Mineral Resources On-Line Spatial Data

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

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Continental US	Alaska

Show in Google Earth or download KML:

• geochron.kml (uncompressed, 21 megabytes)
• geochron.kmz (compressed, 787 kilobytes)

Show in your GIS using OGC WMS:

https://mrdata.usgs.gov/services/geochron?request=GetCapabilities&service=WMS&version=1.1.1

Download:

Download data for geographic areas you choose

Search by state, sample type, or ID number

Options for downloading the entire data set depend on what software you want to use:

Geographic information system

geochron.zip: Shapefile, 2.8 MB expands to 56 MB

All records, all tables, fields longer than 255 characters truncated

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

All records, all tables

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.

Documentation:

Metadata:

[Outline] - [Questions & Answers] - [Plain text]

About the database fields

Database structure (tables and field categories)

Publication:

USGS Open-File Report 2003-236

National Geochronological Database

http://pubs.usgs.gov/of/2003/0236/

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U.S. Department of the Interior | U.S. Geological Survey
Page Contact Information: Peter Schweitzer
Page Last Modified: Wednesday, 15-Feb-2017 10:06:31 MST