FIGURE 1 in Virtual palaeontology: the effects of mineral composition and texture of fossil shell and hosting rock on the quality of X-ray microtomography (XMT) outcomes using Palaeozoic brachiopods

FIGURE 1. Thin section and cathodoluminescence (CL) photomicrographs: Timaniella harkeri (GSC26406) (1-4), Spiriferina sp. (BS-1) (5-8), Stenoscisma timorense (BS-2) (9-12), Cleiothyridina baracoodensis (ML32) (13-16) and Tylothyris transversa (TeP) (17-20). 1-2, transmitted light (TL) (1) and corresponding CL images (2) of nonluminescent shell and infilling sediment composed of fine sand grains. 3-4, TL (3) and CL (4) images of nonluminescent associated with partially luminescent shell in the cardinal area of dorsal valve. 5-8, TL (5, 7) and CL (6, 8) images of nonluminescent associated with partially luminescent shell and luminescent infilling cement. 9-12, TL (9, 11) and CL (10, 12) images of luminescent shell with thin silicified layers and recrystallization along inner wall of brachiopod shell. 13, plane-polarized light (PPL) image of the original infilling sediment composed of calcareous sands. 14, PPL image showing the section of infilling cement. 15-16, TL (15) and CL (16) images of slightly luminescent shell. 17, PPL image of infilling comprising lime mud, calcite cement and relatively large, radially arranged, siliceous crystals. 18-19, TL (18) and CL (19) images of nonluminescent associated with partially luminescent shell. 20, CL image showing the section of nonluminescent internal shell structure (spiralia) preserved within infilling (This structure is hardly recognized in the TL image). Abbreviations: bs, brachiopod shell; im, infilling material; sl, silicified layer; cc, calcite crystal; NL, nonluminescent; SL, slightly luminescent; L, luminescent.