archaeological evaluation report: geophysical …
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ARCHAEOLOGICAL EVALUATION REPORT:
GEOPHYSICAL SURVEY BY MAGNETOMETRY ON LAND NORTH OF TOWNGATE EAST, EAST OF
PETERBOROUGH ROAD AND SOUTH OF NORTHFIELD ROAD, MARKET DEEPING, LINCOLNSHIRE
NGR: TF 1350 1108
AAL Site Code: MADE 13
Oasis Number: allenarc1-150497
Report prepared for Bidwells on behalf of Larkfleet Homes
By
Allen Archaeology Limited
Report Number AAL2013052
May 2013
Contents
Executive Summary 1
1.0 Introduction 2
2.0 Site Location and Description 2
3.0 Planning Background 2
4.0 Archaeological and Historical Background 3
5.0 Methodology 3
5.1 Summary of Survey Parameters 4
5.2 Data Collection and Processing 4
6.0 Magnetometer Survey Results 5
7.0 Discussion and Conclusions 7
8.0 Effectiveness of Methodology 8
9.0 Acknowledgements 8
10.0 References 9
List of Figures
Figure 1: Site location outlined in red
Figure 2: Site location outlined in red
Figure 3: Greyscale raw data and processed trace plot for Fields 1 and 2
Figure 4: Greyscale raw data and processed trace plot for Fields 3, 4 and 5
Figure 5: Processed greyscale plot of Fields 1 and 2 with interpretation
Figure 6: Processed greyscale plot of Fields 3, 4 and 5 with interpretation
Figure 7: Processed greyscale plot located in real space
Figure 8: Interpretative plot in real space
Document Control
Element Name Date
Report prepared by: Robert Evershed BSc (Hons) 17/05/2013
Illustrations prepared by: Robert Evershed BSc (Hons) 17/05/2013
Report edited by: Chris Clay MA (Hons) 20/05/2013
Report produced by: AAL2013052 20/05/2013
All AAL reports are printed double-sided on 100% recycled paper to reduce our carbon footprint
Cover image: General shot of field 5 during survey, taken from southwest corner looking north
1
Executive Summary
• A geophysical survey by magnetometer was undertaken by Allen Archaeology Limited for Bidwells on
behalf of Larkfleet Homes, on land off Towngate East in Market Deeping, Lincolnshire prior to submission
of a planning application for a residential development.
• There is extensive evidence for prehistoric and Roman activity in the area, particularly to the north and
northwest of the site. The Roman Car Dyke forms the eastern site boundary. The current site is situated to
the north of the historic core of the village.
• The site conditions proved receptive to geophysical surveying, and identified geophysical anomalies in all
five fields surveyed. A short curvilinear feature was identified which may be an early enclosure ditch of
later prehistoric or Roman date. To the east, an area of interference was recorded that may represent the
ploughed out remnants of the western bank of the Car Dyke. An adjacent area of magnetic disturbance,
at the southeast corner of the site, may represent a ploughed out structure of uncertain date.
• Medieval ridge and furrow cultivation was identified in four of the five fields, as either geophysical
anomalies, earthworks, or both. These anomalies have the potential to mask earlier features.
2
1.0 Introduction
1.1 Allen Archaeology Limited was commissioned by Bidwells on behalf of Larkfleet Homes to
undertake a geophysical survey by magnetometer on land off Towngate East in Market
Deeping, Lincolnshire prior to a submission of a planning application for residential
development.
1.2 The site works and reporting conform to current national guidelines, as set out in ‘Geophysical
Survey in Archaeological Field Evaluation’ (English Heritage 2008), ‘The Use of Geophysical
Techniques in Archaeological Evaluations’ (IFA Paper 6) and the Institute for Archaeologists
‘Standard and guidance for archaeological geophysical survey’ (IfA 2011) and a specification
prepared by this company (AAL 2013).
1.3 The site is archaeologically sensitive, lying in an area of archaeological interest and potential.
2.0 Site Location and Description
2.1 Market Deeping is located in the administrative district of South Kesteven District Council,
approximately 13.5km north-northwest of central Peterborough and 62km south-southeast
of central Lincoln. The proposed development site is on the northern outskirts of the town,
and comprises a sub-rectangular block of approximately 15 hectares of predominately
agricultural land, with an industrial development (Spitfire Park) at the centre of the site. It is
bounded by Northfield Road to the north, the Car Dyke to the east, Towngate East to the
south, and Peterborough Road to the west. The site is centred on NGR TF 1350 1108 and lies
at a height of approximately 4m above Ordnance Datum.
2.2 The local superficial geology comprises river terrace deposits of sand and gravel, overlying a
bedrock geology of Oxford Clay Formation mudstone (British Geological Survey 1984).
3.0 Planning Background
3.1 It is proposed in due course to submit a planning application for a residential development on
the site. Prior to the submission of the application, it has been requested by the Senior Historic
Environment Officer at Heritage Trust for Lincolnshire, that a programme of archaeological
evaluation should be undertaken to provide further information concerning the archaeological
potential of the proposed development area, and to allow the planning authority to establish
appropriate measures to mitigate the effect of the proposed development upon the
archaeological resource. The first stage of these investigations is the current non-intrusive
geophysical survey.
3.2 The approach adopted is consistent with the recommendations of the National Planning Policy
Framework (NPPF), with the particular chapter of relevance being ‘Chapter 12: Conserving and
enhancing the historic environment’ (Department for Communities and Local Government
2012).
3
4.0 Archaeological and Historical Background
4.1 An archaeological desk-based assessment of the site was undertaken in 2011 (AAL 2011), the
results of which are summarised below:
4.2 Prehistoric and Roman activity is well represented in the vicinity of the site, with numerous
prehistoric flint scatters recorded during works in advance of the construction of the Market
Deeping bypass to the north and west of the site. The bypass route intersected numerous
cropmarks of possible prehistoric to Roman date and exposed pits, ditches and roundhouses
of Late Bronze Age to Iron Age date, along with Roman field systems and cremations. The
eastern boundary of the site is also formed by the Roman Car Dyke, a major artificial
waterway running from Peterborough to Lincoln.
4.3 Market Deeping was a prosperous medieval market town, although the current site lies to the
north of the historic core of the settlement. Monitoring of groundworks during the
construction of Spitfire Park within the site recovered scatters of medieval pottery and a
spread of burnt clay interpreted as a possible hearth, with further manuring scatters
recovered along the line of the bypass.
5.0 Methodology
5.0.1 The geophysical survey consisted of a detailed gradiometer survey of the entirety of the
proposed development area that was available for survey, totalling approximately 14
hectares. The industrial development of Spitfire Park was excluded, as well as a small area at
the northwest corner of the site that was too overgrown to survey.
5.0.2 The fieldwork was carried out by a team of two experienced geophysicists from AAL over a
period of six working days, Thursday 2nd
to Friday 10th
May 2013. The site was divided into
30m by 30m grids, established on site with reference to local fixed boundaries and accurately
tied into the National Grid with Ordnance Survey base mapping using a Leica GS08 Netrover
receiving RTK corrections.
5.0.3 The survey was undertaken using a Bartington Grad601-2 Dual Fluxgate Gradiometer with an
onboard automatic DL601 data logger. This instrument is a highly stable magnetometer which
utilises two vertically aligned fluxgates, one positioned 1m above the other. This arrangement
is then duplicated and separated by a 1m cross bar. The 1m vertical spacing of the fluxgates
provides for deeper anomaly detection capabilities than 0.5m spaced fluxgates. The dual
arrangement allows for rapid assessment of the archaeological potential of the site. Data
storage from the two fluxgate pairs is automatically combined into one file and stored using
the onboard data logger.
5.0.4 Data collection was undertaken in a zigzag traverse pattern, using a sample interval of 0.25m
and a traverse interval of 1m.
5.0.5 The fieldwork and reporting were carried out in accordance with the procedures in
‘Geophysical Survey in Archaeological Field Evaluations’ (English Heritage 2008) and ‘The Use
of Geophysical Techniques in Archaeological Evaluations: IfA Paper 6’ (Gaffney et al. 2002)
4
5.1 Summary of Survey Parameters
5.1.1 Fluxgate Magnetometer
Instrument: Bartington Grad601-2 Dual Fluxgate Gradiometer
Sample interval: 0.25m
Traverse interval: 1.00m
Traverse separation: 1.00m
Traverse method: Zigzag
Resolution: 0.1 nT
Processing software: Terrasurveyor 3.0.20
Surface conditions: Grass crop
Area surveyed: 14 ha
Date surveyed: Thursday 2nd
– Friday 10th
May 2013
Surveyor: Robert Evershed
Survey assistants: Iain Pringle
Data interpretation: Robert Evershed
5.2 Data Collection and Processing
5.2.1 The grids were marked out using tapes from the southwest corner of the site. The collection
of magnetic data using a north – south traverse pattern is preferable for a magnetic survey, as
enhancements to the magnetic field caused by buried features is mapped increasingly
stronger the closer the traverse direction can get to a magnetic north – south direction
(Breiner 1999). On this occasion magnetic data was collected on an approximate north-
northwest – south-southeast alignment due to the orientation of the survey grids in all the
fields. Data was collected by making successive parallel traverses across each grid in a zigzag
pattern. Several key points of the survey grids were accurately tied into the National Grid with
Ordnance Survey base mapping using a Leica GS08 Netrover receiving RTK corrections.
5.2.2 The data collected from the survey has been analysed using the current version of
Terrasurveyor 3.0.20. The resulting data set plots are presented with positive nT/m values and
high resistance as black and negative nT/m values and low resistance as white.
The data sets have been subjected to processing using the following filters:
• De-stripe (also known as Zero Mean Traverse or ZMT)
• Clipping
5.2.3 The de-stripe process is used to equalise underlying differences between grids or traverses.
Differences are most often caused by directional effects inherent to magnetic surveying
instruments, instrument drift, instrument orientation (for example off-axis surveying or
heading errors) and delays between surveying adjacent grids. The de-stripe process is used
with care however as it can sometimes have an adverse effect on linear features that run
parallel to the orientation of the process.
5.2.4 The clipping process is used to remove extreme data point values which can mask fine detail
in the data set. Excluding these values allows the details to show through.
5
5.2.5 Plots of the data are presented in processed linear greyscale (smoothed) with any corrections
to the measured values or filtering processes noted, and as separate simplified graphical
interpretations of the main anomalies detected.
6.0 Magnetometer Survey Results (Figures 3 – 8)
6.1 For the purposes of interpreting the anomalies, the survey data has been processed to the
values of -3 to 3 nT/m (Figure 5 and 6). This enhances faint anomalies that may otherwise not
be noted in the data; however it also includes all ferrous and other magnetically enhanced
material within the study area, making the resulting greyscale image particularly ‘noisy’. The
survey results revealed a number of anomalies across the data set, and these are discussed in
turn and noted as single and double digit numbers in square brackets.
6.2 A number of dipolar responses were detected across the survey area, with some examples
highlighted as yellow circles. These are likely to be associated with modern ferrous waste or
highly fired material within the ploughsoil.
6.3 All the fields surveyed showed areas of magnetic noise, the majority of which is the result of
modern waste and detritus, however some areas produced magnetic noise related to other
causes and these have been discussed field by field below.
Field 1
6.4 The most striking results in Field 1 are the broadly parallel linear positive magnetic anomalies
[1] running east-northeast to west-southwest across the field. These mainly produced
magnetic readings of around 2 to 4 nT/m, although some produced readings as high as
8nT/m. These are very likely to represent remnants of medieval ridge and furrow cultivation.
6.5 The area of magnetic noise [2] running around the majority of the field is almost certainly the
result of an accumulation of modern waste and detritus along the field boundaries. This
produced a reading of approximately -30 to 30 nT/m, although there were small areas
producing spikes of much higher readings- especially in the northeast corner of the survey
where a reading of -100 to 3000nT/m may indicate either a very large ferrous object or
possibly a modern service such as an electrical cable.
Field 2
6.6 Immediately obvious is the dipolar linear anomaly [3] running north-northeast to south-
southwest across the south-eastern corner of the field. This produced a magnetic reading of -
20 to 80nT/m and is likely to represent a modern service pipe crossing the field. Due to its
relatively low reading for a modern service it is likely to be a gas or water pipe as opposed to a
live electrical cable.
6.7 The very large dipolar reading [4] to the south of [3] appears to correspond with the location
of a pond on the modern Ordnance Survey Map but no longer visible in the field. The strength
of the signal for this anomaly indicates the filling in of the pond with highly magnetic material
or ferrous objects, such as brick rubble.
6
6.8 As with the adjacent Field 1, this field contained numerous positive linear anomalies [5]
running east-northeast to west-southwest. These produced readings of 2 to 6nT/m, with
occasional readings as high as 10nT/m. Also present were a number of parallel negative
magnetic linear anomalies [6], which produced readings of -1 to -3nT/m, these again
represent ridge and furrow agriculture within this field.
6.9 There is a possible positive curvilinear anomaly [7] in the north-western quarter of the field.
This produced readings of 2 to 4nT/m, and may represent a small enclosure ditch possibly
relating to an earlier field system, predating the ridge and furrow.
6.10 The group of dipolar responses [8] appear to relate directly to a small copse of trees within
the field.
Field 3
6.11 Within Field 3 there is again a series of positive linear anomalies [9] running east-northeast to
west-southwest, producing readings of 1 to 3nT/m, and again associated with ridge and
furrow agriculture of likely medieval date.
6.12 The very large area of magnetic noise [10], running along the southern part of the
southwestern boundary is likely caused by ferrous objects, buildings and/or modern services
in the recently developed industrial park in the adjacent field. The readings produced were as
high as 100nT/m.
Field 4
6.13 The two parallel positive linear magnetic anomalies [11] running broadly east – west across
the field likely correspond to a ridge and furrow headland observed in the field, visible as a
low linear earthwork. They both produced magnetic readings of 1 to 2 nT/m. The ridge and
furrow visible in this field was running broadly north-northwest to south-southeast through
the northern part of the field, but was not visible in the survey data.
6.14 In the southwestern corner of the field there is a large amount of magnetic noise [12] related
to a group of outbuildings/stables.
6.15 There is a group of dipolar responses [13], measuring -40 to 40nT/m, which may represent the
infilling of a former pond, visible in the field as a large, shallow circular depression. The
earthworks in this area appear contemporary with the ridge and furrow in the field.
6.16 The large dipolar response [14] corresponds to a large metal fence post, while the area of
magnetic noise [15], corresponds to a telegraph pole and associated metal cables.
Field 5
6.17 The magnetic noise [16] running along the eastern boundary of the field is likely to be
associated with the Car Dyke that forms the eastern boundary to the field, representing either
7
upcast from periodic cleaning out of the dyke or a denuded bank. This produced magnetic
readings of -20 to 30nT/m, although there are numerous larger spikes within the area.
6.18 The area of magnetic noise [17] close to the south-eastern corner of the field had a magnetic
reading of between -10 to 20nT/m, although the majority of the readings were between -4 to
4nT/m. It is possible that these relate to a rubble spread beneath the ploughsoil, possibly
relating to a former structure situated here.
6.19 The magnetic noise [18] in the northernmost corner of the site is due to another telegraph
pole and associated metal cables.
7.0 Discussion and Conclusions
7.1 The site conditions proved receptive to geophysical surveying, with evidence for
anthropogenic activity identified across the study area.
7.2 Potentially the earliest feature recorded was a curvilinear anomaly towards the north end of
Field 2. Although rather faint in the survey data and incomplete, this may potentially
represent part of a later prehistoric or Romano-British enclosure feature, examples which are
well represented in the vicinity of the site, for example along the line of the Market Deeping
bypass to the north and northwest of the site.
7.3 Alongside the eastern boundary of the development area, which is defined by the Car Dyke,
there was an area of magnetic noise that may relate to a former ploughed out bank along the
western side of the Car Dyke. An evaluation undertaken in 1996 just to the north of the site in
advance of the bypass construction, revealed a gravel rich layer that was identified as the
ploughed-out remnants of the east bank of the Car Dyke, sealing an earlier buried soil
(Simmons and Cope-Faulkner, 2004). A similar gravel layer, this time sealed by dyke upcast,
has also been recorded to the east of the site, off Wellington Way (Casa and Wood 1997). It is
highly possible that similar remnants are located to the west of the Car Dyke within Field 5,
and may potentially seal earlier buried soil horizons.
7.4 Evidence for medieval ridge and furrow agriculture was observed in Fields 1 to 4. The ridge
and furrow survived as earthworks in Fields 2 and 4, whereas it had been ploughed flat in
Fields 1 and 3 and only survived as subsurface features. It is worth noting that, except for an
east – west aligned headland, the visible ridge and furrow in Field 4 was not apparent during
the survey, and this is most likely due to the fact that the earthworks ran parallel to the
orientation of the survey grids, which can sometimes hamper feature detection in the survey
data. There is the potential that the ridge and furrow earthworks mask earlier anomalies of
potential archaeological significance.
7.5 In Field 5 there was no trace of ridge and furrow either as visible earthworks or in the survey
data. This may be because the traverses across the field were parallel to any former ridge and
furrow, although it is more likely that modern ploughing within this field has completed
removed any trace of the features.
7.6 An area of magnetic noise was recorded at the south end of Field 5, that may correspond to a
sub-surface rubble spread, indicative of a former structure. No features are shown in this area
on the historic mapping however which would explain the anomaly, and as such its date and
interpretation remain unclear.
8
8.0 Effectiveness of Methodology
8.1 The non-intrusive evaluation methodology employed was particularly appropriate to the scale
and nature of the site to be surveyed. Magnetometry surveying was the prospection
technique best suited to the identification of archaeological remains on the site. Other
techniques would have required justification and may have proved too time consuming or
cost-prohibitive. Although there was evidence for modern disturbance, from ferrous material
within the topsoil and detritus around the field margins, it does not affect the results
significantly.
9.0 Acknowledgements
9.1 Allen Archaeology would like to thank Bidwells, on behalf of Larkfleet Homes for this
commission. Thanks are also offered to the various landowners and tenants for allowing
access to the site at short notice.
9
10.0 References
AAL, 2011, Archaeological Desk-Based Assessment: Land North of Towngate East, East of
Peterborough Road and South of Northfield Road, Market Deeping, Lincolnshire, Allen Archaeology
Limited report number 2011016
Bartington, G. and Chapman, C.E., 2004, A High-stability Fluxgate Magnetic Gradiometer for Shallow
Geophysical Survey Applications. Archaeological Prospection 11 (1) 19-34
Breiner, S., 1999, Applications Manual For Portable Magnetometers, Geometrics, California
British Geological Survey, 1992, Spalding. England and Wales Sheet 144. Solid and Drift Geology.
1:50000 Provisional Series. Keyworth, Nottingham: British Geological Survey
Casa, R. and Wood, M., 1997, Archaeological watching brief on land north-west of Wellington Way,
Market Deeping, Lincolnshire, Professional Independent Services in Archaeology, unpublished report
Department for Communities and Local Government, 2012, National Planning Policy Framework,
Department for Communities and Local Government, London
English Heritage, 2008, Geophysical Survey in Archaeological Field Evaluation. English Heritage
Gaffney, C., Gater, J., and Ovenden, S., 2002, The Use of Geophysical Techniques in Archaeological
Evaluations. IFA Paper No.6. The Institute for Archaeologists
IfA, 2011, Standard and guidance for archaeological geophysical survey, Institute for Archaeologists,
Reading
LCC, 2012, Lincolnshire Archaeological Handbook: a manual of archaeological practice. Lincoln,
Lincolnshire County Council, Built Environment Dept.
Scollar, I., Tabbagh, A., Hesse, A. and Herzog, I. (eds.), 1990, Archaeological Prospecting and Remote
Sensing. Cambridge University Press
Simmons, B. B. and Cope-Faulkner, P., 2004, The Car Dyke. Past Work, Current State and Future
Possibilities. Lincolnshire Archaeology and Heritage Reports Series No. 8
Wilbourn, D., 2013, Terrasurveyor Program version 3.0.20 User Manual. DW Consulting
Figure 1: Site location outlined in red© Crown copyright 2000. All rights reserved. Licence Number 100047330
Site Code MADE 13
Scales 1:10,000,000
1:1,000,000
1:25,000 @ A4
Drawn by R Evershed
Date 17/05/13
A
Scale 1:10,000,000
Northampton-
shire Cambridgeshire
Suffolk
Norfolk
Lincolnshire
Ely
Huntingdon
Scale 1:1,000,000
A
B
SpaldingKing’s Lynn
Wisbech
Peterborough
Stamford
Grantham
Boston
March
1:25000
B
The Site
Market
Deeping
Area: 15.085ha (37.28ac)
14to
16
11to
1317
to19
Pit Field
North Field
Car
Dyke
Corner
El
El Sub Sta
Play Area
Drain
Track
Farm
RO
MA
NC
AN
AL
Sta
Cottage
A16
A15
6.6m
6.0m
5.8m
6.3m
6.1m
BM
6.83m
B1524
Pond
ETL
Pgto
1to
7
LIM
E
9to
15
Travel Inn
TCB
to 56
NORTH FIELD ROAD
81 to 87
17 to 23
25 to 31
33 to 39
41 to 47
49 to 55
93 to 99
57 to 63
65 to 71
73 to 79
WE
LLING
TON
WAY
LAN
CA
STER
WAY
TOWNGATE EAST
GP
TH
E
ANSON COURT
PEA
CO
CK
SQU
AR
E
AVE
NU
E
SH
AC
KLE
TO
N
TOWNGATE WEST
Towngate Inn
PE
TER
BO
RO
UG
HR
OA
D
c
11
115
125123
131
109
107101
26a
31a
34
33a
7
85
8482
80
7a
79
76
72
68
62
60
58
56
53
49
48
46
44
43
42
39
38
37
35
3
32
9
29
27
26
25
24
23
22
21
20
1b
1a
19
1816
15
14
13
12
5
10
6
a
2A
6A8A
1O
31
4
PE
TER
BO
RO
UG
HR
OA
D
2
A16
TCB
1
1
2
B1524
B1524
24
14
18
11
24
Drain
1
11
76
8
62
14
44
10
2
Drain
10
Drain
6
1
9
7
39
12
1
1
8
6.6m
6
4
3
El Sub Sta
Pit Field
Drain
15
2
5
14
1312
Drain
Drain
9
Drain
LAN
CA
STER
WAY
72
2
15
2
48
68
1
38
1
26
22
SubS
ta
Barn
TRE
E
CLO
SE
PADDOCK
50 3630
30
1a
1OA
PH
to
to
60
to
to
33
6
22
7
to
Figure 2: Site location outlined in red
Site Code MADE 13
Scale 1:2,500 @ A3
Drawn by Robert Evershed
Date 17/05/13
Key
Site Location
51
35
00
311000
N
Field 1
Field 2
Field 3
Field 4
Field 5
40
nT
-40
25nT
Raw data (clipped to +/- 40 nT)
Trace Plot (ZMT and clipped to +/- 25nT)
Figure 3: Greyscale raw data and processed trace plot for Fields 1 and 2
N
Site Code MADE 13
Scale 1:2,500 @ A4
Drawn by Robert Evershed
Date 17/05/13
0 250m
Scale 1:2,500
Field 1
Field 2
40
nT
-40
25nT
Raw data (clipped to +/- 40 nT) Trace Plot (ZMT and clipped to +/- 25nT)
Figure 4: Greyscale raw data and processed trace plot for Fields 3, 4 and 5
N
Site Code MADE 13
Scale 1:2,500 @ A3
Drawn by Robert Evershed
Date 17/05/13
0 250m
Scale 1:2,500
Field 3
Field 4
Field 5
N
3
nT
-3
Processed (ZMT and clipped to +/- 3 nT) Interpretation of Survey Results
Figure 5: Processed greyscale plot of Fields 1 and 2 with interpretation
Site Code MADE 13
Scale 1:2,500 @ A4
Drawn by Robert Evershed
Date 17/05/13Positive magnetic anomaly
Dipolar linear anomaly
Negative magnetic anomaly
Examples* of individual dipolar responsesIndicative of ferrous or highly fired material*smaller responses omitted for clarity
Area of magnetic noise
Field 1
Field 2
[1]
[2]
[3]
[5]
[6]
[7] [8]
[4]
N
3
nT
-3
Processed (ZMT and clipped to +/- 3 nT) Interpretation of Survey Results
Figure 6: Processed greyscale plots of Fields 3, 4 and 5 with interpretation
Site Code MADE 13
Scale 1:2,500 @ A4
Drawn by Robert Evershed
Date 17/05/13Positive magnetic anomaly
Area of magnetic noiseassociated with Car Dyke
Area of magnetic noisepossible rubble spread
Examples* of individual dipolar responsesIndicative of ferrous or highly fired material*smaller responses omitted for clarity
Area of magnetic noise
Field 3
Field 4
Field 5
[9]
[10]
[11][12] [13]
[16]
[17]
[18]
[15]
[14]
Area: 15.085ha (37.28ac)
14to
16
11to
1317
to19
Pit Field
North Field
Car
Dyke
Corner
El
El Sub Sta
Play Area
Drain
Track
Farm
RO
MA
NC
AN
AL
Sta
Cottage
A16
A15
6.6m
6.0m
5.8m
6.3m
6.1m
BM
6.83m
B1524
Pond
ETL
Pgto
1to
7
LIM
E
9to
15
Travel Inn
TCB
to 56
NORTH FIELD ROAD
81 to 87
17 to 23
25 to 31
33 to 39
41 to 47
49 to 55
93 to 99
57 to 63
65 to 71
73 to 79
WE
LLING
TON
WAY
LAN
CA
STER
WAY
TOWNGATE EAST
GP
TH
E
ANSON COURT
PEA
CO
CK
SQU
AR
E
AVE
NU
E
SH
AC
KLE
TO
N
TOWNGATE WEST
Towngate Inn
PE
TER
BO
RO
UG
HR
OA
D
c
11
115
125123
131
109
107101
26a
31a
34
33a
7
85
8482
80
7a
79
76
72
68
62
60
58
56
53
49
48
46
44
43
42
39
38
37
35
3
32
9
29
27
26
25
24
23
22
21
20
1b
1a
19
1816
15
14
13
12
5
10
6
a
2A
6A8A
1O
31
4
PE
TER
BO
RO
UG
HR
OA
D
2
A16
TCB
1
1
2
B1524
B1524
24
14
18
11
24
Drain
1
11
76
8
62
14
44
10
2
Drain
10
Drain
6
1
9
7
39
12
1
1
8
6.6m
6
4
3
El Sub Sta
Pit Field
Drain
15
2
5
14
1312
Drain
Drain
9
Drain
LAN
CA
STER
WAY
72
2
15
2
48
68
1
38
1
26
22
SubS
ta
Barn
TRE
E
CLO
SE
PADDOCK
50 3630
30
1a
1OA
PH
to
to
60
to
to
33
6
22
7
to
Site Code MADE 13
Scale 1:2,500 @ A3
Drawn by Robert Evershed
Date 17/05/13
51
35
00
311000
N
Key
Site Location
Figure 7: Processed greyscale plot located in real space
3
nT
-3
Area: 15.085ha (37.28ac)
14to
16
11to
1317
to19
Pit Field
North Field
Car
Dyke
Corner
El
El Sub Sta
Play Area
Drain
Track
Farm
RO
MA
NC
AN
AL
Sta
Cottage
A16
A15
6.6m
6.0m
5.8m
6.3m
6.1m
BM
6.83m
B1524
Pond
ETL
Pgto
1to
7
LIM
E
9to
15
Travel Inn
TCB
to 56
NORTH FIELD ROAD
81 to 87
17 to 23
25 to 31
33 to 39
41 to 47
49 to 55
93 to 99
57 to 63
65 to 71
73 to 79
WE
LLING
TON
WAY
LAN
CA
STER
WAY
TOWNGATE EAST
GP
TH
E
ANSON COURT
PEA
CO
CK
SQU
AR
E
AVE
NU
E
SH
AC
KLE
TO
N
TOWNGATE WEST
Towngate Inn
PE
TER
BO
RO
UG
HR
OA
D
c
11
115
125123
131
109
107101
26a
31a
34
33a
7
85
8482
80
7a
79
76
72
68
62
60
58
56
53
49
48
46
44
43
42
39
38
37
35
3
32
9
29
27
26
25
24
23
22
21
20
1b
1a
19
1816
15
14
13
12
5
10
6
a
2A
6A8A
1O
31
4
PE
TER
BO
RO
UG
HR
OA
D
2
A16
TCB
1
1
2
B1524
B1524
24
14
18
11
24
Drain
1
11
76
8
62
14
44
10
2
Drain
10
Drain
6
1
9
7
39
12
1
1
8
6.6m
6
4
3
El Sub Sta
Pit Field
Drain
15
2
5
14
1312
Drain
Drain
9
Drain
LAN
CA
STER
WAY
72
2
15
2
48
68
1
38
1
26
22
SubS
ta
Barn
TRE
E
CLO
SE
PADDOCK
50 3630
30
1a
1OA
PH
to
to
60
to
to
33
6
22
7
to
Site Code MADE 13
Scale 1:2,500 @ A3
Drawn by Robert Evershed
Date 17/05/13
N
Key
Site Location
Figure 8: Interpretative plot in real space
51
35
00
311000
Area of magnetic
noiseassociated with Car Dyke
Area of magnetic
noisepossible rubble spread
Area of magnetic
noise
Positive magnetic
anomaly
Dipolar linear
anomaly
Negative magnetic
anomaly
Examples* of
individual dipolar
responsesIndicative of ferrous or
highly fired material*smaller responses omitted for
clarity
Allen Archaeology Limited
Website: www.allenarchaeology.co.uk
Company Registered in England and Wales No: 6935529
Lincoln
Unit 1C
Branston Business Park
Lincoln Road
Branston
Lincolnshire LN4 1NT
Birmingham
Arion Business Centre
Harriet House
118 High Street
Birmingham
B23 6BG
Cambridge
Wellington House
East Road
Cambridge
CB1 1BH
Southampton
International House
Southampton International Business Park
George Curl Way
Southampton
SO18 2RZ
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Email: [email protected]
Tel/Fax: +44 (0) 800 610 2545
Email: [email protected]
Tel/Fax: +44 (0) 800 610 2550
Email: [email protected]
Tel: +44 (0) 800 610 2555
Email: [email protected]