FIGURE 2 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 2. Thin section and cathodoluminescence (CL) photomicrographs: Indospirifer sp. (3229) (1-4), Cyrtospirifer whitneyi (CD) (5-8), Spiriferidae gen. sp. indet. (S1) (9-12), Spiriferella loveni (F8) (13-16), Meekella sangzhiensis (Q- 1) (17-18) and Tyloplecta nanjingensis (Q-2) (19-20). 1, plane-polarized light (PPL) image of infilling micrite and shell fragments scattered. 2-3, transmitted light (TL) (2) and corresponding CL (3) images of luminescent shell. 4, CL image showing slightly luminescent shell. 5-8, TL (5, 7) and CL (6, 8) images of both luminescent shell and infilling sediment. 9-10, PPL images of brachiopod shell, infilling packstone and thin silicified layer along their boundary. 11- 12, TL (11) and CL (12) images of nonluminescent shell. 13-16, TL (13, 15) and CL (14, 16) images showing a variety of shell luminescence and infilling sediment composed of calcitic skeletal grains (bryozoan in 15 and 16). 17-20, PPL (17, 19, 20) and TL (18) images of both silicified shells and infillings. Abbreviations: bs, brachiopod shell; im, infilling material; fs, fragmented shell; os, other shell material; sl, silicified layer; NL, nonluminescent; SL, slightly luminescent; L, luminescent.