User guide of BGS Seabed Geology 10k : Bristol Channel (v.2)

British Geological Survey. 2025 User guide of BGS Seabed Geology 10k : Bristol Channel (v.2). Edinburgh, UK, British Geological Survey, 28pp. (OR/25/041) (Unpublished)

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Abstract/Summary

The BGS Seabed Geology 10k: Bristol Channel (v.2) digital map comprises three complimentary components: 1) Substrate Geology, showing the distribution of Bedrock and Superficial geological units interpreted to be dominant within the top 1 m below seabed; 2) Structural Geology, delineating the principle structural features such as faults and folds observed at rockhead; and 3) Seabed Geomorphology, classifying the physical morphology and interpreted geomorphic character of the seabed. This geospatial product is the result of analysing, interpreting, and classifying a number of high-resolution, multibeam echo-sounder (MBES) bathymetry datasets, supported by further data and information, e.g., MBES backscatter, physical samples (e.g., grabs, cores, and boreholes), seismic data, academic and publicly accessible industry literature, and previous BGS mapping (e.g.,1:250k maps). The bedrock geology comprises Palaeozoic and Mesozoic sedimentary rocks, often significantly fractured and faulted, with bedrock outcropping widely at seabed across the central axis of the Bristol Channel, as well as on bathymetric highs within Swansea Bay, and the areas west of Carmarthen Bay towards St. Govan’s Head. Mapped superficial deposits include marine Sands, Gravels, and Muds, potentially underlain by further Quaternary deposits in places (e.g. Swansea Bay). The Seabed Geomorphology records a range of relict features and active processes, including: Palaeochannels and Palaeoshorelines that are associated with the development of the palaeo Severn. Numerous landforms are mapped, e.g., Negative and Positive Lineaments associated with tidal scour, and several arcuate Ridges that are potentially indicative of past glacial processes. Active marine sedimentary features include numerous current-induced Bedforms and several large Sediment Banks associated with adjacent coastal headlands. The dataset citation, metadata and overview can be found here: British Geological Survey (2025): BGS Seabed Geology 10k: Bristol Channel version 2.0. British Geological Survey. OR/25/041. https://doi.org/10.5285/f7816c02-4e24-4563-988d-b4678115052a. The information provided in this user guide is intended to provide a quick-start guide to using and understanding this BGS digital product.

Item Type:	Publication - Report
Funders/Sponsors:	British Geological Survey
Additional Information:	This item has been internally reviewed, but not externally peer-reviewed.
Date made live:	18 Sep 2025 17:32 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/540243

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