1991 124 p., numerous figures, paperbound. Symposium papers published in: Paleobiology.With contributions by Rosenzweig & McCord, Incumbent replacement / Shubin & Sues, Biogeography of early Mesozoic continental tetrapods / Barry et al., Faunal interchange and Miocene terrestrial vertebrates of S. Asia / Flynn et al., Enrichment and stability in Pliocene mammalian fauna of N. China / Webb, Ecogeography and the great American interchange / Vermeij, Anatomy of an Invasion: the trans-Arctic interchange / Lindberg, Marine biotic interchange between northern and southern hemispheres.