THE INCIDENCE OF OYSTER SHELL IN THE SPRINGHEAD POOL
LITTLEDEAN WATER SHRINE
(c) 10th September 2019 D.M.Macer-Wright
Occasional papers No. 2
Three single oyster shells were found during the 1984 excavation season of the Littledean Roman Temple. These came from a deposit identified as a ritual structured closing fill of the rectangular pool of the Romano British Water Shrine in advance of re development as a major nymphaeum, probably undertaken at the end of the 1st century or early in the 2nd. This deposit was composed of many artefacts spanning a cultural time frame from Neolithic to Roman, bringing together a diverse range of objects of ritual significance. No other complete oyster shells were found from the area of the Roman remains.
The late Professor Barri Jones took numerous clay samples from a section cut through the pool from east to west in August 1985. These samples were stored at Manchester University until 2018 when they were returned to Littledean. The samples remained in their original bags and had not been analysed. The ‘brick hard’ clay samples had a number of small bits of stone in them and many had the smoothed impressions of the 1985 excavation spade cuts. One of the larger samples had a remarkable and astonishing small yellow/green sandstone Celtic head stained with red ochre, which was totally encased within the clay, A CELTIC RED OCHRE STAINED HEAD Littledean Water Shrine Occasional Papers No 1. It is the less visually obvious contents of the clay samples however which provide the interest for this particular paper.
Robin Holley wet sieved several of the clay samples collected by Professor Jones from the “pool section” and produced some very significant findings. Central to his findings is the incidence of oyster shell fragments and dissolved oyster shells which range from c. 10mm x 5mm down to dust. Given the virtual absence of oyster shells from dry contexts around the site, this material is anomalous. The deposit of oyster shell remains in the springhead pool deviates from the normal deposits of oyster shells on Roman and prehistoric sites. Winder is the authority for oysters in the Roman period in Britain. It is clear from the Elm Farm site at Heybridge, Essex – Oysters and Other Marine Shells by Jessica M. Winder that there are no parallels to be drawn for Littledean,
The other material found by Robin in the samples was residue from late iron age metal working. This was suspected as the 1984/85 east/west and north/south pool sections consistently showed iron staining with fragments of rusted iron nodules within the clay and sand sediment sections. Robin isolated small fragments of both oxidised and reduced burnt clay, small pieces of smithing slag, flakes of metal and small grains and nodules of magnetic hammer scale throughout the samples, evidence consistent with quenching red hot metal. Investigation of the samples before preparation for sieving indicated the shell and metal working fragments were spread through the clay and sand sediments of the pool, forming an homogeneous mixture. Three clay samples with a total weight of 5.17 Kg were analysed by Robin. All three produced significant quantities of oyster shell fragments, small pieces of iron/slag or clinker, iron fragments and single small pieces of bronze and bronze slag.
Whilst it is tempting to suggest some ritual explanation for the oyster shell, the evidence for contemporaneity of shell and metal working debris suggests otherwise. A possible explanation which can be put forward as an hypothesis is that the crushed and powdered shell combined with burnt clay, slag and metal flakes, and including the clay and sand deposits, derives from metal working processes. The fact that the metal working residues were deposited in water indicates the primary mechanism for these deposits was quenching.
Direct technologies leading to small flakes of iron and hammer scale would include forge welding/quenching/tempering. In this process smithing techniques have involved and indeed some artisan smithies still do, the mixing of silica sand with calcium carbonate (lime or crushed sea shells) to make a paste which was used as a cleaning flux to coat the metal surfaces to be welded. This would certainly explain the use of oyster shell in this context in order to create lime from the calcium rich shells. The combination of lime and sand produces a flux which drives off the dirt and impurities allowing a sound and greater success for a fault free weld. Chandler Dickinson, an American historical swords maker, has ably demonstrated the practical issues of to flux or not to flux and the benefits of using sand are fundamentally clear. Significantly there are also high levels of silica sand in the Littledean samples, which sand derives from the local quartz conglomerate sandstone and Old Red Sandstone.
Thus those very ingredients locked up in the clay and sand deposits could indeed derive from the use of a flux paste comprising silica sand, oyster shell powder and red clay. For these materials to end up in the pool demands a process whereby blade hardening was being employed to produce superior weaponry. H.Foll is a particular authority on Celtic swords; how they were made, analysis of original artefacts and a thorough knowledge of the classical literature H. Föll (Iron, Steel and Swords script). He demonstrates how cross sections of La Tene and other Celtic period swords have shown that forge welding by ‘piling’ (the building up of layers) was carried out by Celtic smiths since circa 500BC. The evidence for quenching at an early date is not evident however and it would seem this was a development in Celtic metallurgy which came relatively late. That is not to say the technology was unknown more that it was maybe considered unnecessary, until late in the Iron Age when an advantage from finer weaponry became an asset.
The other process which avoided the need for forge welding was differential hardening. The Japanese sword makers in particular used a methodology which included sand derived from grinding sandstones together to release the very fine micaceous sand, to use in the clay paste which was coated around the blades before heating in the forge. This allowed the sword edges to be extra hard and the backs to flex giving the distinctive shape of the Samurai swords. The clay paste could have charcoal powder or soda ash (plant ash) mixed in it. The clay wrapped swords were hardened by quenching followed by heating to temper the blades.
Given the apparent contemporaneity of the metal working evidence and oyster shell in the samples, along with clay and sand, one can postulate that the homogeneous samples contain all the constituent parts that one should expect from forge welding when using the technique of piling and also from differential hardening with release of clay into the water. That is to say in the first the forge welding uses flux whilst in the second differential hardening uses clay. The by/waste products are likely to be hammer scale, metal flakes, slag pieces, reduced and oxidised burnt clay fragments, quartz sand, fine clay sediment and material remains high in calcium, which in this case is oyster shell. All these are present in the clay samples taken from the pool section in 1985.
Amongst the critical artefacts which support any argument for high end weaponry is the significant class of objects known as hones or whetstones. These objects are quite numerous at Littledean as objects placed in the backfills to the late neolithic stone holes or pits after standing stones had been removed. It can be demonstrated that standing stones which surrounded the pool were universally removed during the metal working phase and up to the Romano British period. Amongst the backfills were pieces of iron slag, broken hones/whetstones, grinders and sandstone surfaces with the tell tale signs of grinding wear. Another pit which may have held a wooden tree trunk for an anvil base, had a small skull shaped piece of iron slag in it, placed beside another ochre stained small sandstone head, both in association with a 16 x 16 x 4cm broken Old Red Sandstone slab from a grinding platform, which may have been part of a post pad. The importance of this head is twofold; firstly it was deposited with iron slag, placing it in the late Iron Age metal working phase and secondly the ochre stain places it with the head referred to earlier from the clay deposits. A third small sandstone ochre stained head from pool 4a in an IA context confirms these heads probably all belong to the Iron Age period and one can conclude from the contexts that they all belong to the metal working phase.
Last but not least three of fourteen soil samples (21%) from contexts associated with the springhead pool produced single fragments of bronze, which combined with a good piece of slag and IA pot from the subsidiary water feed to the IA phase of the springhead pool, provide evidence for bronze finishing, eg sword hilts.
The evidence allows for a reasoned conclusion that the incidence of oyster shell throughout the sediments of the springhead pool provides a compelling case for both quenching and differential hardening of iron artefact during the late Iron Age.
LITTLEDEAN ROMAN TEMPLE AND NYMPHAEUM
Welcome to the Littledean Roman Temple. The artistic reconstruction drawn by Mr Anthony Beeson is for illustrative purposes based on the evidence provided by the ground plan of the wall foundations. The scale of the building is a reflection of the width of the foundations which range from 1.2 metres to 1.5 metres, suggesting large scale and height. Architectural remains of column drums and huge building blocks allow an interpretation for classical features. The distribution of flooring tesserae, roof tile, nails, pottery and glass provide compelling evidence for a peristyle courtyard, while the evidence from the water features confirms the open central area was a formal pool fed by piped water from springs, with added special effects of rain water cascading from the roofs, as if curtains of water, during wet periods and thunderstorms.
Academics have struggled with interpretation for years. Was the building a temple or a nymphaeum? An almost complete lack of Roman votive material has been taken to mitigate against a temple interpretation, whilst the certain evidence for a sequence of pools representing evolving phases of a water shrine, provides clear and certain proof for earlier structures which can be identified as fana (shrines or temples). Following a searching analysis of all the evidences it can be seen that with regard to the lack of votive material, although Archaeologists have to pursue evidence based interpretations, the adage “absence of evidence is not evidence of absence” is a sound argument here. The evidence for a formal pool makes the building remarkable and is thoroughly consistent with a nymphaeum, while its western large apse housing a shrine (the aedicula) and flanking wall niches, is architectural treatment thoroughly consistent with a temple.
Clear evidence which indicates significant and indeed major alterations from the later 4th century, probably through into the 5th century and certainly beyond, with a late wooden building in the centre of the structure, is explained as a result of conversion by Christians. It is the argument for a long period of Christian use which explains the lack of votive material, ‘cleansed’ from the building and site.
Thus an academic consensus can now be reached. The Littledean Roman site is indeed a temple, embracing the fundamental sacred element of water from the earliest times, which element was manifest in the Roman mindset through expression as a nymphaeum. The Temple probably embraced three elements, the entrance court as a public place, the nymphaeum court as a functional place and the cella as a restricted sacred place.
The Littledean Temple represents the apotheosis of pagan water worship with origins and a continuity since the Neolithic period. Professor Miranda Aldhouse – Green identifies the site as a Celtic healing water shrine for eye ailments and may have been on an ancient pilgrimage route running between temples such as Lydney. Mr Bryn Walters identifies the Roman temple as a healing water shrine continuing its long Celtic tradition. This remarkable continuity will be described in the pages of this website.