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Reflected-light micrographs of charcoals illustrating the different fuel types observed (A) angiosperm wood, (B) bryophyte, (C) peat clast, (D) peat clast showing high reflecting oxidation rims, (E) gymnosperm wood, and (F) cones. Note the range in qualitative reflectance from low (gray) to high (white). Scale bar in (B) is the same for all images.
