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Isotopic analysis of coexisting Late Jurassic fish otoliths and molluscs: Implications for upper-ocean water temperature estimates

¹ School of Earth, Ocean, and Environmental Sciences, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK

View larger version (24K): [in this window] [in a new window]   Figure 1. Sketch map showing the occurrence of Oxfordian-Kimmeridgian rocks in the UK and the location of Wootton Bassett.

View larger version (74K): [in this window] [in a new window]   Figure 2. Scanning electron microscope photomicrographs. A: Otolith microstructures revealing structures similar to other well-preserved otoliths (e.g., Dufour et al., 2000). B: Nacreous layers in ammonite sample (an aulacostephanid) showing typical hexagonal tablets and vertical arrangement. C: Microstructure of calcitic foraminifera Lenticulina muensteri showing partial recrystallization of wall texture and test infilling. D: Microstructure of aragonitic foraminifera Epistomina tenuicostata showing wall texture and pyrite octahedra.

View larger version (14K): [in this window] [in a new window]   Figure 3. Crossplot of 18O and 13C data from Jurassic fauna from Wootton Bassett.