The Paleoproterozoic Shift at About 1

question 9

Multiple Choice

The Paleoproterozoic shift at about 1.85 billion years ago from banded-iron formations to red beds signals the

• A) demise of the cyanobacteria and the rise of the eukaryotic algae.
• B) effects of the gigantic asteroid impact at Sudbury and its global ejecta.
• C) buildup of significant oxygen in the atmosphere and oceans.
• D) transition from flysch to molasse deposition in many large basins.

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