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<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>Appy Sluijs</dc:contributor>
  <dc:contributor>Debra A. Willard</dc:contributor>
  <dc:contributor>Henk Brinkhuis</dc:contributor>
  <dc:creator>Mei Nelissen</dc:creator>
  <dc:date>2025</dc:date>
  <dc:description>&lt;p&gt;&lt;span&gt;Over the past decades, many expanded sedimentary records from the US Atlantic Coastal Plain (ACP) have been studied in detail to assess causes and consequences of the Paleocene–Eocene Thermal Maximum (PETM;&amp;nbsp;&lt;/span&gt;&lt;span class="inline-formula"&gt;∼&lt;/span&gt;&lt;span&gt; 56 Ma). In ACP sections, the PETM, which is globally marked by a distinct negative carbon isotope excursion (CIE) lasting&amp;nbsp;&lt;/span&gt;&lt;span class="inline-formula"&gt;∼&lt;/span&gt;&lt;span&gt; 180 kyr following a large input of&amp;nbsp;&lt;/span&gt;&lt;span class="inline-formula"&gt;&lt;sup&gt;13&lt;/sup&gt;&lt;/span&gt;&lt;span&gt;C-depleted carbon into the ocean–atmosphere system, has been recorded near the base of the Marlboro Clay. However, truly detailed site-to-site correlations within the CIE interval remain difficult in view of the absence of suitable stratigraphic markers offering the required resolution. Here, augmenting earlier studies involving various other marine microfossil groups, we present a high-resolution regional organic-walled dinoflagellate cyst (dinocyst) zonation scheme covering the uppermost Paleocene to lowermost Eocene sediments of the Aquia and Marlboro Clay formations at six ACP localities. We propose five latest Paleocene (ACP Pv–Pz) and six earliest Eocene (all within the PETM interval; ACP E0a-E0f) regional informal dinocyst zones. In addition, we emend the genus&amp;nbsp;&lt;/span&gt;&lt;i&gt;Hystrichokolpoma&lt;/i&gt;&lt;span&gt;&amp;nbsp;and employ several new species, of which four, viz.&amp;nbsp;&lt;/span&gt;&lt;i&gt;Impagidinium witmeri&lt;/i&gt;&lt;span&gt;&amp;nbsp;sp. nov.,&amp;nbsp;&lt;/span&gt;&lt;i&gt;Nematosphaeropsis elongatus&lt;/i&gt;&lt;span&gt;&amp;nbsp;sp. nov.,&amp;nbsp;&lt;/span&gt;&lt;i&gt;Hystrichokolpoma heroldiae&lt;/i&gt;&lt;span&gt;&amp;nbsp;sp. nov., and&amp;nbsp;&lt;/span&gt;&lt;i&gt;Cannosphaeropsis frielingii&lt;/i&gt;&lt;span&gt;&amp;nbsp;sp. nov., are formally described. Furthermore, we calibrate the dinocyst zones against magneto-, bio-, and ecostratigraphic records to allow robust regional correlation and age assessments with an average time resolution of&amp;nbsp;&lt;/span&gt;&lt;span class="inline-formula"&gt;&amp;lt;&lt;/span&gt;&lt;span&gt; 10&lt;/span&gt;&lt;span class="inline-formula"&gt;&lt;sup&gt;5&lt;/sup&gt;&lt;/span&gt;&lt;span&gt;&amp;nbsp;years for the late Paleocene and&amp;nbsp;&lt;/span&gt;&lt;span class="inline-formula"&gt;&amp;lt;&lt;/span&gt;&lt;span&gt; 10&lt;/span&gt;&lt;span class="inline-formula"&gt;&lt;sup&gt;4&lt;/sup&gt;&lt;/span&gt;&lt;span&gt;&amp;nbsp;years within the PETM interval. The scheme provides new opportunities for portraying the environmental and sedimentological evolution across the US Atlantic Coastal Plain during the PETM in unprecedented detail.&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.5194/jm-44-431-2025</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>Micropalaeontological Society</dc:publisher>
  <dc:title>A high-resolution late Paleocene–early Eocene organic-walled dinoflagellate cyst zonation of the United States Atlantic Coastal Plain</dc:title>
  <dc:type>article</dc:type>
</oai_dc:dc>