Identification

Title

1:250K Geological Maps of Northern Ireland version 2

Abstract

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 These data are generalised and superseded by the 1:10k Geological Maps of Northern Ireland.

Resource type

dataset

Resource locator

https://www.opendatani.gov.uk/dataset/gsni-250k-geology

name: Open Data NI

function: download

http://mapapps2.bgs.ac.uk/GSNI_Geoindex/home.html

name: GSNI GeoIndex - Homepage

function: search

Unique resource identifier

code

http://data.bgs.ac.uk/id/dataHolding/13605376

codeSpace

Dataset language

eng

Spatial reference system

code identifying the spatial reference system

Classification of spatial data and services

Topic category

geoscientificInformation

Keywords

Keyword set

keyword value

originating controlled vocabulary

title

reference date

date type

publication

effective date

2008-06-01

Keyword set

keyword value

Geology

Maps

UK Location (INSPIRE)

originating controlled vocabulary

title

reference date

date type

revision

effective date

2022

Keyword set

keyword value

Keyword set

keyword value

NERC_DDC

Geographic location

West bounding longitude

-8.3000

East bounding longitude

-5.2000

North bounding latitude

55.3000

South bounding latitude

54.0000

Extent

Extent group

authority code

title

reference date

date type

revision

effective date

2009

code identifying the extent

NIR

Extent group

authority code

title

reference date

date type

creation

effective date

1979

code identifying the extent

NORTHERN IRELAND [id=181000]

Temporal reference

Temporal extent

Begin position

1991

End position

1997

Dataset reference date

date type

publication

effective date

1997

Frequency of update

asNeeded

Quality and validity

Lineage

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.

Conformity

Conformity report

specification

title

reference date

date type

publication

effective date

2011

degree

false

explanation

See the referenced specification

Conformity report

specification

title

reference date

date type

publication

effective date

2010-12-08

degree

false

explanation

See http://eur-lex.europa.eu/LexUriServ/LexUriServ.do?uri=OJ:L:2010:323:0011:0102:EN:PDF

Data format

name of format

VECTOR - SHP

version of format

Constraints related to access and use

Constraint set

Limitations on public access

Constraint set

Limitations on public access

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.

Responsible organisations

Responsible party

organisation name

British Geological Survey

full postal address

Dundonald House, Upper Newtownards Road

BELFAST

BT4 3SB

United Kingdom

telephone number

028 9038 8462

facsimile number

028 9038 8461

email address

gsni@economy-ni.gov.uk

responsible party role

distributor

Responsible party

organisation name

British Geological Survey

full postal address

Dundonald House, Upper Newtownards Road

BELFAST

BT4 3SB

United Kingdom

telephone number

028 9038 8462

facsimile number

028 9038 8461

email address

gsni@economy-ni.gov.uk

responsible party role

pointOfContact

Metadata on metadata

Metadata point of contact

organisation name

British Geological Survey

full postal address

Dundonald House, Upper Newtownards Road

BELFAST

BT4 3SB

United Kingdom

telephone number

+44 28 9038 8462

email address

gsni@detini.gov.uk

responsible party role

pointOfContact

Metadata date

2024-04-04

Metadata language