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Ediacaran |
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| Creatures with multiple frondlike structures lived at least 20 million years earlier, during the Ediacaran period, the interval that immediately preceded the Cambrian. The scale's newcomer--dubbed the Ediacaran (eedee-AH-kah-ren) Period--represents the time when scientists believe the first soft-bodied animals appeared on Earth. It may have even spurred a tremendous bloom of evolutionary innovation known as the Ediacaran fauna (SN: 5/18/96, p. |
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