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This is an aggregated collection of entries from archaeology blogs. The list is comprised of blogs from:

  • Past Horizons - written by Maggie and David (BAJR)
  • BAJR - written by David (BAJR)
  • ArchaeoGeek - written by Jo Cook, Information Systems Coordinator, Oxford Archaeology
  • Online Archaeology - written by Steve White
  • Theoretical Structural Archaeology - written by Geoff Carter

If you want to nominate a blog to be included in this aggregated list please get in touch.

Archaeology Blogs
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Blimey, a New Post

So after months of silence, I’m finally putting virtual pen to virtual paper again- Archaeogeek is not dead after all!

I could have written any number of posts over the last few months, on the trials and tribulations of organising a major international conference for one thing- but I think I’ll save those for after the event…

Instead- a couple of things that have caught my eye recently: firstly a fantastic post on the problems of cartography on Pluto in the new Wired MapLab. I confess I’d never thought about the technicalities of defining a coordinate system on anything other than Earth, or even defining which of the two poles on a planet/asteroid is North and which is South. For asteroids, the problem is exacerbated by the fact that their orientation can change dramatically over a short period of time, so it’s impractical to define a coordinate system pegged at the poles- instead you define one based on the direction of spin. Cue the “right-hand-rule” that you probably learnt in Physics at school for defining directions of magnetic forces and such like. There’s lots more detail in the article, but it’s a great read, and it blew my mind (in a good way) thinking about the arbitrary nature of things we take for granted in mapping.

Secondly, a frankly bizarre set of posts from the UKGovOSS blog. This started up in 2009 and has seemingly returned after a long hiatus with a set of posts on (as you’d expect) using Open Source in UK Government. “Yay” I thought, how useful! But what I found was a set of badlywritten, often contradictory posts that could have been written 5 years ago in terms of what they have to say about open source. The more I read these posts, the more something seemed suspicious, and a whois search for the domain shows it has been recently registered in Indonesia! I find the idea of a bunch of bloggers in Indonesia writing blog-posts on the use of Open Source in UK Government almost as mind-blowing as the Pluto Coordinate System problem, but perhaps the guys behind the original website ought to try and claim their domain back…

18 Apr 2015
Theoretical Structural Archaeology
Imaginary woods
Often, when we think about the past, we do so in our imaginations, using the pictures and impressions we have picked from our shared visual culture, we mix the real things we find into a fantasy world.  Envisioning the environment in terms of its familiar topography and plants does not present much of a problem, domestic animals are bits hazier, but most of the things that made up the fabric of life just don’t survive here in our damp climate.  However, even trees in the picture may not be clear, the focus of archaeology is on tools, seldom extending to a consideration of the materials and products that gave them utility and value.  How to discuss, visualise and define things that no longer exists except in the imagination is one central issues of presenting archaeology.

TSA uses “theoretical models” to express the ideas about buildings and structures deduced from the archaeology of their foundations; these are clearly still diagrams and not pictures. Those that tend toward pictorial representation tend to contain deliberate anachronisms; I wish to restrict the amount of information being exchanged, , express doubt, and subvert a believable reality to encourage understanding rather than belief.  TSA is an ongoing process of reverse engineering; there are other ways of approaching the roof SE end of Neolithic longhouses, which I would not want to prejudice without better data. This is part of doing and presenting the maths; with a model progress can be measured, rated, its fit examined and improved.  The same is true for the underlying components, the trees and timber, both have been well studied and can be modelled mathematically, [1]. The scale of some ancient trees, in terms of how tall they might get, is an interesting problem in the detailed modelling structures, which I may return to in a later post.
I have the same data as everybody else, but have found new ways of processing and thinking about it; invariably, progress comes from breaking down existing ideas and images, particularly the latter, since often, they are not helpful and certainly are not real.  New understandings of existing material are about breaking down one’s own ideas and preconceptions; getting people to change their own is a different matter.
Superficial similarities; barking up the wrong trees
There is an inherent conflict between the need to truthfully recreate from what was actually found, and the requirement, expectation, aspiration, or market for presenting a ‘believable reality’ to archaeology’s wider audience; more especially given the technology at our disposal.  While I am deeply suspicious of pictures of the past and their effect, I also think it important to find new ways of thinking about, and, yes, imagining the past.   These pictures of the past are what people appear to want, and might be seen as an end-product; an answer to the question - what was it like?
The hard truth is that archaeology very rarely has much to do with the routine fabric of life, surprisingly little of our culture ever involved digging holes in the ground.
Another recurrent theme is the use of other contemporary or recently documented historical cultures to fill the void in the archaeology of material culture, most notably in architecture. Nobody has seen an Iron Age building, yet we all have a picture of one in our mind; these images of the past, just like a religious painting, can tell us more about contemporary culture than it does about the imaginary object being depicted.  
There is also a point where the perceived need to remove cultural bias from our language, is at variance with the need to fully define a local tradition or technology.  At some level, which it is difficult to define, the use of terms like longhouse, roundhouse, as well as words like henge or circle, implies some relationship where none can exist, except in the most superficial descriptive sense.
Ethnographic parallels; so let’s nail this one from the start; when thinking about prehistoric material in NW Europe, it is not only that the big things like environment, particularly climate,  and culture that is entirely different from areas like Africa, it is also down to the little things like the lack of termites.  This and other trifling issues of geography is just one of reasons there is not generally a tradition of oak framed buildings in Africa.  
In NW Europe timber buildings and products represent a good long-term investment of resources, and formed the basis of a system of mixed farming in a variable temperate climate.  You could argue that the scale and nature of our buildings have reflected the use of oaks up to 50' or even 60', and it is to local trees that we should look for a sense of proportion for our ancient buildings.
While it is self-evident that vernacular architecture is a regional craft, representing one of the most obvious visual manifestations of a local culture, archaeologists find this hard to grasp in their imaginings about the past.  However, there is more to material culture than farm houses, and in the modern world it is easy to forget that wood was once the raw material for the fabrication for significant amounts of material culture.
As new materials have replaced wood, the woodland systems that produced the raw materials along with their craftsmen have also started to vanish from our countryside.  I would like to explore this very local relationship between trees and materials culture by looking at two trees with very different but complimentary contributions to make to our largely lost and unrecorded heritage.
Super woods
The mighty oak and its diminutive sidekick hazel are two of the most important building blocks of our traditional material culture,  only faint traces of which ever come to the attention of archaeologists. While other woods have specialised utility and products, [2],  almost an entire material culture can be fabricated from these two trees using simple tools. In a study of the ancient economy timber resources are easily overlooked; it is only when they run short, and this starts to impact on the archaeological culture, that this becomes apparent; domestic building in stone was only found in those areas without sufficient resources to use wood, such as Neolithic Orkneys.
As a general rule, trees are farmed, grown in woodland to provide the types of product required locally where and when they are needed [3]. There is plenty of evidence from waterlogged sites that this was the case, and the uniformity of postholes in prehistoric structures also bears this out. This is an important aspect of the Neolithic culture, for while the natural forests may be full of trees, finding ones of a suitable species and size, together with the problems of transporting them, makes growing your own the only practical solution.  This minimises the problem of extraction, although, once you cut the branches off, quite large timbers can be dragged or sledded by oxen or horses, and presumably people.  While a virtuous and ideal management cycle would be desirable, significant areas of the environment were deforested during the past; it is doubtful that the Roman Army had concern for woodland management, on the contrary destroying timber resources is a legitimate form of economic warfare.
In a fairly standard woodland system two types of tree such as oak and hazel are grown together, the taller oak trees are the main crop with the smaller shrubbier hazel grown the spaces between and below,[3].  The natural light competition drives the trees upwards, keeping them close and the presence of the smaller, but vigorous hazel also discourages side branches, filling any spaces between the oak standards.  As the trees mature over decades they are thinned with the smaller and substandard trees removed.  Both Oak and hazel can be coppiced to produce multiple stems on the same root system, and this is normal practice with the latter [above left, and right] . In complete contrast to modern monoculture systems, a well-managed traditional woodland, would contain a mix of species and ages with the aim of continuous production of a variety of products.  If your requirement is 7 years old hazel stems, you might have 7 blocks or groups of trees, each a year older in the cycle; it might be convenient to attend to the larger oak trees in an area on a similar rotation. What is neat about woodland management is that forward planning over decades can provide a just in the nick of time system; timber buildings wear out and need replacing on a regular basis, even if that might be measured in centuries, whereas some domestic wooden items might be replaced annually.    

Archaeology, as a study of human culture, is restricted to those artefacts that survive in the soil, which can result in a distinctly myopic view, and, as noted, beyond simple tillage, very little daily activity involves digging holes in the ground.  The differentiation of the past into stone, iron and bronze ages tends to obscure the continuity in the use of wood as the raw material for the fabrication of much of material culture.   Perhaps the significance of these changes in terms of woodworking tools, might only be judged in terms of their effects on the nature of their now invisible timber products. Thus, handsome though some stone tools are, they are probably not as interesting or significant as the products they created; Chippendale’s tools would not be as impressive as his chairs.[above].
In this post I have include links to videos which demonstrates the making of simple timber products; this is best way of illustrating how the properties of these woods suits them for the types products that they traditionally produced, and how a craftsman works with them; [as usual, there is a whole world of traditional woodworking videos to explore on line].
The long-term end product, the main crop of this woodland system was tall, preferably straight oak trees, the best of which were for structural use.  Everywhere we now use steel and concrete beams, or for that matter soft wood components, oak would be used, given the choice. Oak is relatively easy to work when freshly cut, but dries out over the years to become a very hard wood.  Most of what survives from the medieval period in terms of buildings and their contents is oak, reflecting its preferential use or survival, and why it was used.
There are few better structural timbers than English oak, importantly, larger logs can be simply split down the grain using wedges, providing squared beams for construction, boards for floors, and shingles for roofs.  Larger split panels can be used for doors, fittings, and decoration such as panelling.  Splitting Oak at Beamish Museum Here.
Traditional carpentry uses simple joints made by shaping the end of one of a piece into a tenon, then inserted into a corresponding mortise hole cut with a chisel; these are the important bits, how the rest of the component is finished is an issue of resources. Wooden pegs or tree-nails made of oak or similar are inserted into drilled holes help secure joints and hold components together, negating the need for metal fixings.
Making shingles here.
One simple form of roof known as a cruck, it involves splitting a bent tree [right] in half and using the two halfs to create a structure like an arch around which the roof is based; larger trunks can be split into several symmetrical pieces.  This is a type of roof that might be represented archaeologically by a pair of postholes, which is a sobering thought, and perhaps explains why the origin of this type of structure remains obscure.
Note the difference between carpentry tools used for putting together buildings, [below] which differ in scale, range, and refinement from those of a joiner, who might make the fixtures and fittings.
In contrast, hazel is a light and very flexible wood, which will produce multiple long stems when coppiced , their size depending on the period of time between cropping.  These can be used whole or spilt, often multiple times to produce increasingly flexible slivers of wood.     
It provides the wattle panels around which the daub was formed, for both external walls and internal partitions, [woven split oak is also known].  A traditional thatched roof was held together with hazel spars, runners, and pegs. If you are not sure about spars - making spars here.
Super timber
Inside the home, oak is tough durable and looks good, so it is used for furniture making, tables, seating, and storage like chests. It can be cleaved, carved, and turned into utensils, bowls, platters and other types of table wares. It can be shaped into staves for barrels, and be split into thin strips and woven to make containers like spale baskets of interwoven oak lathes or spelks; such containers were also known as slops, swills, and whiskets [4].  
For hazel, its principle utility is its flexibility, it can be woven into wickerwork containers and bent using heat or steam into hoops to strengthen other containers [5].   Almost everything that had to be stored or transported might use barrels or baskets.  
Hazel nuts, cobnut or filbert nuts, [depending on species], are an ancient staple of our diet, but preferably not the acorns produced by mature oak trees which were forage for pigs; their high tannin concentrations make them very bitter. However, this property of the wood might enhance certain products stored in oak, or contribute to food smoked with it.  The durability of the wood for use outside also comes from its high tannic acid content, and its bark, always available as a by-product, was used in tanning leather[6].  Oak posts with rails might be used for a fences and gates; it can be used to line wells, tanks, pits, and for pit props; hazel wickerwork can also be used to stabilise holes like cesspits made in soft ground.
Hazel rods had numerous uses; such as angling [7], making lobster pots, fish and eel traps, [8]they are ideal in horticulture for building frameworks and for plant support. Hurdles, wattle panels made from hazel were a cheap to produce, light, but effective way of creating temporary fences, pens and enclosures particularly for flocks of sheep. Another utility of hazel is that it can be split down into small but very flexible strips for binding [string].
Making Hurdles here.
Both species are common in hedgerows, in addition, large trees like oaks are excellent long term boundary markers and landmarks. Growing and planting such trees is simple, as they can be grown in baskets until suitably mature.  That our antecedents might have dug holes to plant trees is not always uppermost in archaeologists’ minds.
Since the Neolithic both oak and hazel have been used to build pathways, tracks, and later roads which have been preserved in waterlogged ground.   Oak is a good timber for bridges, wharfs and docks; it is ideal for military engineering like ramparts, gates and towers, while hazel wickerwork can produce battlements or mantlets. In transportation, wagons, carts and chariots might use oak in particular components like wheels for strength,[9] and hazel where lightness or flexibility is required. Similarly, oak was the favoured material for framed boats, either planked or skin covered like the currach, while hazel could be used in the construction of smaller craft like coracles,[10].
The ancient world was powered by wood, it provided the fuel for heating, cooking, and industrial processes, both hazel and oak are excellent for firewood; both make good charcoal an essential ingredient in the smelting and working of metals.  In mines fire was used to heat rock which was then cooled rapidly with water to crack it. Wooden wedges can be driven into cracks in rocks, which when soaked in water expand causing a crack to open.
As a footnote to the litany of utility, some of the extraordinary Roman correspondence found locally at Vindolanda was written on slivers of oak, providing an unexpected and colourful insight into an aspect of culture which until 1973 had only existed in theory.
While the contrasting properties of these two trees have served to illustrate the range of uses for wood, other common trees such as ash, willow, yew, box, and beech produced timbers with specific uses, whose utility would be equally worthy of detailed discussion.
The supernatural power of wood
As two of the most prominent and useful trees in the environment, both are woven into religion, superstition, folk law and medicine, with hazel being particularly associated with magic and oak with strength.  It is clear that in past both species were found in sacred groves, very specific places, perhaps remnants of the wild wood with ancient trees, and distinct from the more utilitarian woodlands where people worked. [11]
These mystical associations of trees and wooden objects are too extensive for detailed discussion, although I would like to cite one local example; heating hazel nuts to crack them was used as a form of divination on Halloween – also once known as 'Nut-crack night' in parts of Scotland and Northern England. [12]
Both hazel and oak make good sticks and staffs, but the latter is ideal for those types of stick used for hitting things, bog oak being ideal for a club.  If you like symbolism, consider the shepherds crooks, crosiers, batons, staffs, rods, wands and sceptres as expressions of power or authority; until the last century you could be judicially caned or birched.  Everywhere you look people in power and their servants had sticks and staffs of some kind
Hazel rods are used for dowsing, wands can symbolise wisdom, power, misdirection, and magic[13], which is difficult to reference and dangerously like New Archaeology, [14]; luckily, in classical Greco-Roman mythology, the god Hermes/Mercury has a special wand called a caduceus, so we are on safer ground.
One further use of hazel rods that might be easily overlooked was as tally sticks; until 1724, and even as late as 1826, information about the fiscal relationship between the state and the individual could be recorded by notches on a hazel rod that was split into 2 halves, each party keeping one half as an official receipt. It was  a simple, cheap, fool proof system for a preliterate age, and virtually invisible to archaeology.
It was the burning of these now redundant tally sticks in 1834 that caused the fire that destroyed the ancient Palace of Westminster.  [ above; Turner - The Burning of the Houses of Lords and Commons October 16 1834]. It was rebuilt in the gothic splendour we know today, although we tend to picture the stone exterior rather than the timber interior [right; pre- war]; which I suspect is quite common when envisioning famous buildings.  In succeeding where Guy Fawkes failed, the tally sticks demonstrated why so little of the wooden past remains, and why it has been replaced in other materials.
This fine oak chair was carved in 1297 by a craftsman known as Master Walter, it was an expensive piece which cost the king 100 shillings; it is known as the King Edwards Chair.  Although it has lost much of its original gilt and paint, got tarted up a bit in later years, it remains the Throne of England on which [almost] every monarch has had to sit at the coronation.  This remarkable piece of quasi-magical furniture, was also built to contain the Stone of Destiny previously used to sanctify Scottish kingship.  After over seven hundred years old, is still at the centre of the confirmation of power, which explains why it was not thrown away; luckily, it was made of oak. 
Would they have known?
Most of aspects of oak and hazel culture discussed have archaeological examples, but they are exceptionally rare, while soil, or dirt as my colleges might call it, is abundant.   What archaeologists find; postholes and stake holes, some pits, trenches, even graves to some extent, are holes in the ground, that have to do with the practical, utilitarian, or engineering use of timber.
The further we go back into the past the less reliable the historical record becomes, the details of material and social things have been lost, so we might get the impression of an technological ground zero from which the familiar aspects of life all  emerge  as “Roman” or “medieval”.  Clearly, it only from these periods that images of the past have any empirical basis, so it is largely imagination for the prehistorians.  
Try telling fellow archaeologists that Pre-Roman buildings had stairs, floors, even doors, [or worst of all windows], and you will get a very odd reaction; challenging peoples imaginary worlds is just that, a challenge. 
To return to another familiar line, a more fundamental hurdle in the path of understanding can be what we choose to call something, since this must exert a powerful primary call on the visual imagination.  In a recent post I explained why the “Turf Wall” section of Hadrian’s Wall was not made of turf but had been made from timber; in a nutshell it goes like this;
Turf is a mixture of organic and mineral materials; the characteristic “Turf Wall” deposit does not contain the range of mineral particle sizes typical of the local soil, only mostly very fine material, but with charcoal, the traces of fire moss, [Ceratodon purpureus], that grows on dead wood, and pollen samples that are dominated by trees; therefore it could not derive from turf; however, the evidence is consistent with it being the remains of a timber fortification;[QED, etc. here].
It is a very simple and basic observation, which despite having science and historical precedence behind it, is unlikely to convince anyone that something called the “Turf” Wall was made of wood; it is not just the pictures on people’s minds, but also the words we use to describe and name things that do the damage.
The extent to which thinking or more specifically, interpretation of the evidence and understanding is influenced by this imaginary world is difficult to measure.  Even the words like “Prehistoric” seems prejudicial, bending seamlessly into cave men and prehistoric monsters territory. Archaeology is in part a faith based study, with a largely imaginary shared visual culture depicting our past, which I have argued, may serve as block to the understanding of the evidence we find, particularly those ideas and images borrowed from other cultures far away.  
The distant past to some extent is a blank canvas onto which ideas can be projected, often by those seeking  legitimacy and authority in the present. Similarly, aspects of modern archaeology involve the study of what archaeologists don’t find, largely driven by the projection of ideas drawn from contemporary anthropology into the minds of our antecedents, but along with our learning, goes our own ignorance of traditional native culture material culture.  As a result, even relatively straightforward timber structures and products are seen as beyond the abilities of prehistoric peoples.
The truth in archaeology is often hidden in plain sight – the one place archaeologists may forget to look.

"The truth may be out there, but the lies are inside your head." 

Terry Pratchett 1948 - 2015

Picture Credits
Chippendale chair
Woodworking tools;
Author: Peter C. Welsh Release Date: November 12, 2008 [EBook #27238]
Figure 3.—1703: The tools of the joiner illustrated by Moxon
Figure 4.—1703: Only the principal tools used in carpentry are listed by Moxon
Citing Joseph Moxon, Mechanick Exercises ..., 3rd ed., London, 1703. Library of Congress.
Turner - The Burning of the Houses of Lords and Commons
Old [pre-war] Commons interior;

Sources and further reading
[2] Kay N.W. [ed]. 1946. The Practical carpenter and Joiner Illustrated. Odhams Press
Bramwell, M., [ed]. 1982. The international book of wood. London.
[3]  Rackham, O, 1986. The ancient woodland of England: the woods of south-east Essex.
Hanson, C.,O. 1934. Forestry for Woodmen. Oxord press
[4] Jenkins J G, 1978, Traditional country craftsmen, Routledge & Kegan Paul.  p 53
[5].Op. cit. pp30-32
[8] Arnold J, 1968. The Shell book of country crafts. Baker, London. 329-330
[9] Jenkins J G, 1978, Traditional country craftsmen, Routledge & Kegan Paul.  p 110.
[10] Arnold J, 1968. The Shell book of country crafts. Baker, London. 222
[11]. See; Porteous, A.,  1928, The Lore of the Forest, London, p 44
[Cosimo Classics Mythology and Folklore- 1996 – Random house
[12] Op. cit.262
[13] Op. cit.266
[14] Folk belief about Hazel and other trees discussed here;

13 Mar 2015
Past Horizons
British archaeologists fight with Italian farmer to save ancient aqueduct
In January father and son team Edward and Michael O’Neill discovered the headwaters of the aqueduct, which was built by the Emperor Trajan, hidden beneath a crumbling 13th century church north of Rome. A sophisticated example of Roman hydraulic engineering, the aqueduct, known as the Aqua Traiana, was inaugurated in 109AD and carried fresh water […]
06 Jun 2010
All change!
As you may have noticed, BAJR Blogging has remained unloved since December. This is because of the shiney new BAJR Federation site… http://www.bajrfed.co.uk get along there and enjoy…  with news, galleries and forum to keep you up to date and … Continue reading
09 Feb 2010
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