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Swiss Journal of Palaeontology
Fig. 15 | Swiss Journal of Palaeontology

Fig. 15

From: Kasimovian (late Pennsylvanian) cornute rugose corals from Egypt: taxonomy, facies and palaeogeography of a cool-water fauna from northern Gondwana

Fig. 15

Depositional environments of the Aheimer Formation (lower member). A Microphotograph of calcareous silty mudstone; disarticulated crinoid ossicles (Cr), tiny shell fragments (in part ostracods) and indeterminable microbioclasts associated with silt-sized quartz grains, all set in a ferruginous calcareous cement. B Microphotograph of silty dolostone; large brachiopod shell (B), crinoid ossicles (Cr) and other undifferentiated fossil fragments, all altered and dolomitized, associated with silt-sized quartz grains. Brownish-black ferruginous oxides are filling the pore spaces. C, D Microphotographs of calcareous siltstone bearing crinoids (Cr), bryozoa (Br) and other altered fossil fragments. All components set in ferruginous–calcareous cement. E, F Vertical, elongated burrows of the Tisoa siphonalis in mudstone in the uppermost part of the lower member of the Aheimer Formation

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