For every sample recorded in FRED, two age fields are calculated automatically from all available information, namely “auto consensus-age (narrow)” and “auto consensus-age (broad)”.
If an adopted age has been entered, the narrow and broad calculated fields will both be set to the adopted age.
Otherwise, the narrow field is set to identify the minimum overlap (if overlap exists) between multiple age estimates. It is the more discriminating of the two fields – i.e., it will yield the fewest results in a search. The broad field will reflect the maximum possible range that is consistent with all age estimates and therefore “casts the widest net”. This field should be used for searches that aim to return every possible matching record.
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