Briefly explain the environmental significance of each of the following rock assemblages that first appeared or became abundant during Proterozoic time: sandstone-shale-carbonate; glacial tillites; banded iron formations and continental red beds.
Sandstone-shale-carbonate : Indicates major deposition along throughout the Proterozoic along rifted continental margins. Makes a case of large scale rifting processes.
Glacial Tillites: Makes a case for polar environment for large parts of earth.
Banded Iron Formation: Makes a case for increase in oxygen content in the atmosphere.
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