4 rows


This table stores metadata for Aggregate Chronologies. An Aggregate Chronology refers to an explicit chronology assigned to a sample Aggregate. The individual Aggregate Samples have ages assigned in the AggregateSampleAges table. An Aggregate Chronology would be used, for example, for a set of packrat middens assigned to an AggregateDataset. The Aggregate Chronology is analogous to the Chronology assigned to samples from a single Collection Unit.
An Aggregate may have more than one Aggregate Chronology, for example one in radiocarbon years and another in calibrated radiocarbon years. One Aggregate Chronology per Age Type may be designated the default, which is the Aggregate Chronology currently preferred by the database stewards.


Column Type Size Nulls Auto Default Children Parents Comments
aggregatechronid serial 10 nextval('ndb.seq_aggregatechronologies_aggregatechronid'::regclass)
aggregatesampleages.aggregatechronid fk_aggregatesampleages_aggregatechronologiesR

PK: An arbitrary Aggregate Chronology identification number

aggregatedatasetid int4 10 null
aggregatedatasets.aggregatedatasetid fk_aggregatechronologies_aggregatedatasetsC

FK: Links to AggregateDatasets table

agetypeid int4 10 null
agetypes.agetypeid fk_aggregatechronologies_agetypesC

FK: Links to AgeTypes table

isdefault bool 1 null

Indicates whether the Aggregate Chronology is a default or not. Datasets may have more than one default Aggregate Chronology, but may have only one default Aggregate Chronology per Age Type.

chronologyname varchar 80 null

Optional name for the Chronology

ageboundyounger int4 10 null

The younger reliable age bound for the Aggregate Chronology

ageboundolder int4 10 null

The older reliable age bound for the Aggregate Chronology

notes text 2147483647 null

Free form notes or comments about the Aggregate Chronology

recdatecreated timestamp 22 timezone('UTC'::text, now())
recdatemodified timestamp 22 null


Constraint Name Type Sort Column(s)
aggregatechronologies_pkey Primary key Asc aggregatechronid