Law, M. (2019). River of Life II: Geoarchaeological Survey Report. London: DigVentures. https://doi.org/10.5284/1117135. Cite this using datacite

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Title:		 River of Life II: Geoarchaeological Survey Report
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Series:		 DigVentures unpublished report series
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digventu1-508076_190287.pdf (9 MB) : Download
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Biblio Note		 This report was uploaded to the OASIS system by the named Publisher. The report has not been reviewed by the relevant HER. The report has been transferred into the ADS Library for public access and to facilitate future research.
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DOI
https://doi.org/10.5284/1117135
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Publication Type:		 Report (in Series)
Abstract
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Abstract:		 FIELDWORK Four window samples (denoted WS01 - WS04) were extracted at each site, down to a maximum depth of 2 metres using a petrol driven JCB percussion hammer. Hand-dug pits were excavated to 1.2m depth below ground level in each case, in case of buried services. The resulting cores were subject to detailed geoarchaeological recording on site. Four subsamples were taken off site for laboratory processing. DEPOSIT MODELLING Window sample and test pit data from the current survey was used in the deposit model construction, as well as archive data held by the British Geological Survey (BRITISH GEOLOGICAL SURVEY 2019). There are many borehole records in the study area, however the majority of these were discounted from inclusion because they do not report elevation above Ordnance Datum, Records were visually examined and spatial data (Eastings, Northings and height above Ordnance Datum) extracted, corresponding to three key sedimentary facies. These were the modern ground surface, the surface of the alluvium and the surface of the Northmoor terrace gravel. Extracted data was tabulated in a csv file and imported into a GIS (Geographic Information Systems) program (QGIS 2.18.10 Las Palmas) using the OSGB 1936 co-ordinate reference system. At its simplest, deposit modelling is way of extending the coverage of a series of points with known z (elevation) values to the spaces in between the points in order to predict the elevation of deposit across a study area. This is done through a number of different statistical methods, outlined in Wheatley & Gillings (2002: 163–178) and Lloyd & Atkinson (2004). LABORATORY PROCEDURES In order to assess the presence of biological remains or lithic debitage, four sub-samples of up to 100g weight from Clifton Meadow were washed through a 65μm mesh sieve. The sub-samples were taken from sediments in which shells had been seen during geoarchaeological recording. The resulting residue was then air dried and passed through a nest of sieves (2mm, 1mm, 500μm, 250μm, 125μm) before each fraction was scanned under a low power binocular microscope (x10 – x40 magnification). Mollusca and plant macrofossils were identified with comparison to a reference collection. Ecological information for Mollusca are derived from Evans (1972), Macan (1977), Kerney and Cameron (1979), Davies (2008), and Killeen et al. (2004). The survey revealed that the modern topsoil is underlain by Holocene overbank alluvium at all sites, which in turn overlies gravelly sands of the Northmoor (Floodplain) Terrace of the River Thames. At the eastern side of Clifton Meadow, a peat deposit is stratified within the Holocene alluvium.
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Author:		 Matthew Law ORCID icon
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Publisher:		 DigVentures
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Year of Publication:		 2019
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Locations:
District: South Oxfordshire
Parish: Long Wittenham
Parish: Little Wittenham
Country: England
Parish: Dorchester
County: Oxfordshire
Grid Reference: 458006, 193744 (Easting, Northing)
Grid Reference: 456877, 194391 (Easting, Northing)
Grid Reference: 455675, 195695 (Easting, Northing)
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Subjects / Periods:
BOREHOLE SURVEY (Event)
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OASIS Id: digventu1-508076
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Created Date:		 19 Jan 2024