Fig. 8 in Stromatoporoids from a Middle Devonian reef in South China and their palaeoecological implication

Fig. 8. Stromatoporoids from the Jiwozhai reef, Jiwozhai Member, Dushan Formation, Givetian, Middle Devonian; Dushan, Guizhou, South China. A. Pseudotrupetostroma porosum (Yang and Dong, 1979), NIGP 177053; A1, longitudinal section; A2, tangential section; A3, enlargement of longitudinal section showing coarsely cellular microstructure coated tangential elements (arrows). B. Salairella buecheliensis (Bargatzky, 1881), NIGP 177054; B1, longitudinal section, note the predominance of the pachysteles in the right standard area and amalgamated structure in the left oblique orientation of the thin section; B2, tangential section, note the autotubes in the upper middle area; B3, enlargement of B1 showing coarsely cellular microstructure (arrows) partially transformed into melanospheric microstructure; such features demonstrate the likely diagenetic character of these microstructures and therefore their unreliability as taxonomic discriminators.