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. 2014 May 12;111(21):7537–7541. doi: 10.1073/pnas.1319253111

Fig. 2.

Fig. 2.

Sample positions of the 1995 sample set, plotted with lithological units, mean grain size on the Krumbein phi (φ) scale, and four different Iridium profiles, from refs. 46–49. A closely spaced sample set was obtained to acquire a high temporal resolution.