This product contains over 1500 age determinations derived from over 1100 rock samples from the Yukon Territory in a searchable, relational-database format. The age determinations are taken from published and unpublished reports, including theses, and further include some otherwise unreported age determinations (those that have been made available and authorized for release by individual workers). Age determinations may be queried by the user on the basis absolute age (in Ma), location (NTS map sheet, latitute/longitude or UTM constraint specified by user) or by source (e.g., author, journal title, etc.). The data product is in Microsoft Access 2000 format; the user will require this software in order to utilize the database. A flatfile of all the data, and of the data sources, has been included (Microsoft Excel 2000 format) so that the data may be viewed without Microsoft Access; these files do not contain the full range of detail available for the data, nor does a flatfile format lend itself to querying and exporting data records. The sources flatfile is useful for those users wishing to import this information into a reference-based program, such as Endnote.