9df8df52-d781-37a8-e044-0003ba9b0d98 English dataset British Geological Survey +44 28 9038 8462 Dundonald House, Upper Newtownards Road BELFAST BT4 3SB United Kingdom gsni@detini.gov.uk pointOfContact 2026-04-16 UK GEMINI 2.3 http://data.bgs.ac.uk/id/dataHolding/13605376 OSNI 1952 / Irish National Grid (EPSG::29901) TM65 / Irish Grid (EPSG::29902) 1:250K Geological Maps of Northern Ireland version 2 1997 publication http://data.bgs.ac.uk/id/dataHolding/13605376 The 1:250k Geological Maps of Northern Ireland comprise the Superficial Deposits Map (Drift, 1991) and the Bedrock Map (Solid Geology, 1997). These maps identify landscape areas based on their lithology. The scale of the maps is 1:250 000 and provides a simplified interpretation of the geology that may be used as a guide at a regional level, but should not be relied on for local geology. Superficial deposits are younger geological deposits formed during the most recent geological time; the Quaternary. These deposits rest on older rocks or deposits referred to as bedrock. The superficial deposits theme defines landscape areas with a geological name and their deposit-type or lithological composition. The Superficial map shows the deposits within the extent of the six Counties of Northern Ireland. The Bedrock map comprises the bedrock geology and contains dykes and geological faults. Bedrock geology describes the main mass of solid rocks forming the earth's crust. Bedrock is present everywhere, whether exposed at surface in outcrops or concealed beneath superficial deposits or water bodies. Geological names are based on the lithostratigraphic or lithodemic hierarchy of the rocks. The lithostratigraphic scheme arranges rock bodies into units based on rock-type and geological time of formation. Where rock-types do not fit into the lithostratigraphic scheme, for example intrusive, deformed rocks subjected to heat and pressure resulting in new or changed rock types; then their classification is based on their rock-type or lithological composition. This assesses visible features such as texture, structure, mineralogy. Dykes defines small, narrow areas of a specific type of bedrock geology; that is igneous rocks which have been intruded into the landscape at a later date than the surrounding bedrock. Geological faults occur where a body of bedrock has been fractured and displaced by large scale processes affecting the earth's crust (tectonic forces). The Bedrock map shows the main bedrock geological divisions in Northern Ireland and coverage extends to the west into the Republic of Ireland. The printed map includes a stratigraphic column. Digital datasets have been derived from the maps and comprise three layers. 1. Superficial polygons, 2. Bedrock polygons and 3. Linear features. Attribute tables describe the polygon features. These data are generalised and superseded by the 1:10k Geological Maps of Northern Ireland. Enquiries British Geological Survey 028 9038 8462 028 9038 8461 Dundonald House, Upper Newtownards Road BELFAST BT4 3SB United Kingdom gsni@economy-ni.gov.uk distributor Enquiries British Geological Survey 028 9038 8462 028 9038 8461 Dundonald House, Upper Newtownards Road BELFAST BT4 3SB United Kingdom gsni@economy-ni.gov.uk pointOfContact asNeeded https://resources.bgs.ac.uk/images/geonetworkThumbs/9df8df52-d781-37a8-e044-0003ba9b0d98.png Geology GEMET - INSPIRE themes, version 1.0 2008-06-01 publication Geology Maps BGS Thesaurus of Geosciences 2022 revision UK Location (INSPIRE) dataCentre NERC_DDC otherRestrictions Crown Copyright – provided under the Open Government Licence V3. otherRestrictions 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. Either: (i) the dataset is made freely available, e.g. via the Internet, for a restricted category of use (e.g. educational use only); or (ii) the dataset has not been formally approved by BGS for access and use by external clients under licence, but its use may be permitted under alternative formal arrangements; or (iii) the dataset contains 3rd party data or information obtained by BGS under terms and conditions that must be consulted in order to determine the permitted usage of the dataset. Refer to the BGS staff member responsible for the creation of the dataset if further advice is required. He / she should be familiar with the composition of the dataset, particularly with regard to 3rd party IPR contained in it, and any resultant use restrictions. This staff member should revert to the IPR Section (ipr@bgs.ac.uk) for advice, should the position not be clear. vector 250000 English geoscientificInformation ISO 3166_1 alpha-3 2009 revision NIR British Geological Survey Gazetteer: Geographical hierarchy from Geosaurus 1979 creation NORTHERN IRELAND [id=181000] -8.3000 -5.2000 54.0000 55.3000 1991 1997 ESRI Shapefile 1994 TAB witheld Printed paper maps OGC GeoPackage (GPKG) Image (TIFF) Enquiries British Geological Survey 028 9038 8462 028 9038 8461 Dundonald House, Upper Newtownards Road BELFAST BT4 3SB United Kingdom gsni@economy-ni.gov.uk distributor https://www.opendatani.gov.uk/dataset/gsni-250k-geology WWW:DOWNLOAD-1.0-http--download OpenDataNI: GSNI 250K Geology A 1:250,000 map showing the main geological bedrock divisions in Northern Ireland. The data comprises the bedrock geology, which represents the outcrops (at surface) and subcrops (at near-surface, beneath superficial deposits) in Northern Ireland. download https://mapapps2.bgs.ac.uk/GSNI_Geoindex/home.html WWW:LINK-1.0-http--link GSNI GeoIndex search dataset dataset INSPIRE Implementing rules laying down technical arrangements for the interoperability and harmonisation of Geology 2011 publication See the referenced specification false 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 2010-12-08 publication See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF false The 1:250k Superficial Geological Map of Northern Ireland was compiled by the Geological Survey of Northern Ireland and published in 1991. The 1:250K Bedrock Geology map of Northern Ireland was compiled by the Geological Survey of Northern Ireland and published in 1997. The map was compiled from larger scale maps and may involve some generalization of the geology. It was in part derived from the 1:63 360 and 1:50 000 maps of the Geological Survey of Northern Ireland and the 1:100 000 maps of the Geological Survey of Ireland. Additional information was provided by University of St Andrews, University of Birmingham, The Queen’s University of Belfast and the University of Sheffield. Digital datasets were digitised from the published maps in December 2000. Revised for positional accuracy in September 2009.