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Fig. 12 | Journal of Palaeogeography

Fig. 12

From: Labechia carbonaria Smith 1932 in the Early Carboniferous of England; affinity, palaeogeographic position and implications for the geological history of stromatoporoid-type sponges

Fig. 12

Thin section views of a representative chaetetid from the Early Carboniferous System showing the structure of vertically-arranged calicles in vertical section, that are polygonal in transverse section. b & c Plane-polarised (b) and cross-polarised (c) light enlargements of a vertical section showing thick calicle walls with oblique fibrous structure, and horizontal tabulae. d & e transverse section showing polygonal calicles, which do not occur in Labechia. c & e show the chaetetid wall structure is barely affected by recrystallisation, in contrast to the stromatoporoid illustrated in Fig. 9. Sample from the Eglwyseg Escarpment, North Wales, donated by Ian Somerville

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