K/Ar ages from the National Geochronological Database

A subset of the National Geochronological Database as of 1995. Shows the distribution of published K/Ar and Ar/Ar age determinations in the US. Sample location, rock description, analytical data, age, interpretation, and bibliographic reference are given.

• Database documentation (metadata)
• About the database fields
  • All database fields, by category
  • Database field categories
  • Alphabetical listing of database fields
• Select data by geographic area
• Download the entire dataset (1 Mb zipped shapefile expands to 39 Mb)