Watson, N. (2020). KING’S QUARTER / WHITEFRIARS (PLOT 4) GLOUCESTER: GEOARCHAEOLOGICAL ASSESSMENT OF BOREHOLE STRATIGRAPHY. ARCA. https://doi.org/10.5284/1097352. Cite this using datacite

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Title:		 KING’S QUARTER / WHITEFRIARS (PLOT 4) GLOUCESTER: GEOARCHAEOLOGICAL ASSESSMENT OF BOREHOLE STRATIGRAPHY
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Series:		 ARCA unpublished report series
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arca1-504688_186967.pdf (787 kB) : Download
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https://doi.org/10.5284/1097352
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Publication Type:		 Report (in Series)
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Abstract:		 Borehole survey This document reports on the geoarchaeological significance of strata sampled from two boreholes drilled at the King’s Quarter /Whitefriars (Plot 4) site in July 2020 at the request of Cotswold Archaeology Ltd. The boreholes were drilled through the backfill of Trenches 2 and 5 in order to record strata too deep for archaeological excavation. Five records of BGS geotechnical boreholes and three records of Oxford Archaeology Ltd boreholes are also discussed. The sedimentary sequence found in the boreholes is divided into five stratigraphic units. These units are from youngest to oldest: 1. Made Ground: gravel backfill (modern). 2. Archaeological diamict (Holocene). 3. Fine grained alluvium (Holocene). 4. Cheltenham Sand and Gravel (Pleistocene). 5. Blue Lias and Charmouth Mudstone Formation (Triassic: Lias Group bedrock). The River Twyver occupies a valley c. 300m wide and 4m deep, and is at present in a culvert that bisects the site from southeast to northwest. The Lias Group bedrock is found between 12.07m OD and 11.51m OD. More deeply incised mudstone lies on the south side of the valley c. 40m from the site where a sharp rise in the bedrock is also evident. Thin, weathered and reworked deposits of Pleistocene date overlie the bedrock. In the Holocene, thin fine grained alluvial deposits containing granules of ceramic building material (cbm) fill a channel of the River Twyver at 12.97m OD. The succeeding very thin flood plain silt/clays are at first sterile of archaeological material but higher in the stratigraphy more humic clays are found, and contain charcoal, cbm, bone fragments and limestone clasts. These humic clay deposits were also encountered at the base of Trenches 2 and 5. Thick alluvial deposits with intercalated organics are found in one Oxford Archaeology Ltd borehole to the south of the site. Modern gravel backfill capped the core sequence.
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Author:		 Nick Watson
Publisher
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Publisher:		 ARCA
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Year of Publication:		 2020
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Locations:
County: Gloucestershire
District: Gloucester
Country: England
Parish: Gloucester, unparished area
Grid Reference: 383499, 218641 (Easting, Northing)
Subjects / Periods
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Subjects / Periods:
BOREHOLE SURVEY (Event)
ALLUVIUM (Object England)
UNCERTAIN ALLUVIUM (Tag)
UNCERTAIN (Historic England Periods)
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OASIS Id: arca1-504688
Report id: 2021-3
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Created Date:		 18 Jul 2022