<?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>L.A. Soderblom</dc:contributor>
  <dc:creator>C.D. Condit</dc:creator>
  <dc:date>1978</dc:date>
  <dc:description>&lt;p&gt;&lt;span class="TextRun SCXW219995260 BCX8" lang="EN-US" xml:lang="EN-US" data-contrast="auto"&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt;The south polar region of Mars is among the most geologically diverse on the planet. The areas &lt;/span&gt;&lt;span class="ContextualSpellingAndGrammarError SCXW219995260 BCX8"&gt;is&lt;/span&gt; &lt;span class="NormalTextRun SCXW219995260 BCX8"&gt;within the heavily cratered hemisphere of Mars bu&lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt;t&lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt; is &lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt;distinguished&lt;/span&gt; &lt;span class="NormalTextRun SCXW219995260 BCX8"&gt;by a variety of younger, regionally extensive deposits and a&lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt;n&lt;/span&gt; &lt;span class="NormalTextRun SCXW219995260 BCX8"&gt;a&lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt;ssemblage of unique erosional forms. The spectrum of units varies from the oldest to the &lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt;youngest&lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt; on the planet. The oldest unit, typif&lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt;ying t&lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt;h&lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt;e cratered hemisphere, is the material of ancient large craters, most of which have undergone advanced degradation. These ancient crater materials are overlain by a variety of regional deposits, including extensive intercrater debris blankets, r&lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt;i&lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt;dged volcanic flows, and massive eolian deposits that eroded to form complex cliff-rimmed pits. In the central zone of the polar region, south of roughly 75&lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt;˚&lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt; S., these depositional units are, in turn, unconformably overlain by a &lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt;t&lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt;remendous &lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt;sedimentary&lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt; complex 1,500-2,000 km in diameter, consisting of 40 or more regularly &lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt;spaced horizontal &lt;/span&gt;&lt;span class="SpellingError SCXW219995260 BCX8"&gt;starta&lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt;. Each stratum retains apparently uniform thickness (several tons of meters) over hundreds of kilometers; erosional&lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt; unconformities between &lt;/span&gt;&lt;span class="SpellingError SCXW219995260 BCX8"&gt;starta&lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt; have not &lt;/span&gt;&lt;span class="AdvancedProofingIssue SCXW219995260 BCX8"&gt;as yet&lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt; been identified. Resting on the uppermost surface of this layered terrain&lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt; is the perm&lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt;anent residual polar ice cap. This complex stratigraphic record may ultimately hold the keys &lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt;t&lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt;o the initial atmospheric evolution, climatological fluctuations, and the history, budget, and &lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt;mobility&lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt; of wate&lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt;r&lt;/span&gt;&lt;span class="NormalTextRun SCXW219995260 BCX8"&gt; on the planet.&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;</dc:description>
  <dc:format>application/pdf</dc:format>
  <dc:identifier>10.3133/i1076</dc:identifier>
  <dc:language>en</dc:language>
  <dc:publisher>U.S. Geological Survey</dc:publisher>
  <dc:title>Geologic map of the Mare Australe area of Mars</dc:title>
  <dc:type>reports</dc:type>
</oai_dc:dc>