Abstract
Recent decades have witnessed a revolution in our understanding of the geological events and nature of life in Precambrian time. A period of Earth history once described simply as “the Azoic” (e.g., Dana, 1866) is now recognized as an interval of great complexity in terms of biological systems and their influence on the evolution of the hydrosphere and atmosphere. Characterization of Precambrian tectonic processes and climatic regimes, and their consequent sedimentological responses (e.g., transgressive-regressive sequences, glaciation, euxinic oceans), has demonstrated that, as in the Phanerozoic, biological radiations and extinctions probably reflect selective pressures exerted by such events. The evolution of new metabolic pathways and the advent of biogenic sedimentation transformed the character of sedimentary rocks. Accumulation of atmospheric oxygen, often attributed to increased levels of photoautotrophy, led to the deposition of iron formations and redbeds as well as enabling the evolution of later life forms (i.e., eukaryotic algae, metazoans, and metaphytes), with their profound sedimentological influences.
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Imbus, S.W., Mckirdy, D.M. (1993). Organic Geochemistry of Precambrian Sedimentary Rocks. In: Engel, M.H., Macko, S.A. (eds) Organic Geochemistry. Topics in Geobiology, vol 11. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-2890-6_32
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