Cockcroft, T. and Gater, J. A. (2021). Geophysical Survey at Land at Hospital Cross, Helston Downs, Helston. Sumo Geophysics. https://doi.org/10.5284/1112881. Cite this using datacite

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Title:		 Geophysical Survey at Land at Hospital Cross, Helston Downs, Helston
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Series:		 SUMO Geophysics Limited unpublished reports
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sumogeop1-503392_185050.pdf (5 MB) : Download
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Creative Commons Attribution 4.0
International Licence
DOI
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DOI
https://doi.org/10.5284/1112881
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Publication Type:		 Report (in Series)
Abstract
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Abstract:		 temporary grid system will be established over the site and marked out using canes. The location of the grid will be set out using an RTK GPS system theoretically accurate to some 0.01m and referenced to OS co-ordinates. Hand Held: Data will be collected using a Bartington Grad 601-2. The instrument consists of two paired sensors (see below) and readings are logged at 0.25m centres along traverses 1.0m apart across 30m grids. The collection of data at 0.25m centres provides an appropriate methodology balancing cost and time with resolution as per Historic England guidelines. Two sensors mounted 1m horizontally apart and very accurately aligned to nullify the effects of the earth's magnetic field. Readings relate to the difference in localised magnetic anomalies compared with the general magnetic background. A magnetometer survey of 2.4 hectares of land at Hospital Cross, Helston, has identified no responses which could be interpreted as being of archaeological interest. Weak uncertain trends could be indicative of ridge and furrow or a result of minor magnetic variations in the underlying geology.
Author
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Author:		 Thomas Cockcroft
John A Gater
Publisher
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Publisher:		 Sumo Geophysics
Other Person/Org
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Other Person/Org:		 Cornwall and Scilly HER (OASIS Reviewer)
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Year of Publication:		 2021
Locations
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Locations:
District: Cornwall
County: Cornwall
Country: England
Parish: Helston
Grid Reference: 166769, 26307 (Easting, Northing)
Subjects / Periods
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Subjects / Periods:
MAGNETOMETRY SURVEY (Event)
GEOPHYSICAL SURVEY (Event)
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OASIS Id: sumogeop1-503392
Report id: 05318
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Created Date:		 23 Aug 2023