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Permian
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=== Paleoceanography === Sea levels dropped slightly during the earliest Permian (Asselian). The sea level was stable at several tens of metres above present during the Early Permian, but there was a sharp drop beginning during the Roadian, culminating in the lowest sea level of the entire Palaeozoic at around present sea level during the Wuchiapingian, followed by a slight rise during the Changhsingian.<ref>{{cite journal|last1=Haq|first1=B. U.|last2=Schutter|first2=S. R.|date=3 October 2008|title=A Chronology of Paleozoic Sea-Level Changes|journal=Science|volume=322|issue=5898|pages=64β68|doi=10.1126/science.1161648|pmid=18832639|bibcode=2008Sci...322...64H|s2cid=206514545}}</ref>
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