Interbedded cherts with banded iron formations, or with volcanic ash deposits, are taken to mean that the Precambrian oceans had more dissolved silica or more volcanism.

Question

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Interbedded cherts with banded iron formations or volcanic ash deposits suggest the presence of more dissolved silica or increased volcanic activity in the Precambrian oceans.

Interbedded Cherts with Banded Iron Formations, or with Volcanic Ash