BGS Seabed Geology 10k: Anglesey version 1.0
The BGS Seabed Geology 10k: Anglesey digital map portrays the distribution of the different types of bedrock and sediments that are interpreted to represent the dominant geology within to the top 1-2 metres of the seabed to the north-west of Anglesey, at a scale of 1:10 000. It also includes the distribution of the main seabed morphological and geomorphological features (e.g. drumlins, sandwaves) and the principal structural features observed at rockhead (fractures). This digital map is the result of the interpretation of two high-resolution, multibeam echo-sounder (MBES) bathymetry datasets: (i) the Off Skerries HI1420 survey, collected by Net Survey in 2013 as part of the Civil Hydrography Programme (CHP) surveys managed by the Maritime and Coastguard Agency (MCA) for the UK Hydrographic Office; and (ii) the North St George’s Channel candidate Marine Conservation Zone (rMCZ) survey, collected jointly by JNCC and Cefas in 2012 for the Department for Environment, Food and Rural Affairs (Defra). MBES backscatter, physical samples (e.g. grabs, cores, and boreholes), academic papers and previous BGS geological interpretations at broader scales (250k and 50k scales) were used to further inform this geological interpretation. The bedrock is divided into three units: (i) Neoproterozoic to Palaeozoic age metamudstones and metasandstones of the Monian Supergroup; (ii) undifferentiated Lower Palaeozoic age rocks (mudstone, volcaniclastics, siltstone, slate); and (iii) limestone and sandstone of the Carboniferous Limestone Supergroup. The superficial deposits are composed of various types of glacial sediments (e.g. glacial till and morainic deposits) that were deposited underneath and around the margins of the last British-Irish Ice Sheet in the area, and also more recently deposited marine sediments.
dataset
:
http://data.bgs.ac.uk/id/dataHolding/13607968
English
Geoscientific information
GEMET - INSPIRE themes, version 1.0:
BGS Thesaurus of Geosciences:
UK Location (INSPIRE)
Geomorphology
Mapping
Bed rock
Sea floor
Structural geology
Geology
Surficial geology
Free:
Free:
NERC_DDC
-5.3300,
53.1600,
-4.4900,
53.6900
IRISH SEA [id=2001430]
creation: 2022-08
unknown
-
before
vector
British Geological Survey
Enquiries
The Lyell Centre, Research Avenue South,
EDINBURGH,
EH14 4AP,
United Kingdom
tel: 0115 936 3142
email:
enquiries@bgs.ac.uk
Role: distributor
British Geological Survey
Enquiries
The Lyell Centre, Research Avenue South,
EDINBURGH,
EH14 4AP,
United Kingdom
tel: 0115 936 3142
email:
enquiries@bgs.ac.uk
Role: point of contact
Data Quality
The delineation and classification of the geological substrate units were based primarily on what can be observed and interpreted from the multibeam echo-sounder (MBES) bathymetry data collected during the Civil Hydrography Programme (CHP) surveys managed by the Maritime and Coastguard Agency (MCA) and a candidate Marine Conservation Zone (MCZ) survey for the Department for Environment, Food and Rural Affairs (Defra). The two survey areas mapped were: • HI1420 – Off Skerries TSS Blk A-E 4m SB (2013) • 118503 North St Georges Channel MCZ 4m SB (2012) MBES backscatter, physical samples (e.g. grabs, cores, and boreholes) and previous geological mapping were also used to further inform the geological interpretation. The geological interpretation was undertaken in 2020-2021, by A. Finlayson, E. Phillips, R. Kendall, G. Carter and J. Everest in an ESRI ArcGIS project using the BGS SIGMA Desktop application. The geological linework was captured 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/22/059.
INSPIRE Implementing rules laying down technical arrangements for the interoperability and harmonisation of Geology
Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services
Constraints
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.
Available under the Open Government Licence subject to the following acknowledgement accompanying the reproduced NERC materials "Contains NERC materials ©NERC [year]"
licenceOGL
Metadata about metadata
e7aee2db-79aa-2244-e053-0937940a6829
British Geological Survey
The Lyell Centre, Research Avenue South,
EDINBURGH,
EH14 4AP,
United Kingdom
tel: +44 131 667 1000
email:
enquiries@bgs.ac.uk
Role: point of contact
2024-04-24