National Geochronological Database

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

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https://mrdata.usgs.gov/services/geochron (WMS, version 1.3.0)

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geochron.zip (Shapefile 2.8 M bytes)

geochron-gdb.zip (File geodatabase 3.0 M bytes)

geochron-csv.zip (Comma-delimited text 1.8 M bytes)

Documentation

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Outline - Questions & Answers - Plain text - XML

About the database tables and fields

All database fields, by category