Evershed, R. (2021). GEOPHYSICAL SURVEY BY MAGNETOMETRY: GRANGE FARM SOLAR PROJECT, PALGRAVE, SUFFOLK – PHASE 1 SURVEY. Allen Archaeology. https://doi.org/10.5284/1092130. Cite this using datacite

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Title:		 GEOPHYSICAL SURVEY BY MAGNETOMETRY: GRANGE FARM SOLAR PROJECT, PALGRAVE, SUFFOLK – PHASE 1 SURVEY
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Series:		 Allen Archaeology Ltd unpublished report series
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allenarc1-503339_188548.pdf (14 MB) : Download
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https://doi.org/10.5284/1092130
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Publication Type:		 Report (in Series)
Abstract
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Abstract:		 The geophysical survey consisted of a detailed gradiometer survey of as much of the development area as was suitable, coming to approximately 11.0 hectares. The survey was undertaken using a multi-sensor cart system using 4 fluxgate magnetometers set 0.5m apart. A multi-sensor cart system was used to allow the geophysical surveyor to gather high quality data at a faster rate than is possible with other magnetic techniques. Four Grad601 fluxgate magnetometers were mounted on to a cart which was towed by a 4 x 4 Kawasaki mule or similar. GPS is completely integrated into the system, eliminating the need to mark up a set of survey lines. All instrument outputs could be seen in real time allowing instant quality control and analysis. The survey was undertaken with data collected at a sampling frequency of c.6Hz (c.0.20m sample interval – 5 readings /m). The zigzag traverse method of survey was used, with a 0.5m wide separation between fluxgate magnetometers covering a 2m wide swath at a time. The sensitivity of the fluxgate magnetometers was set to record magnetic variation in the order of 0.1 nanoTesla. Geomar MLgrad601 data logging system was used to record data in the field using a Panasonic Toughbook. The main function of this program is to position each Grad601 sensor based on the recorded GPS position and the configuration of the system. Following the post-processing of the data in this software all data is exported to an ASCII file format. The data collected from the survey was then imported into Terrasurveyor 3.0.37.25. 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 geophysical survey has identified a few features of archaeological interest. These include a pair of parallel positive linear features which may represent parallel ditches either side of a former trackway, as well as a long positive linear features which may represent a former field boundary or enclosure feature. The survey also revealed a few potential positive linear features which could represent drainage or modern cultivation trends as well as a long potential positive linear feature which could represent a ditch, path or track.
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Author:		 R. Evershed
Publisher
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Publisher:		 Allen Archaeology
Year of Publication
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Year of Publication:		 2021
Locations
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Locations:
District: Mid Suffolk
County: Suffolk
Parish: Palgrave
Country: England
Grid Reference: 610351, 278132 (Easting, Northing)
Subjects / Periods
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Subjects / Periods:
MAGNETOMETRY SURVEY (Event)
DITCH (Monument Type England)
UNCERTAIN DITCH (Tag)
UNCERTAIN (Historic England Periods)
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OASIS Id: allenarc1-503339
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Created Date:		 22 Apr 2022