<?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:creator>Priestley Toulmin III</dc:creator>
  <dc:date>1961</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;Recent&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;age&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;determinations&lt;/span&gt;&lt;span&gt;&amp;nbsp;indicate that at least two groups of "&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;alkalic&lt;/span&gt;&lt;span&gt;" igneous&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;rocks&lt;/span&gt;&lt;span&gt;&amp;nbsp;exist in&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;New&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;England&lt;/span&gt;&lt;span&gt;, with ages of about 185 and 270 million years. Because of their lithologic and geologic similarities, all these&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;rocks&lt;/span&gt;&lt;span&gt;&amp;nbsp;had previously been grouped with the White Mountains plutonic-volcanic series of&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;New&lt;/span&gt;&lt;span&gt;&amp;nbsp;Hampshire. Until reliable petrographic or geologic criteria become available for distinguishing these&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;age&lt;/span&gt;&lt;span&gt;&amp;nbsp;groups, caution should be exercised in assigning any undated body of "&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;alkalic&lt;/span&gt;&lt;span&gt;"&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;rock&lt;/span&gt;&lt;span&gt;&amp;nbsp;to one or the other group.&amp;nbsp;&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1130/0016-7606(1961)72[775:GSOLAI]2.0.CO;2</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Geological Society of America</dc:publisher>
  <dc:title>Geological significance of lead-alpha and isotopic age determinations of "alkalic" rocks of New England</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>