tbl_locality_age_cache	
locality_id	the internal id number used by MED to identify this locality, used especially when mid-level locality does not have a mindat_id (CAUTION: this number is not permanent, and can change whenever MED is updated with new mindat data)
mindat_id	the number that mindat uses to identify this locality
mineral_id	id number that links to rruff.info mineral
at_locality	value = "1" if mineral exists at the locality according to mindat, i.e. it has not been passed up the locality hierarchy.
is_remote	value = "1" if age is passed to the minerals' locality from another locality, i.e. the locality is not directly dated
age_type	letter that represents the "goodness" or confidence of the age assigned to the mineral at the locality. These are the color codes as seen on the MED.
is_legit_age	value = "1" when the mineral occurs directly at the locality according to mindat or if there exists an age at the locality not originating from a lower level locality. i.e. is_legit_age == "1" WHEN (at_locality == "1") OR (max_age is not blank AND age_type != "P")
max_age	Oldest possible age (based on available data) for mineral at the locality
max_age_excel_id	id number that links to the age data used for the oldest possible age
max_age_ref_id	reference id number for the age used for oldest possible age
min_age	minimum possible age (based on available data) for the mineral at the locality
min_age_excel_id	id number that links to the age data used for the youngest possible age
min_age_ref_id	reference id number for the age used for youngest possible age
dated_locality_mindat_id	mindat id number for the locality that was directly dated