National Geochronological Database

Radiometric and fission-track age determinations of geologic materials from the continental US and Alaska

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Continental US	Alaska

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Geographic information system: geochron.zip: Shapefile, 2.8 MB expands to 56 MB

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geochron-gdb.zip: File geodatabase, 3 MB expands to 18 MB

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Spreadsheets or relational database: geochron-csv.zip: Comma-delimited text, 1.8 MB zipped, expands to 14 MB

All records, all tables. See data dictionary for explanation of tables and fields.

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About the database fields

Publication:

USGS Open-File Report 2003-236: National Geochronological Database
http://geopubs.wr.usgs.gov/open-file/of03-236/

Mineral Resources Eastern Central Western Alaska Minerals Information
Spatial Data Crustal Geophysics and Geochemistry Other Mineral Related Links