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Correlative Microscopy of Diverse Filamentous Microfossils from 850 Ma Rocks

The study of ancient fossilised life, in particular organic-walled microfossils preserved 3-dimensionally in minerals such as quartz (cherts) has seen a revolution in the past decade. Techniques such as FIBmilling combined with SEM, TEM, Raman, and NanoSIMS, have permitted targeted analysis of fossils in situ within the rocks in which they were preserved. The resulting high resolution images and chemical maps aid in the identification of intracellular features, wall ultrastructure, and non-biological artefacts which were not previously identifiable by lower resolution methods [1-2].