FIGURE 4. Bivariate plot of delta18O and delta13C values for enamel samples of early and middle Eocene mammals from India and Pakistan.

From the following article:

Whales originated from aquatic artiodactyls in the Eocene epoch of India

J. G. M. Thewissen, Lisa Noelle Cooper, Mark T. Clementz, Sunil Bajpai & B. N. Tiwari

Nature 450, 1190-1194(20 December 2007)

doi:10.1038/nature06343

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Results are shown as means plusminus s.d. for the sample population. Filled triangle, Indohyus; open triangle, Khirtharia; open squares, terrestrial mammals; filled squares, brackish-water anthracobunids; filled circles, freshwater/brackish-water archaeocetes. See Supplementary Information for details.

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