<?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>B. Voight</dc:contributor>
  <dc:creator>Jon J. Major</dc:creator>
  <dc:date>1986</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;Three&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;lahars&lt;/span&gt;&lt;span&gt;&amp;nbsp;that resulted from the flow transformation of an inflated pyroclastic surge caused by ejected lithic debris and hydrothermal water during the cataclysmic&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;Mount&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;St&lt;/span&gt;&lt;span&gt;.&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;Helens&lt;/span&gt;&lt;span&gt;&amp;nbsp;eruption of&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;18&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;May&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;1980&lt;/span&gt;&lt;span&gt;&amp;nbsp;deposited about 1 x 10&lt;/span&gt;&lt;sup&gt;6&lt;/sup&gt;&lt;span&gt;&amp;nbsp;m&lt;/span&gt;&lt;sup&gt;3&lt;/sup&gt;&lt;span&gt;&amp;nbsp;of massive, poorly sorted, poorly graded volcaniclastic sediment on the SW&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;flank&lt;/span&gt;&lt;span&gt;&amp;nbsp;(SWF). Downflow changes in mean grain size and sorting occur only in the coarse fraction of the deposits larger than a critical diameter of about 4mm, and occur only in the basal portion of the deposits; both mean grain size and sorting coefficient increase slightly with distance. The deposits show weak inverse grading with respect to mean grain size and exhibit a weak trend of upwardly poorer sorting, but&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;lahar&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;clast&lt;/span&gt;&lt;span&gt;&amp;nbsp;fabric&amp;nbsp;&lt;/span&gt;&lt;span class="ScopusTermHighlight"&gt;may&lt;/span&gt;&lt;span&gt;&amp;nbsp;be more complex and variable than previously suggested.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1306/212F8A1C-2B24-11D7-8648000102C1865D</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Society for Sedimentary Geology</dc:publisher>
  <dc:title>Sedimentology and clast orientations of the 18 May 1980 southwest- flank lahars, Mount St. Helens, Washington</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>