Monthly Archives: April 2019

Processing of soil samples

Searching for charcoal in the processed samples

During the fieldwork investigations some 3,190 bulk soil samples were recovered from archaeological contexts. Processing and analysis of these samples will recover small artefacts as well as plant remains (charcoal, seeds, pollen, including insect remains and possibly land snails etc). Identification of the plant remains may provide information on the types of crops grown and the local vegetation history and environment. This analysis will also provide information on available organic resources for each period, as well as providing material suitable for radiocarbon dating. The work will also contribute to our understanding of how the wider climate and the local environment have changed over the past seven millennia.

Separation of the carbonised vegetation from the processed samples

In addition to the samples recovered from the individual archaeological contexts, a further 2472 samples were recovered as part of the artefact sampling strategy during the excavation of the Mesolithic site. Processing and analysis of these samples will contribute to the understanding of how the knapping site, for example, was used through time.

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Initiation of post-excavation works

Following the preparation of the interim report, a Post-Excavation Research Design was prepared that lays out the key questions we hope to answer and which identifies the various types of specialist analysis required to answer these questions.

The main objective of the post-excavation work is to extract the full extent of information and provide as much knowledge as possible from the material recovered from the excavation phase. This new information will be assessed in line with current research objectives and will result in the creation of a permanent record within the public domain, of all the archaeology encountered along the route of the A75 Dunragit Bypass.

This is no easy task as an enormous amount of archaeological material and information spanning some 7000 years of prehistory was recovered. The team of GUARD Archaeologists and various specialists will work closely with an academic expert from the University of Glasgow in accordance with the research goals of this project and the Scottish Archaeological Research Framework

The aims of the Dunragit post-excavation research are to understand:

  • the relevance of the site to the understanding of the earliest settlement in the south-west of Scotland;
  • the relevance of the site to the understanding of the belief systems in the south-west of Scotland;
  • the natural landscape around the site and environmental and man-made changes that took place within it; and
  • how environmental factors have affected the location and viability of settlement across the area.

We are excited to announce that post-excavation work began in October 2018.

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Emergency conservation work of artefacts

Decorated Food Vessel in situ at East Challoch Farm

Due to the fragile nature of some of the artefacts recovered from the Dunragit sites, specialist conservation was undertaken. These included a ceramic vessel, originally block-lifted on-site from a late Neolithic/Early Bronze Age cemetery at East Challoch, which was then excavated and re-assembled.

Food vessel from burial from East Challoch Farm

A Romano-British copper alloy pin recovered from the Iron Age settlement at Myrtle Cottage was cleaned and stabilised. But the most significant artefacts to be recovered were 167 pieces of jet again from the Neolithic/Early Bronze cemetery at East Challoch, which appear to represent two necklaces. In the case of one of the burials, a matching bracelet was found. Additionally, the two separate graves each contained a ceramic vessel and a worked flint tool. The jet was conserved as a precaution to consolidate the material, to reduce the risk of further deterioration, and to facilitate preliminary analysis.

Jet necklace from East Challoch Farm wrapped
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Summary of fieldwork results

Excavation of the Iron Age settlement at Myrtle Cottage

The archaeology discovered during these works represents a rich prehistoric occupation of this area of the Dumfries and Galloway coastline over some eight millennia. Among the findings were Mesolithic and Neolithic structures, a Bronze Age funerary complex including urn cremations and grave goods such as jet beads and flint tools and an extensive unenclosed Iron Age settlement. It is important to realise that the archaeological excavations at Dunragit predominantly gathered tangible archaeological evidence. This evidence needs to be analysed to make sense of what the archaeological remains mean. So the archaeological fieldwork is just the beginning of a long process of investigation.

Once all of the archaeological fieldwork had been completed, the GUARD archaeologists prepared an interim report. This is termed a Data Structure Report and provides the initial results of the fieldwork. The main purpose of this report is to provide a record of the archaeological features that have been excavated, showing where these features are and offering preliminary interpretation. The Dunragit excavation interim report is important for the subsequent specialist analyses of the finds because it shows the archaeological context from which each artefact was recovered.

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Excavations during construction phase of the bypass

The construction phase involved a team of GUARD Archaeologists monitoring the topsoil stripping and dealing with any archaeology as it was encountered. Following on from the 11 areas expanded earlier, and using the findings from the evaluation to highlight areas of greater archaeological potential, the construction phase revealed further archaeology extending outwith each key area.

West Challoch Mesolithic site being excavated and sampled using a 0.5m grid

For example, the removal of topsoil to the south and west of the original Mesolithic site revealed a continuation of Mesolithic features, including further structural remains, bringing the total potential house structures to three. Employing a grid system across the area, lithic artefacts were recovered in layers and their distribution mapped. Significant quantities of lithic material were recovered – over 13,500 pieces not including the material recovered from the first house.

Jet bead Jewellery from East Challoch Farm Neolithic early Bronze Age site

Further Neolithic archaeology was uncovered in proximity to the East Challoch site and dates to the Beaker period (c. 2500 BC) burial contexts were encountered with finds such as Jet bead jewellery, Beaker pottery and flint artefacts.

A ring barrow on the Bronze Age Cemetery Complex at Boreland Cottage Upper

In proximity to the Boreland Cottage Upper site, further Bronze Age cremations and related features were uncovered. The expansion of the Iron Age site at Myrtle Cottage revealed a kiln and other features related to the Iron Age settlement site.

Kiln structure at Myrtle Cottage
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Excavation of 11 key areas

The Bronze Age Cemetery complex at Boreland Cottage Upper

The eleven key areas of archaeological significance comprised a range of Mesolithic (8000-4000 BC), Neolithic (4000 – 2400 BC), Bronze Age (2400 – 700 BC) and Iron Age (700 BC – AD 500) findings.

Distribution map of 11 key sites along Dunragit Bypass route
The Mesolithic Site 7 at West Challoch under investigation

One of the most interesting results from this phase of work was a Mesolithic settlement revealed at West Challoch to the south-east of Dunragit village. Mesolithic settlements in south-west Scotland are extremely rare and up until our excavations, have consisted solely of scatters of lithic material and hearths but no actual structures. However, a Mesolithic circular structure and associated large pits and ditch gully were encountered during the initial Dunragit evaluation along with a total of 166 fragments of un-stratified lithic material from the topsoil. The Mesolithic house consisted of a sub-circular arc of six post-holes on the south west, with the possible return on the north-east comprising of two post-holes. The area within the structure appeared to be approximately 3 m in diameter creating an internal space of approximately 7 m². The post-holes appeared to be set in four pairs with each pair of posts set approximately 0.4 m apart.

The stone adze recovered from the Mesolithic site at West Challoch

No obvious sign of an occupation layer survived within the interior of the house but a series of sampling grids were laid across its footprint to extract lithic artefacts. Furthermore, two layers of multi-element samples were taken at 0.2 m intervals in the attempt to establish evidence of occupation and differential uses within the structure. No internal hearth was visible within the structure, with the only direct evidence of a hearth a few metres to the north-west. An accumulation of worked lithic and debitage was noted around the north side of the structure concentrated around two of the post-holes. One of the most striking artefacts recovered was a perforated stone adze.of the structure concentrated around two of the post-holes. One of the most striking artefacts recovered was a perforated stone adze.

A series of four preliminary dates were obtained during the excavation for four separate deposits including one posthole, a pit and two layers from the hearth. The calibrated radiocarbon dates ranged between 7056-6825 BC, 6830-6643 BC, 6867-6696 BC and 6849-6656 BC. These demonstrate that this Mesolithic structure is the earliest house discovered in south-west Scotland to date.

The Iron Age structures at Myrtle Cottage under investigation

But that wasn’t all, the other areas revealed a wealth of other prehistoric activity, including possible Neolithic structures (East Challoch), a Bronze Age cemetery complex (Boreland Cottage Upper), a series of burnt mound sites (Boreland Cottage Lower) and an Iron Age settlement (Myrtle Cottage).

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