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The samples recovered from Site 214, Core 46, CC consisted of a piece of wood, preserved as xylite, together with some material which appeared earthy in hand specimen. The earthy material consisted mainly of small fragments of xylite together with some highly degraded plant material. All of the material appears to be a vitrinite precursor. The oil reflectivity (λ = 525 nm µ oil = 1.516) is constant over the samples (within the reproducibility error of the apparatus) at 0.20%. This value is extremely low and is similar to values found for some components of peats and brown coals. On the basis of data from offshore bores this value is reasonably consistent with normal heat flow for a depth of 425 meters since there has been little progression along the rank series. No cellulose was observed (cellulose is present in the brown coals at Yallourn and Morwell). Much of the xylite shows crushed cell structure (Plate 1), but most of the material has a vitrinite precursor in the cell lumens so that it resembles the telinite of bituminous coals. Some cell lumens are open (Plate 2), but many of the structures are quite compact. The cell walls tend to stand out in strong relief from the lumens due to the differences in polishing hardness, but the reflectivity of the walls and lumens is essentially the same.

Report on the Petrography of a Paleocene Brown Coal Sample from the Ninetyeast Ridge, Indian Ocean