Cambrian Explosion &
Protostome Diversity Darwins Dilemma Timeline of Earth History The Cryogenian Periods of global glaciation 635850 MYA Sponges appear in the fossil record 760MYA Ediacaran 635542 MYA
ediacaran bodycambriancurrentbodyediacaranlevelfaunasfossilmyaevidencevendianoxygenfaunarecordanimalsglaciationburrows
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