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This chapter contains sections titled:
Introduction
Geological Setting and Age
Stromatolite Biostromes of the Atar Formation
Parasequence Development of Stromatolite Biostromes
Discussion
Summary and Conclusions
Acknowledgements
The Avzyan Formation of the southern Ural Mountains, Russia, forms part of the Middle Riphean (∼1300–1000 Ma) type section. Its age is constrained to be younger than 1348 Ma and older than 1080 Ma and thus may preserve all or part of the mid-Mesoproterozoic isotopic shift. This shift represents a significant reorganization of the carbon cycle and separates pre-1300 Ma carbonates with δ 13 ...
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