We thank the following members of the Max-Planck-Institut für
Eisenforschung, Düsseldorf, Germany for their support: Dr. H. Fabritius,
K. Angenendt and M. Nellessen for the SEM–BSE-measurements,
H. Bögershausen for the nanoindentation, and H. Faul for
the Vicker’s hardness tests. We thank Dr. A. Gillis, Department of
Physiology, Development and Neuroscience, University of Cambridge,
for help with the taxonomic determination of the shark
species. We thank C. Fischer, Essen, for help with the tooth
preparation.
References