Title: |
Geophysical Survey at Norton Fitzwarren Hillfort, Norton Fitzwarren, Somerset |
Series: |
SUMO Geophysics Limited unpublished reports
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Downloads: |
sumogeop1-505861_188354.pdf (7 MB)
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Download
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Licence Type: |
Creative Commons Attribution 4.0 International Licence
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DOI |
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Publication Type: |
Report (in Series)
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Abstract: |
A temporary grid system was 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. Data will be collected using a cart carrying four paired Bartington magnetic sensors. Four 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. Each data point is geographically referenced using an on-board Trimble RTK survey grade GPS system. Readings will be taken at 0.125m centres along traverses 1.0m apart. Readings relate to the difference in localised magnetic anomalies compared with the general magnetic background. At the end of every data collection a zone of data was recollected as a control. The magnetometer survey has identified a number of features of archaeological interest and there is generally very good correlation with the aerial photographic evidence; the geophysical data has the advantage of being accurately georeferenced making any targeted excavation far easier to locate. The results confirm the presence of a number of enclosures, many on a similar alignment; a few ring ditches, some well-defined, others less so; several pit-like responses plus tentative fired features. Short lengths of tracks are visible near the entrances, but these cannot be traced across the fort. |
Author: |
John A Gater
Thomas Cockcroft
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Publisher: |
Sumo Geophysics
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Year of Publication: |
2022
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Locations: |
Parish: |
Norton Fitzwarren |
County: |
Somerset |
Country: |
England |
District: |
Somerset West and Taunton |
Grid Reference: 319625, 126261 (Easting, Northing)
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Subjects / Periods: |
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Identifiers: |
OASIS Id: |
sumogeop1-505861 |
Report id: |
05788 |
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Source: |
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Relations: |
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Created Date: |
12 Jul 2023 |