FIG. 12 in The Sarmatian (middle Miocene) "petrified forest" of Gramada (NW Bulgaria): role of the calcareous crusts

FIG. 12. — GR4 internal part microfacies; A, overview showing the porosity determined by the voids, partially filled by peloidal accumulations between the micritic columns; B, detail of peloids showing features of faecal pellets; C, cellular structures (type 5); D, E, spaces between columns filled by peloidal accumulations; F, G, micritic clusters containing intertwined filaments (type 4); H, composite crust with elongated filamentous and cellular structures. Scale bars: A, 5 mm; B-D, 500 µm; E, H, 200 µm; F, G, 100 µm.