Digital geochronological index

Dataset description

A digital geochronological index to act as a domain constraint for geochronology columns in corporate data tables. It decodes geochronology codes, models pseudo parent-child relationships between intervals (for example, find the epochs within a given period), allows range searches (for example, find the epochs between lower limiting and upper limiting epochs) and provides radiometric ages with ranges of uncertainty. Follows the recommendations of the BGS Stratigraphy Committee. Phanerozoic after Gradstein and Ogg (1996), with the Ordovician scheme of Fortey et al. (1995); Proterozoic after Cowie and Bassett (1989); Archaean after an unpublished decision of the Precambrian Subcommission of the IUGS. Covers the whole of geological time. Geochronological resolution usually to age level. Lower resolution in the Archaean, Proterozoic, Cambrian. Greater resolution in the Caradoc Epoch.


Use must be acknowledged.

Further information

For more information please contact:


Environmental Science Centre, Nicker Hill, Keyworth
NG12 5GG

Tel : +44 (0)115 936 3143
Fax :+44 (0)115 936 3276


Dataset details

Author(s) Not available
Principal Investigator(s) Not available
Language English
Curator British Geological Survey
Supply media/format ORACLE - Used as a domain constraint on corporate data tables; Version:
Storage format Digital:Oracle Relational Database
Frequency of update not planned
Start of capture {ts '2002-01-25 00:00:00'} 25th January 2002
End of capture {ts '2014-01-01 00:00:00'} Before January 2014
Contact details
Department Enquiries
Organisation British Geological Survey
Address Environmental Science Centre, Nicker Hill, Keyworth
City Nottingham
County Nottinghamshire
Country United Kingdom
Postcode NG12 5GG
Telephone +44 (0)115 936 3143
Fax +44 (0)115 936 3276
Topic category code (ISO) geoscientificInformation (information pertaining to earth sciences)
Keyword source BGS Keyphrases
Spatial details
Spatial Reference System Not available
Dataset extent
Coverage (Lat/Long) North boundary : 
East boundary  : 
South boundary : 
West boundary  : 
Metadata language English
Metadata last updated 17th January 2014
Metadata standard compliance NERC profile of ISO19115:2003
Copyright and IPR
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.