps this serves to somewhat modify that concept, because in the post-broch era at The Cairns, for one, the community appears to have retained ways of expressing their greater collective identity. Nevertheless, it seems unlikely that everyone was singled-out and gifted one of the pieces of fine jewellery that were produced.

At one level, perhaps, everyone in the community was involved in the feasting, but only some were ennobled by receiving a pin; a ring, or a brooch. So it may well be that we are looking at the strategies for creating and maintaining the concept of the entire community at the same time as signalling social difference, and hierarchy within the community of this post-broch period. If so, the excavations are really coming up trumps in terms of allowing us to peer into the social circumstances of Iron Age communities.

New dates for Structure B1: Have we found the elite sponsors of the metalworking?
The period of the jewellery-making is after the end of the broch and we were previously unclear which buildings amongst the many post-broch structures were occupied at the time of the bronze-working. The new dates also allow us to pin-point whereabouts on site, at least some of, the community were living at the time the jewellery-making was taking place. Armed with the new radiocarbon dates, it turns out, that one of the large rectangular post-broch buildings (perhaps a Wag-like building of the type found in Caithness and at The Howe in Orkney) known to us as Structure B1, located about 30 metres to the south-west of the jewellery-making area was first constructed and occupied between the Mid-3rd to 4th Centuries AD, and therefore at the same time as the metalworking.

The big formal hearth in Structure B under excavation- a high status bui...
The large formal hearth in Structure B under excavation

Structure B1 lies directly over the reduced and in-filled remains of the broch. One of the most remarkable aspects of this building is its very large, formal and complex central hearth, which was over 3 metres in length in its fully developed form. This hearth and the central location of the building directly juxtaposed with the remains of the abandoned broch almost co-opting its former position and grandeur have always made us wonder if it was one of the key buildings in the immediate post-broch period at The Cairns, quite possibly the highest status building on site at that time, and may be the successor to the central broch in socio-political terms.

It is intriguing therefore to now know unambiguously that Structure B1 was contemporary with whoever was managing the wealth required to sponsor the lavish jewellery-making on site. Pushing this further, it is tempting to speculate that it was the important and powerful household resident in Structure B1 who instigated and organised the production of the jewellery, and the feasting, with all the capacity that those remarkable objects and events had for the creation and maintenance of the post-broch Iron Age community at The Cairns.”

Martin Carruthers, Site Director at The Cairns and Programme Leader for MSc Archaeological Practice, University of the Highlands and Islands Archaeology Institute.

Martin would like to thank Professor Dave Barclay, Forensic Consultant, and Professor Emeritus, Robert Gordon University Aberdeen for the very kind and helpful donation, which made it possible to fund the most recent radiocarbon dates discussed in this piece.

If you would like to explore the possibility of studying and contributing to the research undertaken at the UHI Archaeology Institute at undergraduate or postgraduate level then please either e-mail us at or see our website.


The Cairns Day Twenty. The Last Post. 2017

Thanks to Rik Hammond

Well we have reached the end of the excavation season at The Cairns. Let’s review what we set out to do and what was achieved.

Birth of a broch: the southwest extension

We extended the main trench on the south-western side of the broch this season. This was quite a large new area, and I must confess that the intention here was that we would not necessarily do a great deal of work in this area this year. I wanted to get a better more expansive view of the southern arc of the broch wall and possibly see hints of the extramural complex of buildings. However, from the outset the deposits and features in this zone were very intriguing and potentially conveyed important information about the early stages of the establishment of the broch.

Hanneke excavating in the terrace cut around the broch exteriorThe more time we spent in this trench the more that was borne out. We have long inferred that the preparation for building the broch involved cutting a large terrace into the hillside that it sits on. The logic for this hypothesis was that: in several places that we have reached the outer foot of the broch wall it is level to within a few centimetres, and this is despite the fact that it sits on a hill-slope or gradient of 1 in 20 (in other words the hill descends around 2 metres in height over the span of the 22 metre diameter broch). Obviously this would have made for an extremely sloping broch and interior without some modification.

At a distance varying between 3 and 6 metres out from the southern wall-face of the broch we could clearly see the natural glacially-derived clay only a few centimetres beneath the turf. Between there and the broch wall-face, however, it disappears and we have archaeological soils and features instead. This shows that the natural clay had indeed been cut into on its up-slope side. This year the southwest extension has allowed us to prove this terrace does exist and that the builders of the broch must have seriously landscaped the hillside by moving hundreds of tonnes of earth, clay and boulders to create a level platform for the broch. A huge effort was put into the formative stages of building the broch and shows us just what a substantial monumental project the building of the broch actually was.

Of Boundaries, Beads and other Bling!

Another surprise discovery from the SW trench extension this year was the presence of the ditch. Although we have known for some time (from geophysics and excavation on the northern side of the broch) that The Cairns, like many broch sites, was contained within a large ditched enclosure we hadn’t anticipated that the ditch trench would actually appear in the trench even if only present as an edge of the ditch.

We have been able to sample excavate the ditch and it turned out to be very rich in artefacts and animal bones, indeed, with lots of large chunks of pottery vessels and several metal objects; pins and the like. Ditches were clearly often receptacles for midden and refuse, however, they were also quite important symbolic boundaries between the community and the outside world, and this may be reflected in the types of materials, objects and deposition that occurs in them. So in future seasons we will do more work in the ditch. In many ways its a dramatic space, with lots to tell us in terms of the way the community lived and worked, but maybe also about their ideologies.


One of the artefactual highlights of the season also came from high up in the in-filling of the ditch. This was the so-called ‘proto hand-pin’, a type of decorative Iron Age bronze pin which are thought to have been in currency in the 3rd to 5th Centuries AD. As well as being a beautiful object in its own right, this little pin is instructive in giving us an early indication of when the ditch became fully in-filled.

blue glass bead

And staying with flashy bling for a moment the other rival for artefact of the season has to be the little blue glass bead that came from one of the cells in the broch. This beautiful little object looks likely to be a 1st or 2nd Century AD Roman type, known as a bi-conical blue bead, and only a couple of others have been found at Scottish Iron Age sites, including Traprain Law in East Lothian, and Hownam Rings in the Scottish Borders. It may show how the site’s occupants were plugged into fairly extended exchange links with the Roman province.

Excavation of the Broch Floors

Inside the broch, the part of the team supervised by Rick Barton did a great job of dealing with the sensitive floor deposits. Work concentrated on the Western part of the broch interior. This area has previously been left at a higher level than in the east, simply as a result of our excavation schedule, and this season was our opportunity to explore this side of the broch more, and bring things into the same phase across the whole broch. It wasn’t long before interesting features were emerging. Under the uppermost rubble, a late hearth was uncovered occupying a central position within the western zone. It was large, and well-used judging by the heat cracking across the large base slab, but perhaps lacked the formality one would expect to see in primary, or original, hearths inside brochs. The vast quantity of charred organic material from deposits surrounding the hearth will yield lots of information about how this hearth was used. The way in which the hearth appeared to be sitting on top of a pronounced bump in the floor of the broch indicates it may be mounded up over an earlier hearth, and by the time we were finishing work this season there were hints of this situation in the form of edge-set stones and other heat-affected deposits emerging from beneath the edges of the hearth.

Jo sampling the broch floor deposits

In the eastern side of the broch interior we undertook only a little work this year, as we want to wait until we have the west side down to the same level before proceeding too far, however, when we were joined by Dr. Jo Mackenzie, a specialist in soils and floors we undertook some excavation and sampling of the floors in this side of the broch. The floors were seen to be very rich and they possess very nice stratification (clearly laid down layers) that will help tell a very good story of life inside the broch two thousand and more years ago. The dark organic deposits seen in section show many thin layers of occupation, dark brown ones with charred plant materials, red peat ash ones, paler silty layers, etc, but when they are examined under the microscope it will be possible to see many more, otherwise invisible, layers that will be full of information on the different activities and activity areas within the broch; and the conditions prevailing at any point in the history of the broch.

The Broch Village

This year we were able to explore the extramural settlement, or village, that lies around the outside of the broch. We had a substantial window onto this settlement in the form of Trench Q, supervised by Dave Reay, and also the southwest extension also brought us into contact with the settlement. In Trench Q, a serious amount of rubble and ashy soils effectively sealed and masked the features of village buildings here, and it took sometime to reach the upper walls of buildings. However, Dave and his team were able to reveal the wall-tops of at least two, possibly three, Iron Age buildings across Trench Q. One of these has a nicely built curving wall and may turn out to be a roundhouse. The other was constructed by revetting into existing soils and rubble and may well be a building dating to later than the broch itself.

Trench Q before the rain toayMeanwhile, in the southwest extension the same terrace cut discussed above, also contained the walling of a building that may well turn out to be part of the broch village. Indeed, this may reveal very telling information about the nature of the relationship between the broch and village. There is a debate in Scottish Iron Age studies about how contemporary the villages that surround brochs are with the construction of the brochs themselves. Some scholars favour the idea that villages developed around broch towers gradually, and were subsequent to the building of brochs, but others consider the villages to have been part of the plan from the outset, especially in Orkney and Caithness, perhaps, where the village buildings tend to have a very integrated, and planned appearance. The presence of a village building in the construction terrace of the broch may well tell us that the plans for the broch included village buildings from the outset. This will be a very significant piece of evidence in the debate, and it arises from the fairly unique way in which the broch builders chose to build and to deal with the topography, sculpting the hill slope in the first place.

The Souterrain

One of our aims this season was to deal with the deposits inside the souterrain on the eastern side of the broch. We excavated the deposits that in-fill the souterrain and took lots of soil samples to try to understand the composition of this in-fill. What’s more the way is clear for us to try to chemically analyse the floor of the souterrain to try to glean more information about how it was used.

OLYMPUS DIGITAL CAMERAA very odd feature of the souterrain seen in a previous season was the quern installation set up on the roof of the souterrain at its southern end. Essentially, two rotary querns had been set up inverted over an intentional aperture in the souterrain lintels. The central holes of the querns were aligned with the aperture, and the entire feature conveys the impression of being used to pour something into the underground passageway from above. There are several instances of Iron Age querns reused in this way to form a porous lid on pits in wheelhouses in the Western Isles, and in one instance it was suggested that there may have been libations being poured into them! Now that we have been able to excavate and acquire soil samples these will be subjected to phosphate analysis, amongst other analyses, to try to discern what trace there might be of any substance that was being poured into the hole in the roof.

Different ways of seeing the site: aerial images and 3D modelling

This year at site we have been able to take advantage of the burgeoning new technologies like never before. The use of UAV’s (commonly known as drones) has been rapidly revolutionising the elevated perspective that archaeologists are able to get on archaeological sites. We were massively assisted in gaining this broader context this year by the UAV work of artist Rik Hammond and my colleague Dr. James Moore. Their use of the UAV several times during the course of the site has given us a fantastic aerial perspective on the site and its landscape.

The second new technology requiring acknowledgement here is that of 3d computer modelling. Throughout the period of the excavation one of our MSc students Jim Bright has been developing his skills in this domain. The results of some of his models have been posted here already, and there will be many more models. These are not just aesthetically pleasing models of the features and artefacts but actually useful in research terms as they allow us to gain privileged perspectives otherwise difficult or even impossible to acquire.

Meanwhile, another colleague Dr. Hugo Anderson-Whymark has produced a complete, whole site 3D model of The Cairns. This is a massively useful and impressive piece of work, that again allows us to interrogate lots of different aspects of the features and structures of the site. Again it provides an incredible tool for visualising the site in all its detail. The link to Hugo’s fabulous model is given here: Here’s Hugo’s model and a little blog within the blog that he has prepared for it: Enjoy!
The Cairns Broch Excavation, South Ronaldsay, Orkney The Cairns is an Iron Age broch – a massive circular structure with thick defensive walls that would have risen …

‘Over the last few years I’ve produced 3d models of various archaeological sites and artefacts in Orkney further afield and on Monday I finally got the chance to scan The Cairns. It’s a large and complex excavation site, with lots of thin projecting stones that present a real challenge for 3d modelling – the sort of challenge I like! The 3d modelling technique I use is ‘structure from motion’ photogrammetry which produces 3d models from overlapping photographs taken on any digital camera. In total I took 1648 photographs for the site over a few hours, when the sun and showers permitted. Most of these images were taken vertically from a pole, but within the broch I took images from a range of angles to capture the complex arrangements of stone orthostats. After 10 hours processing with Agisoft Photoscan on my PC, the model I’ve uploaded to Sketchfab appeared on my screen. This model offers a great way to explore the site, as the archaeology is more easily understood from above, but it also forms an important part of the site archive as the model is tied into the site grid and captures the vast progress made in the 2017 excavation season’.

And finally…

All in all, it has been a very fruitful and enjoyable season, with a lot learned about the nature of the site, from its beginnings to the end, major features of the site such as the excavation of later broch floors, the broch construction platform and the ditch will immeasurably help us to understand the character of the settlement, and the finds this year have been very rich and highly useful in a number of ways to elucidate issues relating to dating, the status of the community and their depositional practices.

Now some thank you’s! I’ll take this opportunity to thank the entire project team for their unstinting humour, patience and enthusiasm. Without them the site would of course remain unexcavated, and its only through their sterling efforts that we begin to understand what was going on at the site more than 2000 years ago!

This year the donations made by the visiting public have been more substantial than ever before. We benefitted from the largest number of visitors to the site of any season so far, and they were very generous in their expression of support for the project. The funds will now be spent on important aspects of furthering the research, such as radiocarbon dating the beginning of the broch, and understanding the major metalworking episode on the site. I would like to thank all of the visitors and donors, and for allowing us to communicate our findings at the site.

Finally, I would like to thank Charlie and Yvonne Nicholson and all of their family and friends in South Ronaldsay for their many acts of assistance and generosity. Our time at The Cairns is made possible, enjoyable and very amiable due to their great kindness.

Thank you!

Martin Carruthers, Site Director.


Geophysics at The Cairns 2017

Gordon (2)Whilst the excavation at The Cairns has been up and running, myself and Gordon Higgs (a student from Sheffield University) have both been undertaking professional Placements with the project to undertake geophysical survey in the fields surrounding The Cairns.

The aims of this survey were to investigate the landscape of the Broch and to identify the precise location of the enclosure ditch around the front, (Eastern side) of the broch and to identify any evidence for additional human activity nearby.

Two different types of geophysical survey were used, resistivity and magnetometry. Resistivity survey uses an electric current to measure the resistance of the soil, from which it is possible to identify disturbance (including past human disturbance) in the soil. Resistivity is ideal for detecting ditches and stone built features, because these features will have a different resistance from the surrounding undisturbed soil. Magnetometry survey measures changes in the magnetic field which can detect heat affected and burnt features such as hearths or fuel ash middens, metal artefacts and other past disturbances.Maginterprated-page-001The results of the survey show that the landscape has been heavily ploughed in the recent past and has disturbed archaeology in places. Nevertheless, the ditch surrounding The Cairns has shown up in both types of survey. Indeed, the anomaly on the survey results showed that it appears to be a double ditch feature. These substantial ditches are passed through by a linear feature, which is a couple of metres wide and runs from the broch sown slope towards the coast. This feature appears to be an ancient ‘hollow way’, or sunken track, and could also be partly related to a lintelled passageway referred to by the antiquary the Rev. Alexander Goodfelow over a hundred years ago.

At the bottom of the field just south of The Cairns an earlier geophysical survey showed an arc in the corner of the survey. A test pit was excavated there earlier this year and identified a curving stone feature that looks like a well-built wall within an ashy soil matrix, and a fragment of a saddle quern of prehistoric type. When we extended the geophysical survey to cover more of this anomaly it showed a series of semi circular features with possible central hearths. These anomalies could be related to houses in a fairly large settlement and/or associated structures like workshops.

There may be as many as 6 or 7 of these buildings. These look very similar to Bronze Age houses seen in the World Heritage Area of Stenness/Brodgar and in other locations in Orkney and Shetland.  This exciting prospect could be tested by excavation to confirm the nature of these features.

We were hoping to find the continuation of these structures in the next field to the south, however, the remains have either been ploughed away or are smaller than expected and obscured by the field boundary itself. This lower field did show another possible circular feature and a very strange linear anomaly on the resistivity results. An igneous dyke (or possibly two) run through the lower field which was easily identifiable by our magnetometer results.  This natural geological feature is interesting in its own right as we know prehistoric communities treated volcanic dyke rock as a resource, sometimes quarrying such sources of igneous material for stone artefacts and crushed up the rock for the ‘temper’ that they mixed into the clay of ceramic pots.

There are many more discoveries in the geophysics survey undertaken and the survey work has confirmed that The Cairns broch was not an isolated feature in an empty landscape, it was part of an active, evolving landscape and it would be interesting to test some of these features to confirm if some of them are contemporary with the broch. Even though the weather seemed to be against us some days, the results from the geophysical survey have been very informative, hinting at the wider landscape and future stories for archaeologists to uncover.

Leonie Teufel, MSc. Archaeological Practice Student, UHI

The Cairns Day Nineteen 2017

A new floor revealed in the bottom of a key-hole sondage by Jo
A new floor revealed in the bottom of the key-hole sondage by Jo

Today was the second last day on site. Despite the start of the process of covering up the site in earnest, we nevertheless still carried out some exciting work.

In the broch, yesterday’s blogger; Jo, continued to take special micromorphology samples from the floors. Working in the ‘central passageway’, which is a kind of corridor space that permitted the occupants to access several rooms set against the southern side of the broch, Jo was able to take a sample and reveal a lovely floor deposit underlying the dark, organic occupation deposits. This is really good news because it means that almost all of the areas that we have investigated floors across the whole of the eastern and central areas of the broch we have this fairly standard process of floor-making in evidence. What happens is that nice clean clay floors are laid down, presumably as a kind of beaten earth floor and then these floors are lived and worked upon. This human activity then produces detritus and organics that come to look like thick black charcoal rich deposits. These contain wonderfully rich sources of info’ about how people used the broch.

Not our lunchtime slice of chocolate cake, but a lovely soil block comprising many floor deposits sampled today
Not our lunchtime slice of chocolate cake, but a lovely soil block comprising many floor deposits sampled today

Today when Jo was working in the floors she also found a piece of unburnt wood in one of the dark lenses of occupation. This is a very unusual find as, obviously, wood that hasn’t been charcoaled is prone to decay!

The antler tool or mini-pick found near the late hearth in the broch
The antler tool or mini-pick found near the late hearth in the broch

Elsewhere in the broch, in the western zone, work on the occupation deposits around the late hearth, produced lots of antler, including what appeared to be an antler tool, perhaps for tending the hearth, as well as lots of other animal bones, and what appears to be the edges of an earlier, probably more formal hearth underlying beginning to emerge.

We will be concentrating on the final cover up of the site tomorrow, so only a few things require to be completed and recorded now- but it has been a very good season, and I’ll be rounding that up in tomorrow’s blog. Tomorrow we’ll also tell you about all the fascinating geophysical survey that has been happening at the site while we’ve been digging.

Cairns Bairns! the samples wrapped up for travelling off site to be assessed
The Cairns Bairns! Actually samples wrapped up for travelling off site to be assessed

But as a treat here’s an extra blog piece from Rik Hammond below. Rik’s an artist that has been working alongside us on site for several years.

Martin Carruthers, Site Director.

DCIM100MEDIADJI_0009.JPGMy name is Rik Hammond and I’m a visual artist based in St Margaret’s Hope – just up the road from The Cairns, here in South Ronaldsay.

Much of my practice focuses on the archaeological landscape of Orkney (including sites such as The Cairns and Ness of Brodgar) and I’ve been coming along to The Cairns – to observe, interact with and record the site and team – for several years now.
Often I’ll be found atop the spoil heap, drawing, or recording aspects of the site and surrounding landscape using photography, video and GPS. Alongside developing creative work at sites such as The Cairns, I co-direct the Yesnaby Art & Archaeology Research Project (YAARP –, in partnership with Dr James Moore
at the University of the Highlands & Islands Archaeology Institute.
YAARP is a multi-year,interdisciplinary, team-based project focusing on the landscape, archaeology and (pre)history of the township of Yesnaby, on the west coast of the Orkney Mainland. Being on site at excavations such as The Cairns offers us the opportunity to develop an ongoing dialogue and potential collaborations with archaeologists in regards to projects such as YAARP.
This season, in addition to my regular work, I’ve been spending some time conducting aerial photography tests of the site – with some of the YAARP and Cairns team, using the YAARP UAV (aka ‘drone’) – to provide Martin with some up to date aerial photographs of the site, as well as getting some more airtime in prior to our YAARP fieldwork in August.
It’s also been an opportunity to think about ways to visualise a site and landscape, and ways we can then map and model aspects of the landscape digitally (for example using photogrammetry and 3d modelling). I even got the chance to digitally record Jim Bright, an Archaeology Masters student at UHI – aka the on-site ‘digital archaeologist’ – creating a 3d model of him in a similar way to how he himself has been recording the site and artefacts this season.
Between now and next year, I’ll be back in the studio, developing new work – both in traditional and digital media – in response to my time here again at The Cairns. You can keep up to date with my ongoing practice at and on my Facebook Page at
Finally, I’d like to thank Martin and his team for welcoming me to site yet again and making me feel very much part of the ongoing research here at The Cairns.
Rik Hammond

The Cairns Day Eighteen 2017

An image taken from above the broch. With thanks to Rik Hammond

Thank you to the Cairns 2017 team and to director Martin in particular for inviting me up to spend some of the last week here on site!

My last visit was in 2013 and I can’t believe how much has changed – how much more archaeology has been exposed – and especially how wonderful the broch interior looks now that we are beginning to see its wonderfully preserved detail such as the furniture and floor surfaces.

Getting ready to sample the floors in the broch today
Getting ready to sample the floors in the broch

These floors are the main reason for my visit. I’m a geoarchaeologist, which means that I use a range of archaeological science techniques to investigate soils and sediments on site. I’ve come up to The Cairns to hopefully be able to help the team get the maximum possible information out of the vitally important floor deposits that we’re now seeing in various areas of the broch interior. These are easy to see in the images we now have of the broch – a patchwork of bright yellow, orange, black and brown surfaces made up of the detritus of a thousand everyday activities.

I’m using a technique called soil micromorphology to enable us to see this level of detail in a way we can’t using traditional excavation methods. Small blocks of the floor material are carefully removed, using a metal tin in order to avoid disturbance of the deposits. Resin is poured into these blocks and hardened, allowing a microscope slide to be made through the ‘thin section slice’ of the floor deposits.

Jo sampling the broch floor deposits
Jo sampling the broch floor deposits

Under the microscope, we can examine in detail what often proves to be a sequence of many, many more deposits that can be seen with the naked eye. It goes without saying that micromorphology is a powerful tool for understanding how these deposits form and the microscopic information they contain – fuel residues, bone, botanics and other pointers to human activity, as well as a whole range of indicators for environmental conditions on site and how these have changed through time.

With the weather on side, we made a great start today – examining the floors, making a start on sampling, and most important of all, talking strategy for next season. With more and more of this wonderfully preserved detail being exposed every day, there’s no doubt that the floor surfaces at the Cairns are going to be a focus for attention for a long time to come!

Jo McKenzie, Honorary Research Fellow, University of Bradford

The Cairns Day Seventeen 2017

Karoline and Marianne setting up a sampling grid in the broch today
Karoline and Marianne setting up a sample grid in the broch

Fantastic weather at the Cairns site today, some lovely sun and minimal wind, optimal for excavation.

A few good finds today, such as a large iron nail, found in the Southwest corner extension. Samples of the possible ditch have been taken. Many pieces of bone and antler were recovered from the souterrain (Structure F) itself to the great enjoyment of the diggers there.

The large deer antler from the revetment rubble in the SW extension
The large deer antler from the revetment rubble in the SW Extension Trench

Another great moment of the day was the removal of a whole deer antler, broken in several places, from the southwest trench butting the south wall of the Broch. This antler was underneath rubble, along with a couple pieces of vertebrae. Samples have been taken from the trench for study at the university.

Pottery sherds emerging from deposits around the entrance to the well inside the broch
Pottery sherds emerging from deposits around the entrance to the well inside the broch

Inside the Broch, here was quite a lot of pottery found around the entrance to ‘the well’, and the floor is becoming clearer and cleaner every day. The ‘cat’ remains will soon make their appearance, ready for Ingrid Mainland (UHI Archaeology lecturer and faunal remains specialist) to study.

The revetment wall which follows the line of the construction terrace and then swings around to abut the broch outer wallface
The revetment wall which follows the line of the construction terrace and then swings round to the broch outer wall face

Several samples were taken, many pictures were taken, new finds were uncovered and overall it has been a successful day. There are some very happy archaeologists and student archaeologists at the site today.

More antler- this time from the souterrain, with a hole drilled in it
More antler-this time from the souterrain, with a hole drilled in it

We hope that the good weather will continue to hold out for the closing for the site later this week!

Iona Guichot, BA Archaeology Student

The Cairns Day Day Sixteen 2017

The top of the revetment wall emerges in the broch terrace cut
The top of the revetment wall emerges in the broch terrace cut

Today started a little wet and windy but the rain quickly lifted off as we discussed the site and the strategy for the final week on site.

We have a slightly smaller team for this week (although there are still over twenty of us on site, nevertheless) and while we have lots to do and both final recording, and back-fill sessions to undertake, these processes can sometimes work all the more smoothly and efficiently with a compact team.

For the remainder of the digging days this week we will concentrate on the broch interior, finishing the souterrain deposits, and a little more work in the south-west extension.


The little cache of winkle shells immediately under one of the late floor slabs in the broch
The little cache of winkle shells immediately under one of the late floor slabs in the broch


Inside the broch as we began to lift the paving from around the late hearth slab, we found that the deposits beneath are incredibly rich in organics; charcoal, burnt bone, shell fragments and a little fishbone.  This deposit looks very similar, (and just as rich), as some of the upper deposits inside the broch that we have previously excavated in the eastern zone.  It’s actually quite comforting to see these familiar deposits and very much encourages us to think that we are dealing with layers of a similar age across the broch interior.  Moreover, the richness of this deposit will ultimately yield lots of information about the use of the broch, in its latter stages.  Under one of the slabs that was lifted, a very discrete, perfectly preserved cache of peri-winkle shells was revealed directly underneath.  This little group was so discrete and so close to the surface as to encourage the idea that it had been made just before this slab was set down, maybe even as a little foundation deposit under the slab floor.

In the south-west extension work carried on in the terrace cut and we have established that there is indeed a revetment wall, partly lining the cut in the natural, and partly extending out from the cut towards the direction of the broch outer wall itself.  It looks like this revetment may be part of the measures to hold back the natural boulder clay from slumping into the area of the ‘extramural settlement’ or village around the broch.  It may even also turn out to be a wall of one of the village buildings itself.

Tomorrow we’ll be excavating some of the earlier broch floor deposits in the eastern zone of the broch.  We’ll keep you posted as to how that goes and what we find!

Martin Carruthers.

The Cairns Day Fifteen 2017

Visitors are taken on a tour on open day, while in the foreground the team excavated a section of the ditch
Open Day: Visitors are taken on a tour of the site, while in the foreground the team excavate a section of the ditch

Today was our open day on site and we had a very good turn out from the public whom we very much hope enjoyed the many tours that were undertaken of the site.

The presence of lots of visitors always lends the site a slightly festive atmosphere and all of us on site really enjoy interacting with the public and showing off the site and the wonderful artefacts that have been discovered.  Many of us were giving tours and we’d like to thank everyone who came along for making it such a fun and cheerful day.

The tours took many of us into show-and-tell mode on site, nevertheless, archaeological work in many areas of the site progressed unabated.

In Trench Q, Dave and the team have been continuing to reveal wall-tops, related to the village surrounding the broch, although how contemporary these are with the broch at this stage will remain unclear for some time.  Interestingly, the soily deposits that they are excavating are full of antler-working waste.  There are trimmed off-cuts of antler coming out thick and fast.  This waste is probably from making combs, pins, and tools of a variety of types, examples of which we have found from elsewhere on the site.  Also recovered from around here was a small bronze chain-link!

Hanneke excavating in the terrace cut around the broch exterior
Hanneke excavating in the terrace cut around the broch exterior

In the ditch, over in the SW extension, the finds have also been coming thick and fast.  Even though we’re really still in quite high deposits (relative to the likely fuller depth of the ditch), the volume of animal bone, including cattle, sheep, pig, deer, and many others, has been quite amazing, and these have been big chunks of large beasts.  This has included horn cores, other large skull fragments, and deer antler.  The ditch was obviously a receptacle for lots of midden, with large unabraided (freshly broken) pieces of pottery  and stone tools to add to the litany of discarded materials.


The green stained bronze chain link from site today, lifted on a soil block to preserve the object
The green stained bronze chain link, lifted on a soil block to preserve the object.


However, based on other sites of the Scottish Atlantic Iron Age, the placement of specific types of waste within ditches seems to have happened in particular locations around the circumference of enclosures, and this appears to have been governed by ideological schemes that are reflected in the patterning of deposits.  It will therefore be very interesting to compare what types of material we have in our section, over a lateral part of the ditch, with those from other sites, such as the wonderful Mine Howe site excavated in East Mainland, Orkney by UHI Archaeologists a few years ago.

Another lovely little item that came up today was a highly polished cattle tooth.  This has seen some serious modification of one its surfaces in the past, so much so, that all the normal wavy, ‘corrugated’ surface of the tooth has been worn down to a smooth high sheen polish.  This must have been some sort of burnisher. However, it is a wonderfully beautiful little item in its own right.


The late hearth in the western area of the broch
The late hearth in the western area of the broch


Inside the broch, in the western interior, the late hearth has been fully revealed and recorded, ready for lifting early next week.  It will be very interesting to see what lies beneath this, especially as the entire hearth is raised up, mounded above the level of the surrounding flag floor as if it is sitting on top of something more substantial beneath.   I have a suspicion that this might turn out to be an earlier (hopefully well-preserved) hearth.  We’ll keep you informed.  Menwhile, Alex has exposed more of the in situ articulated cat bones ready for lifting and sampling the soil from around the body.  This will happen next week.

The forthcoming week is our last week of the season this year, however if previous seasons are anything to go by there may well yet be a few surprises in store for us and some lovely finds!  Keep checking out our blog for details…

Martin Carruthers.

The Cairns Day Fourteen 2017

Henrik excavating the upper ditch fills
Henrik excavating the upper ditch fills

A quick update from me, Martin. Even though we had a slightly shorter day today, curtailed by the rain in the afternoon, we managed to make good progress and work across all areas of the site was illuminating and very intriguing!

Over in the Southwest extension, the ditch continues to surprise and delight. So far the ditch fills have been rich in pottery, shell-midden, bronze objects, and today seems to have been the day of the animal bone. Masses of animal bones have been coming to light today. These included large portions of cattle skulls, pig skull fragments and lots of other large bones, especially cattle, and red deer.

Just one of the trays of animal bone recovered from the ditch today
Just one of the trays of animal bone recovered from the ditch

Ditches are frequently rich reservoirs of information about day-to-day life as they do seem to have been filled up with the daily detritus, however, they also seem to have been fairly strictly organised in terms of what exactly is allowed to enter them, and at what point in the circumference of the enclosure. This has been seen in the ditches dug at other Iron Age sites, where certain types of animals, or even certain portions of animals, where deposited in certain ponts around the ditch, and ultimately it will be interesting to see if the patterns of deposition seen at The Cairns are in any way similar to those other places. What’s more this animal bone will be very interesting in terms of insights into diet and even affluence.

Antler-working debris from Trench Q
Antler-working debris from Trench Q

Inside the broch itself, the team have been continuing to excavate later occupation deposits (we think dating to around the mid 2nd Century AD). They have been investigating one particular concentration of black, carbon rich soil in the middle of the Western half of the broch. When this black charcoal soil was excavated and packed into sample boxes it revealed a large, heavily cracked and heat affected slab underneath. It looks fairly certain that this has been a big hearth base slab set up late in the use of the broch. Even more intriguingly we think we can see the tip of an edge set, upright stone peeping out from under this big slab, and this may turn out to be part of another even more substantial hearth setting. Maybe there’s a really big lovely formal hearth awaiting us. We’ll find out and let you know over the next couple of days.

The large heat affected haerth base in the broch under excavation today
The large heat affected hearth base in the broch under excavation

Another very interesting discovery in the broch today was made by Alex when he was cleaning over a surface near to the wall-face on the southwest side. The greater part of a cat carcass emerged. This is highly interesting in its own right, however, we have previously found a cat skeleton on site, last season, and it appeared to have been laid out in a formal way to mark the construction of one of our non-broch Iron Age buildings, (Structure B2). Several Orcadian Iron Age sites have yielded evidence for such feline deposition (including Howe, near Stromness), and so we shall have to see if this cat too is part of some kind of ‘structured’, i.e intentional deposit.

Elsewhere on site, the routine work of cleaning back over ashy midden in Trench Q continues to reveal fragments of masonry and other stony features that will surely turn out to be parts of the village surrounding the broch. In the souterrain Mary and Gary have restarted the work of excavating the soils within our underground passageway today, and time will tell what is in them. So far a lot of animal bone has come out of the souterrain and the soils look rich and ashy.

Trench Q before the rain toay
Trench Q before the rain today

Now, finally, a reminder that if you are in Orkney tomorrow (Friday the 30th of June), and you are able to join us then please do come down to site for our main open day of the season. We’ll be hosting guided tours of the structures and features on site, and showing some of the amazing finds from this year’s excavations. Please do join us if you are able. We are on site from 10am, but if you visit between the hours of 11.00am and 3.30pm then you will see the dig in action.

Martin Carruthers, Site Director.

The Cairns Day Thirteen 2017

Newly emerging walls in Trench Q- evidence of the broch village to the north of the site
Newly emerging walls in Trench Q – evidence of the broch village in the north of the site

In the eastern part of the site, in Trench Q.  On the south side of the Trench, excavation of overlying ashy soils and rubble soil has finally begun to reveal a wall that forms part of a structure, likely, a village building outside the broch.

Excavations also continue and in the north side of the Trench Q where a fragment of clay Furnace-lining uncovered today further points to metal working at the site and hints at the potential core of the furnace itself.

The little curved copper alloy object from the ditch in the SW extension
The little, curved copper alloy object from the ditch in the SW extension

In ‘the pit’ immediately to the east of the Broch a large fragment of deer antler was found wedged between the slabs of another new substantial sandstone built wall, and in the Souterrain near the entrance of the Broch, whole animal bones and fragments and antler have been identified.  Inside the Broch itself work continue on the upper habitation layers.  Later in the afternoon, the Broch was cleared of our tools and archaeologists for aerial pictures taken from a drone.

Overview of the broch where work continues on the floor deposits
Overview of the broch where work continues on the floor deposits

Work also continues in the SW trench extension on the Broch exterior and along with the many bone fragments found in the midden material, a small copper alloy object was discovered. The delicate find was carefully removed in a block with the surrounding soil.

Excavating in the SW extension
Excavating in the SW extension

Though dig season is now two thirds of the way complete for 2017, the well in the broch, the remaining habitation deposits, the Souterrain at the Broch entrance, and the structures to the east of the Broch will continue to be worked opening up the opportunity to yield even more information this season.

More new walls in the pit close to the broch entrance
More new walls in the pit close to the broch entrance

Gary Lloyd, BA Archaeology student, UHI