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DIC_GEOCHRON (410 rows)
Dictionary table holding codes, names and radiometric ages of geochronological intervals that can be used in BGS databases. It is this table that acts as the domain constraint on corporate data tables.


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Row CODE DESCRIPTION RANK_CODE TRANSLATION MIN_AGE MAX_AGE MIN_AGE_TYPE_CODE MIN_AGE_PLUS_OR_MINUS MAX_AGE_TYPE_CODE MAX_AGE_PLUS_OR_MINUS COMMENTS STATUS USER_ENTERED DATE_ENTERED USER_UPDATED DATE_UPDATED
11 AH  ABEREIDDIAN  AGE  Abereiddian Age  464  467  INTERP  INTERP  Not on 2009 BGS Geological Time Chart but retained for use.  TMCM  22-SEP-09     
12 AI  ARENIG  EPOCH  Arenig Epoch  467  478.6  INTERP  DEFINITE  1.7  British regional epoch.  TMCM  22-SEP-09     
13 AL  FENNIAN  AGE  Fennian Age  467  471  INTERP  INTERP  Not on 2009 BGS Geological Time Chart but retained for use.  TMCM  22-SEP-09     
14 AM  WHITLANDIAN  AGE  Whitlandian Age  471  475  INTERP  INTERP  Not on 2009 BGS Geological Time Chart but retained for use.  TMCM  22-SEP-09     
15 AN  MORIDUNIAN  AGE  Moridunian Age  475  478.6  INTERP  DEFINITE  1.7  Not on 2009 BGS Geological Time Chart but retained for use.  TMCM  22-SEP-09     
16 AO  TREMADOC  EPOCH  Tremadoc Epoch  478.6  488.3  DEFINITE  1.7  DEFINITE  1.7  British regional epoch.  TMCM  22-SEP-09     
17 AP  CAMBRIAN  PERIOD  Cambrian Period  488.3  542  DEFINITE  1.7  DEFINITE    TMCM  22-SEP-09     
18 AQ  FURONGIAN  EPOCH  Furongian Epoch  488.3  501  DEFINITE  1.7  DEFINITE    TMCM  22-SEP-09     
19 AR  CAMBRIAN STAGE 10  AGE  Cambrian Stage 10  488.3  492  DEFINITE  1.7  APPROX    TMCM  22-SEP-09     
20 AS  CAMBRIAN STAGE 9  AGE  Cambrian Stage 9  492  496  APPROX  APPROX    TMCM  22-SEP-09     
21 AT  PAIBIAN  AGE  Paibian Age  496  501  APPROX  DEFINITE    TMCM  22-SEP-09     
22 AX  CAMBRIAN SERIES 3  EPOCH  Cambrian Series 3  501  510  DEFINITE  APPROX    TMCM  22-SEP-09     
23 AY  GUZHANGIAN  AGE  Guzhangian Age  501  503  DEFINITE  APPROX    TMCM  22-SEP-09     
24 AZ  DRUMIAN  AGE  Drumian Age  503  506.5  APPROX  APPROX    TMCM  22-SEP-09     
25 BB  CAMBRIAN SERIES 2  EPOCH  Cambrian Series 2  510  521  APPROX  APPROX    TMCM  22-SEP-09     
26 BC  CAMBRIAN STAGE 4  AGE  Cambrian Stage 4  510  517  APPROX  APPROX    TMCM  22-SEP-09     
27 BD  CAMBRIAN STAGE 3  AGE  Cambrian Stage 3  517  521  APPROX  APPROX    TMCM  22-SEP-09     
28 BE  CAMBRIAN STAGE 2  AGE  Cambrian Stage 2  521  534.6  APPROX  APPROX    TMCM  22-SEP-09     
29 BH  FORTUNIAN  AGE  Fortunian Age  534.6  542  APPROX  DEFINITE    TMCM  22-SEP-09     
30 BI  MERIONETH  EPOCH  Merioneth Epoch  488.3  502  DEFINITE  1.7  INTERP  British regional epoch.  TMCM  22-SEP-09     

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