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Probing the evolution of photosynthetic life on the early Earth

narrative of evolutionary history: the oceans are life’s cradle, with life gaining the continents only later. Seemingly, the geologic record supports this perception, as the oldest records of bacteria, eukaryotes in general and animals in particular all occur in sedimentary rocks deposited beneath the sea. At least in part, however, the observed pattern reflects a major bias of sedimentary rocks. Marine environments are commonly places where sediments accumulate,