BGS Seabed Geology 10k: Bristol Channel version 1.0
The Seabed Geology 10k: Bristol Channel is a digital geological map portraying the distribution of the different geological substrate units (either of bedrock or unlithified deposits) present on the seabed at a 1:10 000 scale. Additionally, to the Seabed Substrate layer, this dataset also includes i) a Geomorphology layer, revealing the presence and distribution of seabed morphological and geomorphological features and ii) a Structural Geology layer, that delineates the principal structural features observed at rockhead. The bedrock geology is divided into seven stratigraphical units: Pembroke Limestone Group (PEMB); Mercia Mudstone Group (MMG); Penarth Group (PNG); the Lias Groups' St Mary’s Well Bay (STM), Lavernock Shales (LVN) and the Porthkerry (PO) members; and the Inferior Oolite Group (INO). The Lexicon code of the stratigraphical units is provided in parentheses, as defined in the ‘BGS Lexicon of Named Rock Units’. The superficial deposits mapped are comprised of only marine sediments that were classified based on their grain size. However, Folk classification was not used to define the sediment classes. The sediments are divided into Gravel (V); Sand and Gravel (XSG); Sand (S); Sand and Mud (XSM); Mud (M); and Gravel, Sand and Mud (XVSM). The RCS code of the stratigraphical units is provided in parentheses, as defined in the ‘BGS Rock Classification Scheme’.
dataset
https://doi.org/10.5285/7e413304-4481-4009-b0cb-338dd3bce8f6
name: Digital Object Identifier (DOI)
function: information
http://mapapps2.bgs.ac.uk/geoindex_offshore/home.html?
name: Data
function: search
http://data.bgs.ac.uk/id/dataHolding/13607913
eng
geoscientificInformation
publication
2008-06-01
Marine sediments
Sea floor
UK Location (INSPIRE)
Bed rock
revision
2022
NERC_DDC
-3.9100
-2.9000
51.5200
51.2700
revision
2002
Bristol Channel [id=1237949]
2022
creation
2022-02
asNeeded
The delineation and classification of the geological substrate units were based primarily on what can be observed and interpreted from the high-resolution (2m) multibeam echo-sounder (MBES) bathymetry data collected, in 2011, during the Civil Hydrography Programme (CHP) surveys managed by the Maritime and Coastguard Agency (MCA). MBES backscatter, physical samples (e.g. grabs, cores, and boreholes) and previous geological mapping were also used to further inform the geological interpretation. In 2019, G. Carter, R. Ellen, J. Everest, R. Kendall and E. Phillips mapped the area covered by the HI1327, HI1326 and HI1325 MBES MCA surveys, with ESRI ArcGIS using the BGS SIGMA Desktop application. The geological linework was done at a scale ranging from 1:5000 to 1:7000, to ensure smooth linework when the dataset is viewed at a scale of 1:10000. Bedrock and superficial deposits were mapped into two independent SIGMA layers and later merged to create the Seabed Substrate layer included in this dataset. Additional attribute fields were added to the layers, in particular to the geomorphology, to complement the information captured automatically by the SIGMA. The methodology used is described in more detail in the user guide for this dataset (OR/22/011).
publication
2011
false
See the referenced specification
publication
2010-12-08
false
See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF
ESRI shapefiles (.shp)
The copyright of materials derived from the British Geological Survey's work is vested in the Natural Environment Research Council [NERC]. No part of this work may be reproduced or transmitted in any form or by any means, or stored in a retrieval system of any nature, without the prior permission of the copyright holder, via the BGS Intellectual Property Rights Manager. Use by customers of information provided by the BGS, is at the customer's own risk. In view of the disparate sources of information at BGS's disposal, including such material donated to BGS, that BGS accepts in good faith as being accurate, the Natural Environment Research Council (NERC) gives no warranty, expressed or implied, as to the quality or accuracy of the information supplied, or to the information's suitability for any use. NERC/BGS accepts no liability whatever in respect of loss, damage, injury or other occurence however caused.
British Geological Survey
The Lyell Centre, Research Avenue South
EDINBURGH
EH14 4AP
United Kingdom
0115 936 3142
0115 936 3276
distributor
British Geological Survey
The Lyell Centre, Research Avenue South
EDINBURGH
EH14 4AP
United Kingdom
0115 936 3142
0115 936 3276
originator
British Geological Survey
The Lyell Centre, Research Avenue South
EDINBURGH
EH14 4AP
United Kingdom
0115 936 3142
0115 936 3276
pointOfContact
British Geological Survey
The Lyell Centre, Research Avenue South
EDINBURGH
EH14 4AP
United Kingdom
+44 131 667 1000
pointOfContact
2024-04-11