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Sauropod Trackways, Evolution, and Behavior | Science
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REFERENCES AND NOTES

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W. B. Harland et al., A Geologic Time Scale (Cambridge Univ. Press, Cambridge, 1992).
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Day J. J., Norman D. B., Upchurch P., Powell H. P., Nature 415, 494 (2002).
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Wilson J. A., Carrano M. T., Paleobiology 25, 252 (1999).
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Upchurch P., Zool. J. Linn. Soc. 124, 43 (1998).
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S. Ishigaki, in Dinosaur Tracks and Traces, D. D. Gillette, M. G. Lockley, Eds. (Cambridge Univ. Press, Cambridge, 1989), pp. 83–86.
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Santos V. F., et al., Gaia 10, 5 (1994).
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Upchurch P., Philos. Trans. R. Soc. London Ser. B Biol. Sci. 349, 365 (1995).
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___, P. M. Barrett, in Evolution of Herbivory in Terrestrial Vertebrates: Perspectives from the Fossil Record, H.-D. Sues, Ed. (Cambridge Univ. Press, Cambridge, 2000), pp. 79–122.
9
J.J.D. and D.B.N. are supported by Leverhume grant F/09633A. P.U. is supported by Natural Environment Research Council fellowship GT59906ES.

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