<?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>W. Kenneth Hamblin</dc:contributor>
  <dc:contributor>P.E. Damon</dc:contributor>
  <dc:creator>Edwin D. McKee</dc:creator>
  <dc:date>1968</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;The&amp;nbsp;&lt;/span&gt;K&lt;span&gt;-&lt;/span&gt;Ar&lt;span&gt;&amp;nbsp;&lt;/span&gt;age&lt;span&gt;&amp;nbsp;of the basal basalt flow at the bottom of the "Lower&amp;nbsp;&lt;/span&gt;Canyon&lt;span&gt;&amp;nbsp;group" of lavas near Toroweap fault is 1.16 ± 0.18 standard deviation (sd) m.y. This represents a minimum&amp;nbsp;&lt;/span&gt;age&lt;span&gt;&amp;nbsp;of&amp;nbsp;&lt;/span&gt;Grand&lt;span&gt;&amp;nbsp;&lt;/span&gt;Canyon&lt;span&gt;, for at the time the&amp;nbsp;&lt;/span&gt;lava&lt;span&gt;&amp;nbsp;formed, the&amp;nbsp;&lt;/span&gt;canyon&lt;span&gt;&amp;nbsp;was essentially as deep as it is today. Since that time the Colorado River has cut through the 550-ft&amp;nbsp;&lt;/span&gt;lava&lt;span&gt;&amp;nbsp;&lt;/span&gt;dam&lt;span&gt;&amp;nbsp;at the mouth of Toroweap Valley, an additional 50 ft of Paleozoic strata below, and through one or more younger&amp;nbsp;&lt;/span&gt;lava&lt;span&gt;&amp;nbsp;dams&amp;nbsp;&lt;/span&gt;in&lt;span&gt;&amp;nbsp;the area; downstream it has cut through 100 feet of younger intracanyon lavas.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1130/0016-7606(1968)79[133:KAOLDI]2.0.CO;2</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Geological Society of America</dc:publisher>
  <dc:title>K-Ar age of lava dam in Grand Canyon</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>