Title: |
WESTGATE HOUSE, RUPERT STREET, BRISTOL BS1: GEOARCHAEOLOGICAL ASSESSMENT |
Series: |
ARCA unpublished report series
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Downloads: |
arca1-210835_1.pdf (1,016 kB)
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Download
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Licence Type: |
ADS Terms of Use and Access
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DOI |
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Publication Type: |
Report (in Series)
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Abstract: |
In August 2014, three boreholes were drilled in the basement of Westgate House (formerly Electricity House), Rupert Street, Bristol by Hydrock. At the request of BaRAS, ARCA carried out a geoarchaeological assessment of sediments recovered in the three boreholes. Bedrock of the Mercia Mudstone Group (MMG) was encountered at the base of all three boreholes, outcropping at between -6.50m OD and -3.10m OD. In WGH BH2, the MMG was unconformably overlain by 2m of gravels of the Pleistocene Avon Formation, which was in turn unconformably overlain by Holocene alluvial/intertidal sediments of Alluvium 2 (an informal subdivision of the Wentlooge Formation). In WGH BH1 and WHG BH3, the MMG was directly overlain by Alluvium 2. Alluvium 2 comprised sands, gravels, and silt/clay strata interbedded with fine sands up to 2.30m thick. These strata appear to have been at least initially deposited in a freshwater environment, possibly during the Early Holocene. In all three boreholes, Alluvium 2 was unconformably overlain by deposits of reddish brown poorly sorted strata up to 3.25m thick, which are likely to represent reworked MMG (e.g. colluvium). The colluvium was in turn overlain by further silt/clay strata of the Wentlooge Formation (Alluvium 1), which were deposited in an intertidal environment. The sedimentary sequence at the site was capped by deposits of Made Ground which are most likely part of the present structure at the site which was built in the 1930s. The excavation of the present basement at the site most likely truncated the Holocene alluvial/intertidal sequence. |
Author: |
Phil Stastney
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Publisher: |
ARCA
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Other Person/Org: |
Historic England (OASIS Reviewer)
Bristol City Council (OASIS Reviewer)
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Year of Publication: |
2014
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Locations: |
Site: |
Westgate House |
County: |
Bristol |
District: |
Bristol, City of |
Parish: |
BRISTOL |
Country: |
England |
Grid Reference: 358700, 173160 (Easting, Northing)
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Subjects / Periods: |
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Identifiers: |
OASIS Id: |
arca1-210835 |
OBIB: |
1415-1 |
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Note: |
Report in PDF format.
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Source: |
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Relations: |
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Created Date: |
01 Feb 2018 |