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.
Correct Answer:
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Q20: The Neoproterozoic radiation of large, conspicuous animals
Q21: The Proterozoic orogeny that built mountains along
Q22: Africa was assembled in the Pan-African orogeny
Q23: _ is a continental craton that was
Q24: The 1.85-billion-year-old Sudbury impact crater contains
A) spherical,
Q25: The Paleoproterozoic buildup of atmospheric oxygen resulted
Q26: The great Proterozoic supercontinent, which was split
Q27: In the Rodinia of 800 million years
Q28: The Proterozoic Keweenawan basalts
A) covered much of
Q29: Cap carbonates resting directly on all three
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