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Swiss Journal of Palaeontology
Fig. 4 | Swiss Journal of Palaeontology

Fig. 4

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

Fig. 4

Effects of diagenesis on some coral specimens: A Thin-section in the calice of the specimen RAh (44) shows a completely compressed calice filled with fossiliferous mud. B Thin-section below the calice of the Bothrophyllum okense (RAh 37) shows beginning of compression and breakage of septa. C Thin-section below the calice of the specimen RAh (79), shows completely broken and altered septa, probable outer dissepimentarium and axial structure, filled with ferruginous mud. D Thin-section of a completely compressed specimen RAh (200) shows high alteration, breakage and ferrugination of skeletal elements. E Thin-section in the early mature part of the Actinophrentis crassithecata n. sp. (RAh 11), shows ferrugination affects a large part of the interior skeleton. F Mature thin-section of Rotiphyllum exile (RAh 29), shows ferrugination and dolomitization of skeletal elements. G, H Thin-sections of mature part of the specimen (RAh 81) in G and the immature part of the specimen RAh (99) in H show extensive dolomitization and ferrugination of the internal skeletal elements

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