Acknowledgments

I thank J. Madin for helpful comments on an early draft. I thank the National Science Foundation for recognizing the importance of the Paleo-biology Database and an anonymous donor for funding the database. This work was hosted by the National Center for Ecological Analysis and

Synthesis, a center funded by the National Science Foundation and funded by National Science Foundation Grant DEB-0072909, the University of California, and the Santa Barbara campus. This is Paleobiology Database publication no. 74.

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