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The sialic plutonism that transformed prevailing petrographic, sedimentary, and paleogeographic styles from Archean to Proterozoic aspects lasted for 600 million years. It created the first extensive cratonal surfaces, with all their potential for interaction among a diversity of microbiotas and their physical surroundings. Earth, in fact, was essentially completed during the Proterozoic. Continental and oceanic crusts and waters achieved their approximate present dimensions and chemistries. O2-releasing photosynthesis became established. Life at the cellular level differentiated, culminating in eucaryotic heredity and leading to Metazoa at the Proterozoic-Phanerozoic transition. A kinetic lag between sources and sinks of O2 eventually...

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