<?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. A. Cobban</dc:contributor>
  <dc:creator>W. J. Kennedy</dc:creator>
  <dc:date>1997</dc:date>
  <dc:description>&lt;div class="abstract-content"&gt;&lt;div class="abstract" data-abstract-type="normal"&gt;&lt;p&gt;New collections from the Marshalltown Formation and basal Mount Laurel Sand along the Chesapeake and Delaware Canal in Delaware clarify the ammonite dating of the interval. The Marshalltown Formation yields&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="italic"&gt;Pachydiscus&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;(&lt;span class="italic"&gt;Pachydiscus&lt;/span&gt;) sp.,&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="italic"&gt;Menuites portlocki&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;(Sharpe, 1855)&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="italic"&gt;complexus&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;(Hall and Meek, 1856), a subspecies restricted to the&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="italic"&gt;Baculites gregoryensis&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;and&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="italic"&gt;Baculites scotti&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;zones in the Western Interior of the United States, and&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="italic"&gt;Didymoceras binodosum&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;(Kennedy and Cobban, 1993a) known only from the&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="italic"&gt;B. scotti&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;zone of the Western Interior and correlatives in Arkansas and Texas. The basal part of the Mount Laurel Sand contains a complex assemblage preserved as phosphatic molds:&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="italic"&gt;Nostoceras&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;(&lt;span class="italic"&gt;Nostoceras&lt;/span&gt;)&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="italic"&gt;monotuberculatum&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;Kennedy and Cobban, 1993a,&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="italic"&gt;Nostoceras&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;(N.) sp.,&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="italic"&gt;Didymoceras platycostatum&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;(Kennedy and Cobban, 1993b),&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="italic"&gt;D. stevensoni&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;(Whitfield, 1877) (previously thought to be from the Marshalltown) and&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="italic"&gt;Exiteloceras jenneyi&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;(Whitfield, 1877). The last two are index species of their eponymous zones in the Western Interior. This sequence is compatible with ammonites from the Wenonah Formation, which lies between the Marshalltown and Mount Laurel to the north and contains ammonites indicative of the&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="italic"&gt;Baculites scotti&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;zone, and the fauna from higher in the Mount Laurel Sand, which includes elements of the&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="italic"&gt;Didymoceras cheyennense&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;and&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span class="italic"&gt;Baculites compressus&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;zones of the Western Interior sequence.&lt;/p&gt;&lt;/div&gt;&lt;/div&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.1017/S0022336000038968</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Paleontology Society</dc:publisher>
  <dc:title>Upper campanian (upper cretaceous) ammonites from the Marshalltown Formation-Mount laurel boundary beds in Delaware</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>