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Related articles:
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Key terms: cambrian ma date period land boundary fossils ice stages precise rowspan base mass extinction rocks epochs relatively stratigraphy subdivisions stratigraphic cambrian period seas global ordovician trilobite excursion namibia explosion continents geology marked ediacaran trace fossils oman cambrian is divided horizon supercontinent lower boundary of the cambrian Search external links cited by footnotes on Wikipedia page Cambrian: |
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