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Metazoans foil the development
of stromatolites during the Phanerozoic.
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unless stromatolite formed a hard,
lithified structure while it was growing, or lived in an environment where
Metazoans could not, burrowing and grazing animals would destroy the microbial
mats forming stromatolites
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this would prevent the mat from
becoming established or destroy it soon after it had been accumulated
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