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Swiss Journal of Geosciences
Fig. 7 | Swiss Journal of Geosciences

Fig. 7

From: Survival of the thinnest: rediscovery of Bauer’s (1898) ichthyosaur tooth sections from Upper Jurassic lithographic limestone quarries, south Germany

Fig. 7

Detail of the orthodentine showing incremental lines of growth in polarised light in the longitudinal section (BSPG AS I 1656, Ichthyosauria indet. aff. Nannopterygius). Two sets of incremental lines are visible: the first set is composed of very fine dark and light lines (indicated by arrow heads), interpreted as daily lines of von Ebner. The second set consists of broader dark and light bands, indicating longer time periods, i.e. Andresen lines. DB dark band, DT dentine tubules, LB light band

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