<?xml version='1.0' encoding='utf-8'?>
<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:contributor>Charles A. Bush</dc:contributor>
  <dc:contributor>C. C. Abston</dc:contributor>
  <dc:creator>Robert E. Zartman</dc:creator>
  <dc:date>1995</dc:date>
  <dc:description>This CD-ROM contains both the National Geochronological Data Base [NGDB] and the Natural Radioelement Data Base [NRDB]. Supporting location, geologic, and reference information is provided for both data bases. The NGDB is a compilation of more than 30,000 individual published Pb-alpha, fission-track, K-Ar, Rb-Sr, U-Th-Pb, and Sm-Nd rock and mineral ages reported on approximately 18,000 dated samples from the United States. A program is provided to search the data files by latitude and longitude, state, analytical method, and age range. The NGDB is provided as quote-comma delimited files that can be entered into most commercial spreadsheet programs. The NRDB gives gamma-ray spectrometric analyses of the natural radioelements (U, Th, and K) for more than 8500 whole-rock samples obtained under the USGS Natural Radioelement Distribution Project. A program is provided to search the data files by state, keyword, U content, Th content, and K content.</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.3133/ds14</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>The Survey ;&#13;
For sale by USGS Distribution Branch],</dc:publisher>
  <dc:title>National geochronological and natural radioelement data bases</dc:title>
  <dc:type>reports</dc:type>
</oai_dc:dc>