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Figure F3. Section photographs. A. Fine to medium sandstone intercalated with thin siltstone layers (2–3 mm) with dolomitic bands. B. Sandstone with pebbles of igneous rocks, few cherts, and rare pumice. C. Grain-supported conglomerate at the bottom. A small coarsening-upward interval with a fine conglomerate at the top (43 cm). The clayey fine sandstone visible above is typical for Subunit IIa. D. Organic-rich layer in medium sandstone (87 cm, Subunit IIb). Slightly dipping beds, parallel lamination, and horizontal burrows (88 cm) filled with siltstone are also visible. E. Vertical burrows filled with medium sandstone in a silty shale (Subunit IIb). Shell fragments appear in the lower part. F. Abundant shell fragments in medium sandstone (Subunit IIb). G. Coaly shale with pyrite (upper part) in contact with coal interval (lower part) from Unit III. H. Light brown cemented (sideritic) mudstone and concretions (Unit III). In the middle of this brown horizon, a thin coaly layer appears. I. Sandstone with siderite bands (brownish color; Unit IV). J. Siltstone with siderite concretion in silty shale (Unit IV). Lenticular bedding is visible in this section.

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