fusain
fyoo-ZAYN
Fossil charcoal — a black carbon residue of incomplete combustion preserved in sedimentary rock. Fire's oldest signature in the geologic record, appearing in the early Devonian when the first forests burned. Fusain is the proof that fire is as old as terrestrial life — wherever plants grew, they eventually burned.
Etymology
French fusain, charcoal, charcoal drawing. From Latin fusus, spindle — originally referring to spindle-tree wood used for charcoal.
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