Day 4 Beneath Topsoil, Mosaic Islands

Things have become rather interesting at Chedworth (which is an understated archaeological way of saying..very exciting indeed).

Yesterday Terry visited the Villa and told us that he had assisted Professor Richmond 50 years ago. He had built the kerbs and laid the pink concrete. ‘We only dug where Sir Ian had marked out the walls’ he said, not the islands in between’

That explained it. We didn’t expect to find mosaics. None of the villa plans we had seen had marked any here and the mosaic survey of 2000 didn’t bother looking here, thinking that Sir Ian would have mentioned them… but he didn’t look between the walls.

Kate and Megan cleaning the topsoil off the southern room, perhaps a backfilled plunge pool. Beneath this there were lots of Victorian bits and pieces including an button fastener..and quite a few buttons.

Kate and Megan cleaning the topsoil off the southern room, perhaps a backfilled plunge pool. Beneath this there were lots of Victorian bits and pieces including an button fastener..and quite a few buttons.

Now that the concrete is up, there are five islands (we have lettered them a-e)and so far mosaics have been found on four. Very little survives in the southern room (e). It sticks out into the courtyard and has been described as a ‘tank’ with a drain coming out of it. It may be a plunge bath.. a small bit of mosaic was found by Luke at the threshold but the rest is backfill (Terry says not dug in 1963) and the finds in the top layer included items that may be of 1860s date. One small metal tool was found, possibly Roman but no, it was a Victorian button fastener. Over in the north-west corner of the site (island c) Carol found a very worn coin..Fay saw that it was a ‘bun’ halfpenny and Nancy spotted the date 1867 (3 years after the villa was excavated following discovery).

We've put green plastic where the Roman walls were meant to be to protect the surfaces while we work on the islands of Roman archaeology between. So far we have found areas of mosaic in four of the five islands. In the foreground (island c) Alice has almost taken off the last of the topsoil to reveal a landscape of mosaic fragments.  At the foot of the wooden steps (d) Carol has begun to clean back a much better preserved area,

We’ve put green plastic where the Roman walls were meant to be to protect the surfaces while we work on the islands of Roman archaeology between. So far we have found areas of mosaic in four of the five islands. In the foreground (island c) Alice has almost taken off the last of the topsoil to reveal a landscape of mosaic fragments. At the foot of the wooden steps (d) Carol has begun to clean back a much better preserved area,

Now that the concrete is gone… there is nothing for it but to put aside the mechanical breaker and pickaxe and gently tickle the topsoil with trowel, plastic spatula and fine brush.

In ‘c’, below topsoil are loads of mosaic cubes scattered across the area but against the wall a line of white tessera still in place and we hope for a pattern beneath the scattered tessera when we go deeper tomorrow. This area has the look of an area not excavated in 1864 but we will see.

We haven’t looked in ‘b’ yet but Fay and Jeremy found a red and white design in ‘a’.

But in ‘d’.. in ‘d’… at the foot of the wooden steps, beneath a scatter of gravel thrown down to limit erosion.. where many thousands of feet had crossed,less than an inch higher and oblivious of what lay beneath… a rather nice pattern is beginning to emerge.

Here is where we have got to so far, a red and white broad border with a finer blue frame around a woven style guilloche (I think that's the right spelling) mat. We found something like it in the West Range corridor in 2012.

Here is where we have got to so far, a red and white broad border with a finer blue frame around a woven style guilloche (I think that’s the right spelling) mat. We found something like it in the West Range corridor in 2012.

West Bailey Corfe Day 2 Ben’s Bottle

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Today, Andy brought up the gazebo, bollards and information sign and we broke open the string and 6 inch nails and marked out the two trenches.

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Dry and hot and the ground was hard but Ray soon had a crowd round the information table and Nancy’s National Trust archaeology badges were flying off the shelf. Ben asked if he could help and spent the day with us.

Trenches A and B hoping to pick up the line of the wall.

Trenches A and B hoping to pick up the line of the wall.

We came down onto a limestone rubble layer beneath the topsoil and were excited to find medieval pot fragments but they were mixed with silver paper, bottle tops, a sticking plaster (yuk) and then Ben found a rounded brown shape amongst the stones. It came out whole. There in his hands was a c.1950s SCHWEPPES bottle. Probably one of the 1952 RCHM diggers who had a lemonade and chucked it in the spoil heap as the trench was backfilled. Ben’s dad brought us drinks which were greatly appreciated.

Ben's 62 year old Schweppes bottle.

Ben’s 62 year old Schweppes bottle.

At the end of the day we hit a solid stone and then two more and it seems that we have found the top of the wall we were looking for. We’ll find out tomorrow..

A line of stones in the trench nearest to the camera. It is in line with the 13th century wall so perhaps we have found what we're looking for.

A line of stones in the trench nearest to the camera. It is in line with the 13th century wall so perhaps we have found what we’re looking for.

Remote Sensing in Corfe’s West Bailey

Thomas Bond of Tynham first dug in the West Bailey. Writing in 1883 he said “Some diggings which, by kind permission of the owner, W.R.Bankes Esq. I have recently made within the castle, have brought to light some curious facts, which afford much food for conjecture.” Next to investigate the area were scholars of the Royal Commission on Historical Monuments in 1949-52.

One of the 11th century windows in the West Bailey later blocked by the construction of 13th century curtain wall in King John's reign.

One of the 11th century windows in the West Bailey later blocked by the construction of 13th century curtain wall in King John’s reign.

This year we are reopening one of their trenches and seeing whether the wall that was found over 60 years ago continues north to join the curtain wall. If foundations exist, the footings may be able to act as a foundation for a revetment wall which will even up the slope and limit further erosion

The last few lines of the resistivity survey at the west end of the West Bailey

The last few lines of the resistivity survey at the west end of the West Bailey

The plan of the West Bailey. The area of the geophysical survey today. The site of tomorrow's excavation is at the top of the long black wall pointing to the top of the page. Did it once continue right across the West Bailey.

The plan of the West Bailey. The area of the geophysical survey today. The site of tomorrow’s excavation is at the top of the long black wall pointing to the top of the page. Did it once continue right across the West Bailey.


Our first task was to try to detect the buried walls using geophysics. Both resistivity and magnetometry were used. It’s not a big area.. about 60m long and narrowing from 20m at the east end to less than 10m in the west.

A hot sunny day as we pushed our wheelbarrow loaded with gear up through the potters and weavers of the craftsmen village in the Outer Bailey ..up through the South West Gatehouse and into the West Bailey.

A busy day with lots of interested people from Europe and USA mixed with the Brits asking us about the survey and the Castle’s history. Quite a few student groups led by their guides. We wove backwards and forwards with our machines making the survey but we completed it in good time. We will mark out the trenches tomorrow.

Locked in time

I have started this post many times and put it to one side, as I struggled to find the best explanation of carbon -14 dating!   So here goes!

Rob collecting charcoal on site at Golden Cap

Rob collecting charcoal on site at Golden Cap

Radio carbon 14 is a radioactive isotope and is  a method  to date organic materials like  wood and bone by  measuring the amount of carbon-14 they contain. All living things take in carbon 14 directly or indirectly from the air they breath and the food they eat, it’s all to do with carbon dioxide. The amount of carbon-14 in the air is a small amount but has been more or less at a constant level for thousands of years, adjustments can be made to compensate for the fluctuations in levels. Once an organism dies, it stops taking in carbon-14, and the carbon-14 it contained at the time of death decays at a set rate and the radioactivity of the material decreases. Calculations are made and results are produced at different levels of probability, and depending on the sample can produce a narrow range of dates. (thanks to the help of the  BBC education web site) 

Charcoal under the Bronze age barrow on Golden Cap

Charcoal under the Bronze age barrow on Golden Cap

Charcoal is the most popular sample for dating but burnt grain is even better, due to type of tree the charcoal is from. If it is from an oak tree then the tree may have been hundreds of years old already when the wood was burnt and can produce a wide date range. Grain, even if stored, will only have had a short time to take in the carbon so it will produce a better result.

When collecting a sample you need to make sure you have enough and also to bag it so it doesn;t get contaminated by other samples or other carbon sources. These days techniques are so refined that we do not usually wrap samples in tinfoil as we did in the 1980s, but we still ban smoking in the trenches  for the health of our samples and diggers!

All non smokers on sites were always jealous of smokers as they had more breaks from digging than us!

Charred grain and seeds vollected from soil samples

Charred grain and seeds collected from soil samples

Hopefully this has made som sense, I am not very scientific minded as I lean more to the arts side of archaeology!  We are at the moment waiting for some dates from our excavations at Chedworth, as the six to eight weeks deadline approaches. I will post the results when we have them.

One of the charts showing results from samples from Badbury Rings

One of the charts showing results from samples from Badbury Rings

Burnt grain you can see the details of the grain hull

Burnt grain you can see the details of the grain hull

All packed up and the tents are down

Phew! the grand tour that was the Festival of British Archaeology is over for another year, lots of budding archaeologists with new facts, ideas and plans to dig up their gardens!

I cannot thank all our wonderful volunteers and volunteer archaeology groups enough, without their enthusiasm and energy it would not have been the great success it was. Here are a few pictures to show what we all got up to around the South West, starting at the Wiltshire History Center, then Chedworth, Godolphin, Kingston Lacy, Corfe Castle and A la Ronde.

Close inspection of the environmental sort trays

Close inspection of the environmental sort trays

Mosaics at Chedworth

Mosaics at Chedworth

The Ancient Wessex Network guys melting bronze for casting

The Ancient Wessex Network guys melting bronze for casting

The fire burns to bright!

The fire burns too bright!

Weaving a wrist band, a very popular activity with girls and boys alike

Weaving a wrist band, a very popular activity with girls and boys alike

The finished wrist band

The finished wrist band

Gordon the Victorian scientist

Gordon the Victorian scientist

Dave the Blacksmith

Dave the Blacksmith

Rory the Barber surgeon and his leeches!

Rory the Barber surgeon and his leeches!

'Use the tweezers' good job we have wet wipes!

‘Use the tweezers’ good job we have wet wipes!

An extra visitor at the Godolphin event, a Golden-ringed dragonfly

An extra visitor at the Godolphin event, a Golden-ringed dragonfly

Cream tea for the workers at the end of the event

Cream tea for the workers at the end of the event

Remembering a great archaeologist

I have been distracted this week after the sad  news that Mick Aston (Time Team fame) had passed away, a great academic archaeologist, but most of all a great communicator of archaeology. and a lovely man,  🙂  the following links say it all ………

http://www.bbc.co.uk/news/uk-england-somerset-23056215

http://new.archaeologyuk.org/news/mick-aston-1946-2013

Mick giving out Dorset Archaeological Awards a few years ago. I was collecting Martins award for him

Mick giving out Dorset Archaeological Awards a few years ago. I was collecting Martins award for him