Allan Bank, Grasmere – Garden Survey Report

The house at Allan Bank, Grasmere, under renovation in January 2012

The house at Allan Bank, Grasmere, under renovation in January 2012

The historic garden survey report we completed in 2012 for Allan Bank, a National Trust property (and brief residence of William Wordsworth) located at Grasmere, Cumbria is now available online via the OA Library. This project recorded all the archaeological and historical features within the c 4.6 hectare gardens on the property in order to inform the future management of the estate. The work was completed in advance of remedial works to be undertaken before the gardens were opened to the public.

Allan Bank, Grasmere in 1861

Allan Bank, Grasmere in 1861

Deeds record the sale of the land at Allan Bank located above the head of Grasmere by a Mr Sawyer to a Mr Edward Partridge in 1756. In 1804 Mr Partridge, or his descendants, sold the property to John Gregory Crump, an attorney and merchant of Liverpool. Subsequently, a villa was built at Allan Bank between 1805-8 in a simple Classical style, and was positioned on the southern flank of a rocky shoulder dividing Easedale from the main Vale of Grasmere. The house was raised artificially to create the depth for cellars and it was orientated so that the main south front looked straight down the length of Grasmere. A few years later William Wordsworth and his family moved there as soon as it was completed as it’s first occupants between May 1808 and May 1811; and their literary friends Thomas de Quincey and Samuel Taylor Coleridge stayed with them for lengthy visits.  He did not like living there, but needed to move to more ample accommodation than their previous dwelling at Dove Cottage. Their occupation of the property was short-lived, in part, due to complaints about smoky chimneys.

Stone tunnel at Allan Bank, Grasmere

Stone tunnel at Allan Bank, Grasmere

Stone viewing seat at Allan Bank, Grasmere

Stone viewing seat at Allan Bank, Grasmere

The extant remains comprise three separate garden areas: a large wilderness garden; a walled kitchen garden; and formal gardens adjacent to the house. The survey identified, and recorded, a total of 109 archaeological features and/or garden components.  Elements in the wilderness garden consist of a series of sinuous pathways with rustic flights of steps constructed of stone slabs. There are four/five garden seats located at strategic spots within the garden which variously had panoramic views looking north-west onto Helm Crag, south-east to Grasmere lake and east towards the house, although many of these vistas are now obscured with mature trees. Water was managed in the garden, with a reservoir that probably served the house and an underground pipe followed the footpath towards the house and ran through an elaborate stone-vaulted tunnel. Streams have been canalised and one stream passes over a craggy waterfall and has a small pool beneath. There is also a small well within rustic stone retaining walls. Features pre-dating the construction of the wilderness garden include charcoal burning platforms and two sections of relict boundary walls.

Plan of Allan Bank gardens, Grasmere – south

Plan of Allan Bank gardens, Grasmere – south

The kitchen garden has a large slate-topped unheated fruit wall on the northern side, which would have masked the garden from the house. The garden was laid out into quarters by slate-edged pathways and in the centre are the remains of a stone circular structure that may have functioned as a formal focal platform. There is a slate-roofed garden shed, a ruined twentieth century greenhouse, water troughs, a compost heap and a French drain that drained water away from the waterfall in the wilderness garden.

Plan of Allan Bank gardens, Grasmere - house area

Plan of Allan Bank gardens, Grasmere – house area

The formal pleasure gardens form a discrete area running around the house and extend to the kitchen garden; its elements consist of driveways, a dwarf-kitchen garden terrace, containing rectangular flowerbeds, and a sundial. The west, south and east sides of the house have stone-lined flowerbeds and stone-hewn flower boxes. On the west side of the house is a small garden lawn with relict beds/pathways evident. It is enclosed on the west side by a sinuous retaining wall constructed of cyclopean boulders and there is a large rockery constructed of quartz stones. Land to the south of the garden has been landscaped/terraced but its function is unclear. The formal gardens are skirted on the west side by a curvilinear gravelled trackway that runs towards the kitchen garden.

Rock art panel at Allan Bank, Grasmere

Rock art panel at Allan Bank, Grasmere

To the east of the house is a gravelled drive adjacent to the main house entrance, grass-covered tennis courts and a stone outcrop with rock art motifs. On the north side of the house there are the remains of two external buildings, an elaborately decorated chapel or billiard room and the ruins of a small garage or coach house.

Excavation of a Viking-Age Cemetery at Cumwhitton

I thoroughly recommend purchasing this book, as it is a great piece of work by OA North on what is one of the most important Viking sites to come up in Britain over the last few years.

Heritage Calling

Little did Peter Adams know, when he pulled a metal object from the ground in 2004, that he had made one of the most exciting discoveries in Viking-age archaeology in England for many years. He had been metal-detecting, with permission, on farmland to the west of the quiet village of Cumwhitton in the Eden Valley and, until then, it had been a fruitless search.

The object was reported to the Portable Antiquities Scheme and proved to be a brooch that was identified as a rare Viking oval brooch of ninth – or tenth – century date. These are mostly found in pairs and in a burial context. He therefore returned to the site and did, indeed, find a second brooch.

One of the oval brooches found by Peter Adams. © Oxford Archaeology Ltd One of the oval brooches found by Peter Adams. © Oxford Archaeology Ltd

The Portable Antiquities Scheme commissioned Oxford Archaeology North to investigate the site as it was under immediate…

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All done at Blelham Tarn, so many many thanks to everyone who helped out

All done and trenches backfilled

All done and trenches backfilled

Friday was the final day out on site at the bloomery at Blelham Tarn so we finished backfilling and reinstating the trenches as well as doing the last bit of survey and drawing up of the earthworks. A massive thanks should go to all of the volunteers who have given their time to come out and explore the four bloomeries around Windermere. Thanks should also go to Jamie, Wilm and Andy at OA North, Ian at EAS Ltd, Jamie and the field rangers at the National Trust and John, Eleanor and Holly at the National Park for giving their professional guidance on site.

We will now try to get some interim descriptions of what we found in each of the trenches on this site, and then as the analysis of the results takes place we will keep you informed of what we have learned, in particular what dates come back from any radiocarbon samples.

Octacopter UAV survey at Blelham Tarn bloomery, Windermere

Aerial plan view of Blelham Tarn bloomery

Aerial plan view of Blelham Tarn bloomery

Jamie returned to Blelham Tarn last weekend to undertake aerial survey on the site of the bloomery as no excavation was taking place. He used his octocopter, one of two  UAV we have at the company, to take multiple vertical images across the site. The north-western half of the site was covered in trees but the main area of the bloomery mound/platform where the four trenches were opened up was surveyed in full. From the photographs taken we were able to process them in Agisoft to create three outputs which will be really useful in trying to get an understanding of the subtle topography and earthworks for this site. First we have a flattened aerial plan view of the visible parts of the site which can be overlain on the survey data I took last week.

An oblique view of the 3D model of Blelham Tarn bloomery

An oblique view of the 3D model of Blelham Tarn bloomery

Then we have the 3D contour model of the detailed topography of the site which we can spin around, zoom in and out of, and pick up fine detail from. The screenshot above shows the model with the photo layer draped on, the one below shows it as the solid 3D generated model. Again from these we can pick up subtle details of the site and surrounding topography, and also see the trenches, spoil heaps and turf stacks!

An oblique view of the solid 3D model of Blelham Tarn bloomery

An oblique view of the solid 3D model of Blelham Tarn bloomery

Finally we can create close contours from the 3D model (these here are at 10cm intervals) which are overlain on the rough survey data we took last week – open the image below and zoom it to have a look. We found that the contours were very detailed for this particular site and were (obviously) better than ones generated from LiDAR data for the region, which at 1m accuracy really didn’t show much of the earthworks themselves, and were also offset slightly from the survey data. We have found that the Agisoft contours are better at depicting earthworks of discrete complex sites, whereas the LiDAR contours at 1m resolution are fine for broader areas and showing the surrounding natural topography.

Rough survey data of Blelham Tarn bloomery overlain with 10cm contours created in Agisoft

Rough survey data of Blelham Tarn bloomery overlain with 10cm contours created in Agisoft

I will use all of this information tomorrow when we go back out to site with the volunteers to finish off and do annotated hatchure drawings of the bloomery.

 

Is it very nearly time for my holidays?

It’s that time of year again when I get itchy feet and want to be on holiday already. I though I would share some images of our Tuscan trip from 2008, back when we could afford foreign holidays!

Bring out the flags! – Topographic survey at Blelham Tarn bloomery

Bloomery excavation and survey at Blelham Tarn, Windermere

Bloomery excavation and survey at Blelham Tarn, Windermere

As the excavations have got underway and continued in earnest this week at Blelham Tarn, I have been there for several days in both sunshine and occasional heavy downpours undertaking detailed topographic survey of the site. When the survey is eventually drawn up it will complement both the excavations and geophysical survey results and will give us a really detailed picture of this complicated site.

Rough survey data and contours for the bloomery at Blelham Tarn, Windermere

Rough survey data and contours for the bloomery at Blelham Tarn, Windermere

Two days were spent investigating the field containing the bloomery mound(s), using survey flags to differentiate the edges of breaks of slope to each earthwork, and then recording them using either theodolite or total station. The rough survey data has been overlain onto contour data at 10cm intervals that was created using LiDAR data, in order to give the general natural topography surrounding the site. One day was spent recording a large dammed pond and water channel located on the hillside above the bloomery and a further day was spent doing basic walkover survey to identify sites in the wider landscape surrounding the bloomery field.

Surveying at Blelham Tarn bloomery, Windermere

Surveying at Blelham Tarn bloomery, Windermere

The rough survey results still need to be drawn up in the field to create detailed hatchured plans of the archaeological features. Initial results have revealed that the core of the site consists of a small sub-rectangular building platform with a flattened slag mound to the west. The gap between these mounds is a relatively flat platform and would have been used as a working area, and it contains the two furnaces identified during the geophysical survey (location of magnetometry grid shown in orange). The first excavation trench (open trenches shown in pink) is located on the inner edge of this building platform and is set across a wheel pit that would have once held at least one water wheel to be used to power the bellows on one of the two furnaces.

There is a flat triangular working area located south of the bloomery which extends out into a bog. There is slight earthwork evidence for small dumps of slag/spoil on the area, and possibly the eastern edge of some type of building foundation (shown in the geophysics results). Two trenches will be opened in this area to investigate these features, as well as another trench which has been opened to record the tailrace running away from the wheel pit. There is no surface evidence for the tailrace as it was infilled with slag, although this is picked out beautifully on the geophysics results.

Upslope to the north of the bloomery there is a slight gully or remnants of a field boundary (not a headrace to the wheelpit) which has a further small slag heap set against it.  On the steep slope above the site there is a large dammed pond with an overflow channel on the west side. It is probable that the pond was once used to power the waterwheel at the bloomery site but there is no direct evidence for this. The pond was heavily modified with a new dam in the Victorian era when it was used for hunting purposes.

Rough survey data for the bloomery and reservoir dam at Blelham Tarn, Windermere

Rough survey data for the bloomery and reservoir dam at Blelham Tarn, Windermere

Initial geophysics results from three of the bloomery sites investigated around Windermere

Colour generated magnetometry plot of High Stott Park bloomery

Colour generated magnetometry plot of High Stott Park bloomery

Here are the initial survey results for the first three bloomery sites to be investigated by us around Windermere. The surveys were undertaken by volunteers who were given enthusiastic supervision by Ian Brooks from Engineering Archaeological Services Ltd.

High Stott Park bloomery had very little earthwork evidence at ground level and the test pitting had revealed slag deposits spread across the field. The magnetomery plot and coloured plot (north to the right) show at least one furnace site on the top left (SW) corner, which on the ground was adjacent to a mossy area of slag deposit. The furnace is shown on the colour plot as an extreme dipolar anomaly (small red blob with dark blue around it). On the right hand side of the plot (NW) there are other anomalies and a messy spread of background noise. It is probable that the bloomery slag mound survives best on this side of the site but the whole earthwork mound was levelled at some point, probably during landscaping of the wider grounds of the nearby farm. There is an edge to the spread slag material shown on the SE corner of the black and white plot and also a linear feature running roughly NNW/SSE.

Magnetometry plot of High Stott Park bloomery

Magnetometry plot of High Stott Park bloomery

The magnetometry at Cinder Nab (north roughly to top) picked up one definite furnace site, which was located on the SW edge of the well-defined earthworks of the slag mound. The dipolar anomaly for the furnace is shown with a black arrow on it. The rest of the material adjacent to is consists of readings from the slag mound itself. Other things to note are the background noise on the left (West) of the colour plot coming from the fence surrounding the tennis courts, and also the complete lack of results from the putative later kiln which was seen as an earthwork on the ground located  immediately NE of the bloomery mound.

Colour generated magnetometry plot of Cinder Nab bloomery

Colour generated magnetometry plot of Cinder Nab bloomery

Magnetometry plot of Cinder Nab bloomery

Magnetometry plot of Cinder Nab bloomery

Challenging conditions for the magnetometry survey on the bloomery at Ghyll Head, Windermere

Challenging conditions for the magnetometry survey on the bloomery at Ghyll Head, Windermere

The magnetometry survey at the Ghyll Head bloomery (north to top) was tightly constrained by the steep surrounding topography and dense vegetation cover. The interpretation of the site has come into question because of the features surrounding (and possibly masking) the bloomery mound as probably being associated with a later bobbin mill. Also Post-medieval period pottery and coal nodules were retrieved from the top surface of the slag mound.

Thankfully the geophysical survey results identified a single furnace located just below the main slag heap. The dipolar anomaly results for the furnace is depicted on the colour plot as a red blob almost completely surrounded by blue. This signal corresponds to a  small circular earthwork mound visible on the ground below the main slag mound. The rest of the results on the plot are related to the main slag mound. Interestingly there are no obvious results for features associated with the nearest building platform to the bloomery.

Colour generated magnetometry plot of Ghyll Head bloomery

Colour generated magnetometry plot of Ghyll Head bloomery

The site at Ghyll Head still needs many questions answering regarding the relationship between the bloomery and surrounding features. Was the bloomery a simple medieval period version powered by hand bellows? Was it a later water powered site with waterwheel and buildings? or are the surrounding buildings associated with the bobbin mill?

Magnetometry plot of Ghyll Head bloomery

Magnetometry plot of Ghyll Head bloomery

So what is next for these three bloomery sites? Well we will use the geophysical results and revisit each of them to retrieve secure dating samples to be processed for radiocarbon dating. I will also post the completed survey drawings for each of the bloomery sites as and when they are drawn up and overlay the geophyics results so they will all make a bit more sense to people who haven’t visited them in person. A special thanks should go to everyone who has helped both myself and Ian with the topographic and geophyical surveys over the last two weeks.

Blelham Tarn – The excavation starts

The geophysics results look great!

Windermere Reflections

Today was a fairly epic day at Blelham Tarn. We got the initial geophysics results back, which were spectacular, and on the back of that we were able to select an area for excavation and open a trench. The magnetometry survey had on the previous day extended over the area of the bloomery and was undertaken at a much higher resolution than had previously been undertaken and makes very exciting viewing.

The magnetometry survey in progress The magnetometry survey in progress

The initial magnetometry results from Blelham Tarn The initial magnetometry results from Blelham Tarn

The long black linear feature on the right is the tail race, and  at the top of that is a square white feature, which must correspond with a wheel pit.   To the left of that are two circular, very highly magnetic, features, which we are interpreting as the furnaces.  To the left of the tail race is a large rectangular structure, which we are tentatively suggesting was…

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Pommes de terre

Detail of seed potatoes

Detail of seed potatoes

An otherwise uneventful visit to Cheshire last month for a walkover survey led to a few images of potato planting… and a large pile of poo.

 

Survey of the bloomery site at Cinder Nab, Windermere

Cinder Nab bloomery, Windermere

Cinder Nab bloomery, Windermere

The beginning of the week saw the completion of the topographic survey at the third of the four bloomery sites presently under investigation around Windermere. This site, at the aptly named Cinder Nab, is located adjacent to the shore on the south-west end of the lake and is a little distance to the south-east of Stott Park bobbin mill.

Surveying at Cinder Nab bloomery, Windermere

Surveying at Cinder Nab bloomery, Windermere

The monument, consisting of a large turf covered kidney-shaped mound of slag, along with its location adjacent to a body of water, is typical of the surviving elements found at medieval bloomery sites. The mound is in a very picturesque setting overlooking lake and it looked particularly lovely as it was covered in a dense carpet of bluebells interspersed with a smattering of cowslips.

Eroded section of slag deposits on the lake shore near Cinder Nab bloomery, Windermere

Eroded section of slag deposits on the lake shore near Cinder Nab bloomery, Windermere

The mound was bounded by a slight linear bank on the west side and in the past was apparently contained within a small copse of woodland immediately on the shore of the lake. It is surrounded by several other features, including a pair of smaller spoil mounds and the foundations of a presumably much later kiln that has been inserted into the shore edge just to the side of the bloomery mound.

Foundations of a later kiln adjacent to Cinder Nab bloomery, Windermere

Foundations of a later kiln adjacent to Cinder Nab bloomery, Windermere

The lake shore immediately adjacent to the mound has been eroded back exposing nodules of slag onto the foreshore, including one rather large example. The eroded section was cleaned back and recorded, it revealed deposits of slag waste, burnt charcoal-filled deposits and burnt clay layers. Evidently material associated with the furnace at the bloomery, including waste slag, fuel and clay from the furnace structure itself were dumped on the lake edge.

Large piece of slag eroded out on the lake shore at Cinder Nab, Windermere

Large piece of slag eroded out on the lake shore at Cinder Nab, Windermere

There was no obvious evidence for in-situ structural remains of a furnace in the exposed section and the furnace(s) must be elsewhere on the site, and as usual cannot be seen above ground. The site will now be subject to geophysical survey to identify the presence of any furnaces and any other possible evidence for sub-surface archaeological remains.

Recording the eroded section of slag deposits on the lake shore at Cinder Nab, Windermere

Recording the eroded section of slag deposits on the lake shore at Cinder Nab, Windermere

 

Drawing the slag mound at Cinder Nab bloomery, Windermere

Drawing the slag mound at Cinder Nab bloomery, Windermere