OA Library

Severnside West Pipeline Diversion, South Gloucestershire

Champness, Carl Severnside West Pipeline Diversion, South Gloucestershire. [Client Report] (Unpublished)

[img]
Preview
PDF
BRSMG_2015_11.pdf

5MB

Abstract

In June 2015 Oxford Archaeology undertook an archaeological evaluation along the route of the proposed Severnside Pipeline Diversion, South Gloucestershire. The work was commissioned by Jacobs on behalf of the National Grid. The primary purpose of the evaluation was to assess the archaeological potential of the route of the proposed pipeline diversion. The site lies upon extensive estuarine alluvial deposits known as the Wentlooge Formation, which underlie large areas of both the English and Welsh sides of the Severn Estuary. In the Enron site to the south, a thin peat layer containing a comminuted charcoal in-wash was radiocarbon dated to the early Bronze Age. Although no evidence of human activity accompanied this deposit, previous work to the north-east of the site had provided evidence of Romano-British settlement. A geophysical survey was undertaken prior to the intrusive works that suggested low archaeological potential, with mainly services and geological changes revealed. The archaeological evaluation comprised the mechanical excavation of 20 trenches measuring 30m by 2m, comprising a 4% sample of the proposed route. The trenches were positioned to investigate the results of the geophysical survey and to investigate areas that had been unavailable at the time of the survey. In addition, four geoarchaeological test pits were excavated within the trenches, and four boreholes, in order to map the underlying sediments and to investigate the presence/extent of any charcoal and peat layers. Several undated ditches were identified in the north-west area of the route and have been interpreted as drainage ditches associated with post-medieval cultivation. The remaining trenches were devoid of archaeological remains and only ceramic land drains and clearly modern features were recorded. The geoarchaeological test pits and boreholes showed an alluvial sequence across the route consistent with the Middle to Upper Wentlooge Formation. A layer corresponding precisely with a charcoal layer previously found to the south was mapped across the area. The layer is interpreted as a humified incipient vegetation layer, which in the west and south of the site was very dark and contained microscopic charcoal (but no in situ burning), whilst further east the layer became more humic and peaty. No archaeological finds or features were found in association with this layer. Based on the result of the evaluation, the archaeological and palaeoenvironmental impact of the proposed pipeline diversion is considered to be low.

Item Type:Client Report
Subjects:Geographical Areas > English Counties > South Gloucestershire
ID Code:4098
Deposited By: Scott
Deposited On:01 Aug 2018 06:33
Last Modified:01 Aug 2018 06:33

Repository Staff Only: item control page