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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
401	TE	DARRIWILIAN	AGE	Darriwilian Age	460.9	468.1	DEFINITE	1.6	DEFINITE	1.6		C	TMCM	22-SEP-09
402	TI	DAPINGIAN	AGE	Dapingian Age	468.1	471.8	DEFINITE	1.6	DEFINITE	1.6		C	TMCM	22-SEP-09
403	TL	FLOIAN	AGE	Floian Age	471.8	478.6	DEFINITE	1.6	DEFINITE	1.7		C	TMCM	22-SEP-09
404	TM	TREMADOCIAN	AGE	Tremadocian Age	478.6	488.3	DEFINITE	1.7	DEFINITE	1.7		C	TMCM	22-SEP-09
405	TN	ASHGILL	EPOCH	Ashgill Epoch	443.7	451	DEFINITE	1.5	INTERP	0	British regional epoch.	C	TMCM	22-SEP-09
406	TO	CAUTLEYAN	AGE	Cautleyan Age	447	449	INTERP	0	INTERP	0	Not on 2009 BGS Geological Time Chart but retained for use.	C	TMCM	22-SEP-09
407	TR	PUSGILLIAN	AGE	Pusgillian Age	449	451	INTERP	0	INTERP	0	Not on 2009 BGS Geological Time Chart but retained for use.	C	TMCM	22-SEP-09
408	TU	CARADOC	EPOCH	Caradoc Epoch	451	460.9	INTERP	0	DEFINITE	1.6	British regional epoch.	C	TMCM	22-SEP-09
409	XR	STREFFORDIAN	AGE	Streffordian Age	451	453	INTERP	0	INTERP	0	Not on 2009 BGS Geological Time Chart but retained for use.	C	TMCM	22-SEP-09
410	XX	ACTONIAN	SUB-AGE	Actonian Sub-age	452	453	INTERP	0	INTERP	0	Not on 2009 BGS Geological Time Chart but retained for use.	C	TMCM	22-SEP-09

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