The geochronology dataset contains seven feature classes pertaining to age determinations and (or) estimates for rocks and deposits in Washington State, including argon, uranium, radiocarbon, luminescence, fission-track, fossil, and other radiometric analyses. Data were compiled from several databases, including 1:100,000-scale geologic data published by the Washington Geological Survey (2010), the National Geochronologic Database published by the U.S. Geologic Survey (Sloan and others, 2003), and an unpublished database for the Puget Lowland developed and provided by Kathy Troost of the University of Washington. In addition, hundreds of analyses were compiled from individual published and unpublished sources.

The geochronology dataset contains seven feature classes pertaining to age determinations and (or) estimates for rocks and deposits in Washington State, including argon, uranium, radiocarbon, luminescence, fission-track, fossil, and other radiometric analyses. Data were compiled from several databases, including 1:100,000-scale geologic data published by the Washington Geological Survey (2010), the National Geochronologic Database published by the U.S. Geologic Survey (Sloan and others, 2003), and an unpublished database for the Puget Lowland developed and provided by Kathy Troost of the University of Washington. In addition, hundreds of analyses were compiled from individual published and unpublished sources.