BGS Hosted Metadata
1:250K Geological Maps of Northern Ireland version 2
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 These data are generalised and superseded by the 1:10k Geological Maps of Northern Ireland.
Simple
Identification info
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Date (Publication)
- 1997
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Status
- Point of contact
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Role Organisation Electronic mail address Point of contactBritish Geological Survey
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Spatial representation type
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Vector
Spatial resolution
Equivalent scale
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Denominator
- 250000
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Topic category
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Environment
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Geoscientific information
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Extent
Temporal extent
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Time period
- 1991-01-01 1997-01-01
Extent
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Extent
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Maintenance and update frequency
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As needed
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Theme
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Geology
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Place
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World
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Resource constraints
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Access constraints
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Unrestricted
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Use constraints
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Unrestricted
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Other constraints
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The dataset is made freely available for access, e.g. via the Internet. Either no third party data / information is contained in the dataset or BGS has secured written permission from the owner(s) of any third party data / information contained in the dataset to make the dataset freely accessible.
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]"
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Language
- English
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Character encoding
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UTF8
Resource lineage
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Statement
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Recorded and digitised as necessary from 250k published GSNI maps. Data created and exported as V1 in Irish National Grid December 2000.
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Hierarchy level
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Dataset
Reference System Information
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Reference system identifier
- WGS 1984
Metadata
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Metadata identifier
- urn:uuid/9a36acc5-ab1b-4cf8-b6fc-8de59bd5eeb7
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Language
- English
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Character encoding
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anyValidURI
- Contact
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Role Organisation Electronic mail address Point of contact
Type of resource
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Resource type
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Dataset
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Date info (Creation)
- 2026-01-19T15:02:13.260933Z
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Date info (Creation)
- 2025-02-28T15:02:37.759434Z
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Date info (Revision)
- 2026-01-19T15:20:08.503662Z
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Date info (Creation)
- 2005-03-31T19:13:30
Metadata standard
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Title
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ISO 19115-3
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