<?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>D.A. Leich</dc:contributor>
  <dc:contributor>T.A. Tombrello</dc:contributor>
  <dc:contributor>J.E. Ericson</dc:contributor>
  <dc:contributor>I. Friedman</dc:contributor>
  <dc:creator>R.R. Lee</dc:creator>
  <dc:date>1974</dc:date>
  <dc:description>&lt;div id="Abs1-section" class="c-article-section"&gt;&lt;div id="Abs1-content" class="c-article-section__content"&gt;&lt;p&gt;AMBIENT water diffuses into the exposed surfaces of obsidian, forming a hydration layer which increases in thickness with time to a maximum depth of 20–40 µm (ref. 1), this layer being the basic foundation of obsidian dating&lt;sup&gt;2,3&lt;/sup&gt;.&lt;/p&gt;&lt;/div&gt;&lt;/div&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1038/250044a0</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Nature</dc:publisher>
  <dc:title>Obsidian hydration profile measurements using a nuclear reaction technique</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>