Table 4. Sr isotopic and δ¹⁸O values for enamel and dentine sample for GC96.

Sample	87Sr/86Sr	δO18 carbonate, pdb, ‰	δO18 phosphate equivalent, vsmow, ‰	δO18 drinking water equivalent, vsmow, ‰
GC96M2 enamel		-5.25	16.6	-8.1
GC96M2 dentine1	0.708368 ± 0.000070
GC96M2 dentine2	0.708902 ± 0.000064
GC96M2 dentine3	0.708685 ± 0.000072

The structural carbonate fraction was measured and converted to a phosphate equivalent and then to an equivalent drinking water value using Chenery et al. [22]. Typical uncertainty on the δ¹⁸O carbonate is ±0.15 ‰, 1 sigma.