Big, Bad (?) Data: new EngLaId publication

We are very happy to announce the latest EngLaId publication, a joint article by project DPhils Dan Stansbie and Sarah Mallet, in the latest 2015 issue of Medieval Settlement Research. Dan and Sarah discuss identity and landscape in early medieval England through a Big Data-focus on food..

Perfect Christmas reading!

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Past landscapes and communities: EngLaId conference, Sept. 2015

On 23 and 24 September 2015, the EngLaId conference ‘Past Landscapes and Communities’ took place at Keble College, Oxford. Researchers from 7 different European countries attended this two-day event, including specialists in later prehistoric, Roman and early medieval archaeology and history as well as GIS and landscape archaeology. This two-day event was structured around the broad themes of ‘identity’, ‘community’ and ‘landscape’, focusing on specific questions such as:

  • How can we model and visualize the use and history of landscapes in the past using multiple/large datasets?
  • How do material culture, spatial distribution, and landscape lead us to understand past identities?
  • Can we explore community identities and histories in the long term (and across disciplinary period boundaries)?
  • How does the situation in England compare to other regions within Europe?

A twitter feed was maintained for the duration of the entire event by the EngLaId team (see http://storify.com/EngLaID_Oxford/past-landscapes-and-communities). In what follows, the conference highlights are summarised on the basis of a series of photographs taken by EngLaId project artist, Miranda Creswell. At the outset, thanks very much to all participants, speakers, chairs, as well as a HUGE thank you to EngLaId’s Laura Morley for organising a seamless event!

Conference delegates enjoying the sunshine outside the lecture theatre
Conference delegates enjoying the sunshine in the picturesque setting of Keble College

Day 1: Wednesday 23 September 2015

At 9 am on Wednesday, EngLaId project PI Chris Gosden started the day off with the bold statement that he has definitively solved the concept of ‘identity’.

Chris Gosden's 'identity-formula'
Chris Gosden’s ‘identity-formula’

This was followed by the first ‘proper’ session of the day, expertly chaired by David Fontijn (Universiteit Leiden, Netherlands).

The first talk was by Alex Smith from the University of Reading, summarising some of the key findings of the Roman Rural Settlement project in his talk Identity in rural Roman Britain. Some of the results of this excellent Big Data project, bringing together rural settlement data from developer-funded excavations with a focus on portable material culture and agricultural practices, are now available on-line at http://archaeologydataservice.ac.uk/archives/view/romangl/.

Alex Smith discussing Roman cows
Alex Smith discussing Roman cows

The first session of the day was concluded by Mads Holst of Aarhus Universitet (Denmark) in a stimulating and beautifully presented talk entitled Collective manifestations in a herding landscape, which focused on agricultural regimes, the impact of barrow construction and settlement patterns in the later prehistoric landscapes of Jutland.

Mads Holst presenting his paper; David Fontijn chairing
Mads Holst presenting his paper; David Fontijn as chair

After a short coffee break, the day resumed with a three-paper session focusing on GIS methodologies, chaired by Roger Thomas of Historic England.

Mark Gillings from the University of Leicester kicked off with a fascinating talk about the little standing stones (and they really are _very_ little) from Exmoor, SW England, exploring the concept of Geosophical Information Systems in his talk Now you see me, now you don’t? Mapping the fugitive & invisible. Extensive processing time led to some interesting invisibility-viewsheds and the conclusion that we need to reconsider the significance of these stone arrangements.

Mark Gillings describing the _very_ little standing stones on Exmoor
Mark Gillings describing the _very_ little standing stones on Exmoor

After this, team EngLaId presented again, this time a double-act from GIS expert Chris Green and DPhil candidate Victoria Donnelly, entitled Embrace the chaos: structuring affordances and the PPG16 Big Bang. This drew together some of the highlights of their important research into the factors affecting archaeological patterning, such as archaeological investigation patterns and other ‘affordances’ (see previous blogs here and here for Dr Green’s discussion of the concept of ‘affordance’ in this context).

Chris Green and Victoria Donnelly, team EngLaId
Chris Green and Victoria Donnelly, team EngLaId

The final paper in this session was presented by Philip Verhagen from the Vrije Universiteit Amsterdam (Netherlands), presenting joint research with French colleagues Laure Nunninger & Frédérique Bertoncello. His talk was entitled From static distribution maps to dynamic models of occupation: rethinking spatial analysis of Roman rural settlement in France & the Netherlands, and compared different regions in France and the southern Netherlands.

Philip Verhagen in the flow of his presentation on dynamic settlement models in the Netherlands and France
Philip Verhagen in the flow of his presentation on dynamic settlement models in the Netherlands and France
From left to right: Mark Gillings, Victoria Donnelly, Chris Green, Philip Verhagen and Roger Thomas. In the background: Philip's suggestions for further reading on the subject matter of his excellent talk.
Discussion time. From left to right: Mark Gillings, Victoria Donnelly, Chris Green, Philip Verhagen and Roger Thomas

The discussion that followed made it very clear that this was going to be an excellent if exhausting two days (readily admitted by some of the attendees on the twitter feed!), and we retired for a well-deserved spot of lunch in Keble’s impressively huge dining room.

Keble Hall - apparently deliberately designed to be some 10 m longer than Christ Church College Hall..
Keble Hall – apparently deliberately designed to be c. 10 m longer than Christ Church College Hall.. (photograh by Victoria Donnelly)

After lunch, we entered the historical period with a stimulating talk by Grenville Astill from the University of Reading, who questioned existing assumptions about village nucleation and the development of England’s open field system in his talk Medieval fields, farming and villages – the basis of a communal English identity? Taking the bull by the horns, Grenville questioned whether a typical ‘English’ rural identity, focused on the village community, already existed prior to the 12th century AD, or whether the preceding period should be understood as a succession of different identities that eventually crystallised into a more familiar ‘village’ identity. Emphasising the importance of agricultural activity as the basis of human society, Grenville also drew attention to the high number of medieval documented murders that took place in fields in the context of day to day agricultural practices.

Grenvilla Astill on medieval villages and fields
Grenville Astill on medieval villages and fields

This session, which was chaired by Helena Hamerow of the University of Oxford, was followed by Alexandra Chavarría of the Università di Padova (Italy) who, on behalf of herself and Gian Pietro Brogiolo, discussed several impressive large-scale landscape projects carried out in the Colli Eugeni region in northern Italy (see http://www.memolaproject.eu/).

Alexandra Chavarría in the flow of her presentation, with David Fontijn, session chair Helena Hamerow and Chris Gosden on the front row in full attention
Alexandra Chavarría in the flow of her presentation, with David Fontijn, session chair Helena Hamerow, Chris Gosden and Alex Smith on the front row in full attention
Alexandra Chavarría and Grenville Astill during the discussion time
Alexandra Chavarría and Grenville Astill during the discussion time

The final session of the day was chaired by Mark Pollard of the University of Oxford. The first paper was a double act by Johanna Hilpert and Karl Peter Wendt of the Universität zu Köln (Germany), who presented their research (together with Andreas Zimmermann) on modelling population densities in the long term in their paper Patterns of demographic change and land use in sedentary societies.

Johanna Hilpert
Johanna Hilpert locating the study area
Karl Peter Wendt discussing their research
Karl Peter Wendt discussing their research

This was followed by another German talk, entitled Feeding from dense & sparsely populated surroundings – aspects of Early Iron Age communities in southern Germany. In this excellent presentation, Axel Posluschny of the Deutsches Archäologisches Institut talked about his research reconstructing Iron Age hinterlands around so-called Princely Sites (rather spectacular high-status burials) in the south of Germany.

Axel Posluschny debating
Axel Posluschny explaining GIS technologies to reconstruct hinterlands

The session was concluded by EngLaId DPhils Sarah Mallet and Dan Stansbie, who gave an excellent double talk on their research into food. Their talk, entitled Diet and regionality: the case of the (southern) English landscape 1500 BC – AD 1086, drew together some highlights of their doctoral research into animal bone, pottery and stable isotopes as a way to understand changing food practices in England from later prehistory to the early medieval period.

Dan Stansbie and Sarah Mallet introducing their research
Dan Stansbie and Sarah Mallet introducing their research
Saeah M
Sarah Mallet explaining the possible reasons behind some unusually high results from the nitrogen analysis
Dan Stansbie, Karl Peter Wendt and Sarah Mallet during the discussion
Dan Stansbie, Karl Peter Wendt and Sarah Mallet during the discussion

Although it was late in the day, the discussion that followed was animated, with some critical questions posed (and answered!). A few well-deserved drinks in the Lamb and Flag and a nice conference meal in Keble Hall concluded day 1 of this conference.

Day 2: Thursday 24 September 2015

The second day started off with a session on prehistoric landscapes and time in England and the Netherlands, chaired by Sarah Semple of Durham University. The first talk of the day was given by Harry Fokkens of the Universiteit Leiden (Netherlands). In his talk Searching for the past in the present, Harry charted the passage of time in some complex and well-preserved prehistoric settlement evidence that emerged around a Bronze Age barrow in West Frisia (the Netherlands).

Harry Fokkens discussing complex settlement patterns in West Frisia
Harry Fokkens discussing complex settlement patterns in West Frisia

The focus on barrows was continued in the talk by EngLaId’s prehistoric specialist Anwen Cooper, who presented her work on barrow relationships/histories/legacies in her presentation English landscapes from the perspective of Bronze Age barrows, 1500 BC – AD 1086. Some interesting visualisations were showcased, resulting from Anwen’s close collaborations with project colleague Chris Green, allowing for a more productive method of visualising and analysing the various spatial and temporal associations between Bronze Age barrows and other archaeological features.

Anwen
Anwen Cooper showing an interesting graph of the rhythm or tempo of different activities taking place at barrows in the East of England through time
Anwen
Anwen Cooper exlaining an innovative visualisation of barrow relationships (to be made available through the EngLaId website)
Anwen Cooper, Harry Fokkens and Sarah Semple at question time
Anwen Cooper, Harry Fokkens and Sarah Semple at question time

After yet another stimulating discussion and a much-needed coffee break, the day continued with a well-structured session focusing on different aspects of community from prehistory to the 11th century AD, chaired by Richard Bradley of the University of Reading. The first speaker of the day was Melanie Giles from the University of Manchester, who presented her work on the Iron Age ladder settlements of East Yorkshire in her talk entitled Making communities; interpreting the late Iron Age ladder settlements of East Yorkshire. Melanie emphasised the practice-based aspects of landscape, and gave the subject matter a very human face by reminding us of the micro-politics of everyday human interactions, including issues of conflict similar to those Grenville Astill had mentioned the previous day.

Melanie Giles in the flow of her presentation
Melanie Giles in the flow of her presentation

After this, it was back to team EngLaId with a presentation by early medievalist Letty ten Harkel entitled Enclosing space: defining boundaries in England c.1500 BC – AD 1086. Continuing the focus on practice, the aim of this paper was to suggest a holistic and interdisciplinary approach to the concept of enclosure, demonstrating the limitations of relying too heavily on archaeological evidence alone and emphasising the importance of the natural environment as a structuring element.

Letty ten Harkel discussing some graphs
Letty ten Harkel discussing some graphs

Letty finished her talk with an experiment to map the mass of EngLaId data against the hundred boundaries digitised by Stuart Brookes of University College London in a recent project reconstructing the administrative landscape of later Anglo-Saxon England (http://www.ucl.ac.uk/archaeology/research/projects/assembly). Stuart’s talk Polity & locality: unpicking the hundredal geography of Anglo-Saxon England followed seamlessly with a discussion of the data for these various later early medieval territorial divisions, showing the complex interplay between imposed and more organically developed administrative structures in the English landscape.

Stuart Brookes discussing later Anglo-Saxon England's hundredal geography
Stuart Brookes discussing later Anglo-Saxon England’s hundredal geography

At discussion time, the important question was raised whether spatial proximity implies ‘continuity’ or not, reinforcing a point made earlier during the conference, that we tend to understand ‘space’ much better than ‘time’. Much thinking remains to be done in this respect!

From left to right: Melanie Giles, Letty ten Harkel, Stuart Brookes and Richard Bradley during discussion time
From left to right: Melanie Giles, Letty ten Harkel, Stuart Brookes and Richard Bradley during discussion time

The final part of the day started off with a Spanish session, chaired by Gary Lock of the University of Oxford. Moving a little bit outside of the box, Felipe Criado Boado of the Institute of Heritage Sciences, CSIC (Spain) talked about Archaeologiques of space: linking landscape, materiality, perception and social domination (4000-0 BC).
Showcasing some innovative research about the way in which we look at things, Felipe’s discussion was impressively broad-ranging, covering everything from contemporary fashion to prehistoric pottery.

Felipe C
Felipe Criado Boado explaining the sight experiments carried out on test subjects using different images of prehistoric pots

The second paper in this session was presented by Julio Escalona of the Instituto de Historia, CSIC (Spain). His presentation Not quite the same: settlement and community in early medieval Castile analysed the complex interplay between different local and supra-local communities in early medieval Spain, exploring the concept of Dense Local Knowledge (DLK) as a way to understand community structure.

Julio Escalona presenting his research
Julio Escalona presenting his research
Gary Lock leading question time after Julio Escalona's paper
Gary Lock leading question time after Julio Escalona’s paper

The final session of the day was chaired by Zena Kamash of Royal Holloway University (previously EngLaId’s Roman specialist). The first presenter was Dagmar Dreslerová of the Akademie věd České republiky (Czech Republic) who gave a brief overview of landscape archaeology in the Czech Republic, and presented her excellent research (together with Peter Demján) into creating a comprehensive archaeological model for Bohemia, the western half of the Czech Republic.

Dagmar Dreslerová
Dagmar Dreslerová showing the model

The final talk of the day was given by EngLaId’s Roman specialist Tyler Franconi. His talk on Hydrological influence on floodplain settlement in Roman Britain and Germany brough us back to the Roman period, comparing the two river basins of the Thames and the Rhine and the interaction between human and environmental factors.

Tyler Franconi presenting his research
Tyler Franconi presenting his research
Zena Kamash posing questions of Tyler Franconi during discussion time
Zena Kamash posing questions of Tyler Franconi during discussion time
Dagmar Dreslerová and Tyler Franconi during the final questions
Dagmar Dreslerová and Tyler Franconi during the final questions

The day ended with a final discussion by Chris Gosden. Chris admitted that summing up the enormous breadth of ideas and subjects that had been covered was extremely hard, but managed to identify some common ground. Although the papers had traversed different scales, regions and chronologies, the subject matter of pretty much all of them evolved around the relationship between people and the land, emphasising the multi-faceted character of communities.

Chris Gosden summing up
Chris Gosden summing up

The ensuing discussion brought up many points that the EngLaId team will have to think about in the following year during the preparation of the monograph and other project output. These include the interplay between sharp discontinuities and overall broad continuities; the difficulty of understanding ‘time’; the benefits but also challenges of interdisciplinarity; and the problem of scale.

The final discussion
The final discussion

For updates on how our thoughts develop in this respect, watch this space!

Pondering regionality

I have recently been pondering the definition of regions, in the sense of carving England (or any country) up into contiguous zones of particular archaeological character. I would suppose that as a method of archaeological enquiry, this probably goes back at least as far as Fox’s division of Britain into “lowland” and “upland” zones along a dividing line running approximately from Dorset to Yorkshire. As a modern practice, I would suggest that recent interest in defining regions probably arises, at least in part, from the influential work of Roberts and Wrathmell (2000).

The reason why I have especially been thinking about this subject of late is due to the way in which two projects contemporary to our own have gone about structuring their reporting of their results. Their final report currently in press (Rippon et al. 2015), the Fields of Britannia (FoB) project divided the country (in this case being England and Wales) up into a series of regions (made up of groups of bio-geographical pays”). Similarly, the Roman Rural Settlement Project (RRSP) has also divided the country up into their own set of regions based upon the archaeological character of the excavated evidence found within each. Both of these projects based their regions around conglomerations of Natural England’s “Natural Areas“.

1 regions
Regions defined by other projects

If we compare these various regions on a map against the “Settlement Provinces” defined by Roberts and Wrathmell (R&W), we can see that there are broad similarities but also substantial local differences between the various regions (and provinces) defined. Herein lies the major problem with projects defining their own regions for analysis and reporting: it makes cross-comparison between different projects’ results difficult. For example, the Chilterns and the Berkshire Downs both fall within the south east regions of R&W and FoB, but within RRSP’s central zone: as such, can their respective “central” zones truly be compared? The simplest solution to this would be defining regions based upon modern political boundaries or, say, 100x100km grid squares. However, such an approach would result in regions that are archaeologically and bio-geographically irrelevant, which is very far from ideal (and so not recommended here!).

More fundamentally perhaps, I am also not convinced that archaeological remains (and thus, by implication, past human culture) truly lacks variety across such continuous areas of space and changes according to such sharp boundaries. I am sure that all of the researchers involved would agree with me on that and there is no doubt that defining regions helps in formulating ideas / arguments and in reporting results. However, I just wonder if there is a better way to structure our space? Some degree of structure is necessary, or all would be chaos and incomprehensible, but could alternative structures be preferrable?

2 HiLo model
Another experimental model (HiLo)

As an experiment, I constructed a regional model for England, but one that did not result in continuous regions, but rather fractured zones spread across the whole country. This model was based upon a mixed classification of elevation and terrain ruggedness and resulted in three new zones: a coastal zone (which largely seems to accord with former wetland areas), a lowland zone, and a highland zone (which seems to capture every important range of hills in England). These zones can exist in pockets within one another: they are not contiguous. Although not (by design at least) archaeologically relevant, these zones certainly have a degree of bio-geographic meaning. Furthermore, they would be reproducible by other scholars, assuming I publicised their construction method. As a Warwickshire man, I am particularly taken with the result that my county almost looks like a “natural” division of the country!

3 regions vs HiLo
Other regions against HiLo

If we compare these three “HiLo” zones (named for Oxford’s infamous Jamaican inn) against the regions of the other projects we can again see some similarities between the borders of my zones and those of the other projects, but again with substantial local differences. Obviously, if we were to use my HiLo regions for reporting on our project, we would just end up compounding the problem of difficulty of comparison, but the experiment remains of interest.

elev_RandW
Elevation: Roberts and Wrathmell
elev_FoB
Elevation: Fields of Britannia
elev_RRSP
Elevation: Roman Rural Settlement Project
elev_HiLo
Elevation: HiLo

I then tested each set of regions against a series of other datasets: elevation, terrain ruggedness, broad soil types, soil wetness, etc. The graphs above show just the elevation results, but the broad conclusions were similar for all comparisons. Essentially, the FoB and RRSP regions look far more distinct than the R&W provinces. This is hardly surprising as they are of smaller spatial extent: the smaller a sample area, the more distinct from the general “population”/pattern a variable ought to tend to be. This is clearly the case here. However, the HiLo model sits somewhere in between. It only has three zones, but they appear far more clearly differentiated than the R&W provinces. As such, we can conclude that they have greater geographic differentiation, due to their non-contiguous nature, despite being of similarly large extent.

8 regions_thes_all
Regions: archaeological variation (area normalised)
9 regions_thes_pc_all
Regions: archaeological variation (percentage)

As a final test, I then compared each set of regions against our archaeological data, using our coarsest level of thesaurus categories. I did this for each broad time period, but the results shown above are for all EngLaID time periods combined (unspecified prehistoric, Bronze Age, Iron Age, Roman, early medieval). The conclusions, interestingly but perhaps not surprisingly, are very similar to those seen when comparing against the “natural” factors described just above. FoB and RRSP regions look fairly distinct, R&W rather homogeneous (albeit with less dense data in the north west), and HiLo regions are more distinct than R&W but less so than the others. Again, the size of regions remains key (due to the MAUP).

Since undertaking these comparative experiments, I have been reading a recent report by Historic England’s Andrew Lowerre (2015). In the second half of the report, Lowerre uses a mixture of environmental variables alongside Roberts and Wrathmell’s data to define regions using automated clustering techniques. The regions that he produced (across a series of different models), much like my HiLo model, are non-contiguous and possess fuzzy borders. As such, to me at least, they seem much more representative of the data than regions defined manually. I wonder if this type of automated region creation is the way forward if we wish to define regions for our analysis and reporting?

Regions are undoubtedly a useful and intuitive way to divide up space that makes analysis and reporting of results within the context of a project relatively simple and straightforward, both in terms of how a team thinks about their data and in terms of how an audience may digest the same. However, the cross-comparison issue is distinctly problematic when one begins to think beyond the bounds of the results of a single project. We could potentially define a set of regions based on the natural environment that all projects should attempt to use, but we as archaeologists often seem to be naturally inclined to always do our own thing, so I am not sure that would be fruitful. Plus the set of regions defined might not be relevant across multiple time periods.

As such, I do wonder if we ought to avoid the idea of archaeological character regions altogether and just talk about variation in data across space. So long as that data is quantifiable and mappable as continuous fields, then cross-comparison becomes simple: map overlay is after all the most obvious application and strength of GIS, with whole suites of tools and methods dedicated to it.

This post is not intended as a criticism of the methods of other projects, which have undoubtedly proved fruitful and interesting in each case. I just wanted to express why I feel we (as EngLaID) ought to avoid regions in our reporting, especially as a project looking across traditional period boundaries. Others might disagree, but I do feel the cross-comparison issue of bespoke regions is a thorny problem, particularly for those interested in broad syntheses across time and space.

Chris Green

References

Lowerre, A. 2015. Rural Settlement in England: Analysing Environmental Factors and Regional Variation in Historic Rural Settlement Organisation Using Regression and Clustering Technique. Portsmouth: English Heritage. http://research.historicengland.org.uk/redirect.aspx?id=6288

Rippon, S., C. Smart and B. Pears. 2015 (in press). The Fields of Britannia: Continuity and Change in the Late Roman and Early Medieval Landscape. Oxford: Oxford University Press.

Roberts, B. and S. Wrathmell. 2000. An Atlas of Rural Settlement in England. London: English Heritage.

Past Landscapes and Communities: The EngLaID project conference

This is just a short announcement to let people know that we are now able to share details of our project conference. It will be held on 23rd and 24th September at Keble College here in Oxford. The provisional programme for the two days can be found here.

Please contact Laura Morley if you are interested in attending. Places are quite limited, unfortunately, so likely to fill up fast.

More on mapping pottery

Further to my previous post on mapping broad-brush pottery distributions, I was reasonably content with the maps for prehistory and the Roman period (albeit that they had significant shortcomings in terms of temporal currency), but I was not really satisfied with the amount of data I could find for the early medieval period. One particular shortcoming was the lack of data for the earlier half of the period, for which I had been able to discover very little.

After my blogpost, Helena Hamerow found a map in a publication by Catherine Hills which included a map of earlier Anglo-Saxon pottery. A little bit more investigation showed that this was adapted from Myres 1969 (Map 1). As such, it is clearly a very old source, with no evidence included from the massive post-1990 explosion in developer-funded archaeology, but it seems to remain the most complete national map for the period. I therefore digitised the dots in this map and the Blinkhorn (2012) map referenced previously and turned them into density surfaces. With this simple task complete, it felt like my picture was becoming more useful:

em_pot_v2
Blinkhorn, Myres (labelled Hills) and Vince overlaid.

However, the fact that the Myres data is quite so out-of-date suggested we ought to find some more modern proxy for the ceramic evidence. Letty suggested we ask Toby Martin, a British Academy postdoc here at the Institute, if we could use his corpus (2011) of Anglo-Saxon furnished graves (C5th to C6th) as just such a proxy, insofar as she felt that the people buried in such a fashion should also be people who use pottery. Toby was happy to oblige and so I created a model using a density plot of his data in addition to the previously mentioned three sources. Because Toby’s material is not actually ceramics but just being used as a proxy, I gave his data a lower weighting in the model. I did the same for Vince (1993) as his zones are rather too vague in extent for my purposes here. So, essentially, all of the four sources were normalised by their maximum value (so that they varied between 0 and 1), and then combined as follows (in two steps, so I could separate out earlier and later):

(Myres + 0.5 Martin) + (Blinkhorn + 0.5 Vince)

em_pot_v3_all
Combined model inc. Martin in addition.

However, there is one very clear problem with this model and that is that all of the sources used are explicitly “Anglo-Saxon”. In other words, where are the “Britons”? Toby and I did a bit of investigating and found a very interesting PhD thesis by Imogen Wood (2011) which included three maps of Cornish pottery of the early medieval period. This was exactly what I needed to help colour at least one of the none “Anglo-Saxon” parts of the map. Rather nicely, Wood’s first map was largely temporally coincident with Myres and Martin and her second map largely temporally coincident with Blinkhorn and Vince. So, I simply expanded the model as follows (again split into two stages):

(Myres + 0.5 Martin + Wood_early) + (Blinkhorn + 0.5 Vince + Wood_late)

em_pot_v4_all
Final model also including Wood.

The final model is shown above. I also have a couple of maps which split this out into the earlier (C5th-6/7th) and later (C7/8th-9th) parts of the early medieval period, but I feel that the combined model is probably the most robust. Although some of the input data is not perfect due to its age (Myres) or its spatial vagueness (Vince), I feel that is probably the best model we can currently construct for broad brush early medieval pottery presence / absence, at least without putting in substantially more work.

Any thoughts or disagreements are more than welcome, however!

Chris Green

References

Blinkhorn, P. 2012. The Ipswich Ware Project: Ceramics, Trade and Society in Middle Saxon England. Medieval Pottery Research Group Occasional papers.

Martin, Toby F. 2011. Identity and the cruciform brooch in early Anglo-Saxon England: an investigation of style, mortuary context, and use. Unpublished PhD thesis, University of Sheffield.

Myres, J.N.L. 1969. Anglo-Saxon pottery and the settlement of England. Oxford: Clarendon Press.

Vince, A. 1993. “Forms, Functions and Manufacturing Techniques of Late Ninth- and Tenth- Century Wheelthrown Pottery in England and their Origins.” In D. Piton (ed.), Travaux du Groupe de Recherches et D’Etudes sur la Céramique dans le Nord – Pas-de-Calais; Actes du Collque D’Outreau (10 -12 Avril 1992). Numéro hors-série de Nord-Ouest Archéologie, pp.151-64.

Wood, Imogen. 2011. Changing the fabric of life in post-Roman and early medieval Cornwall: an investigation into social change through petrographic analysis. Unpublished PhD thesis: University of Exeter.

Archaeology and the Map: Critique and Practice

This is just a short advertisement for the forthcoming day conference Archaeology and the Map: Critique and Practice. The conference will take place on 23rd May 2015 at the University of Leicester. EngLaID’s Chris Green will be there, talking about his slightly crazy theories on using Heisenberg’s Uncertainty Principle as a guide to good cartographic practice. The other papers all look even better! The conference will be £6 for students and £10 for others.

arch&map