Database fields, all categories

Sample identification
idUnique record identifier
sampleSample ID from published source. If none was given in the cited source, then a sample id was created for this database.
Geographic location
quadName of 1:250,000 scale quadrangle
latitudeLatitude in decimal degrees
longitudeLongitude in decimal degrees, west longitude negative
Processing information
methodIsotopic dating method
commentField for free text.
refReference of data sample.
Sample characteristics
rockRock name or type
mineralMineral or phase dated from sample; or denotes that date is calculated from an isochron.
Analytic result
age_myAge estimate of the sample in millions of years