“…sr isotope stratigraphy Sr isotope analyses, for dating of the carbonate deposits, were performed at four laboratories: Activation Laboratories Ltd., Ancaster, Canada; Mitsubishi Materials Natural Resources Development Corp., Saitama, Japan; University of Colorado at Boulder, USA; and Kochi Institute for Core Sample Research, Kochi, Japan. The analytical methods used at the first three laboratories were described by Takayanagi et al (2007), Nakazawa et al (2008), and Kaufman et al (1993, respectively. Those used at the Kochi Institute for Core Sample Research are given in the Appendix.…”