Pimm, S. 1991.
Pimm, S., G. Russell, J. Gittleman, and Т Brooks. 1995. The future of biodiversity.
Pope, K., A. Baines, A. Ocampo, and B. Ivanov. 1994. Impact winter and the Cretaceous Tertiary extinctions: Results of a Chicxulub asteroid impact model.
Raff, R. A. 1996.
Rampino, M., and K. Caldeira. 1993. Major episodes of geologic change: Correlation, time structure and possible causes.
Raup, D. 1979. Size of the Permo-Triassic bottleneck and its evolutionary implications.
Raup, D. 1990. Impact as a general cause of extinction: A feasibility test. In
Raup, D. 1991. A kill curve for Phanerozoic marine species.
Raup, D., and J. Sepkoski. 1984. Periodicity of extinction in the geologic past
Raven, P. 1990. The politics of preserving biodiversity.
Retallack, G. 1995. Permian-Triassic crisis on land.
Sagan, C., and C. Chyba. 1997. The early faint sun paradox: Organic shielding of ultraviolet-labile greenhouse gases.
Salvadori, К 1990.
Sepkoski, J. 1984. A model of Phanerozoic taxonomic diversity.
Schindewolf, O. 1963. Neokatastrophismus?
Schwartzman, D., M. McMenamin, and Т Volk. 1993. Did surface temperatures constrain microbial evolution?
Sheehan, P., D. Fastovsky, G. Hoffman, C. Berghaus, and D. Gabriel. 1991. Sudden extinction of the dinosaurs: Latest Cretaceous, Upper Great Plains, U.S.A.
Sigurdsson, H., S. D’hondt, and S. Carey. 1992. The impact of the Cretaceous-Tertiary bolide on evaporite terrain and generation of major sulfuric acid aerosol.
Sleep, N. H., K. J. Zahnle, J. F. Kasting, and H. J. Morowitz. 1989. Annihilation of ecosystems by large asteroid impacts on the Earth.
Stanley, S. 1987.
Stanley, S., and X. Yang. 1994. A double mass extinction at the end of the Paleozoic era.
Stenseth, N. 1984. The tropics: Cradle or museum?
Stone, C., and D. Stone, eds. 1989.
Stuart, C., and Т Stuart. A field guide to the larger animals of Africa. Cape Town: Struik Publishers.
Teichert, C. 1990. The end-Permian extinction. In
Towe, К. М. 1994. Earth’s early atmosphere: Constraints and opportunities for early evolution. In
Valentine, J. W. 1994. Late Precambrian bilaterians: Grades and clades.
Valentine, J. W., D. H. Erwin, and D. Jablonski. 1996. Developmental evolution of metazoan body plans: The fossil evidence.
van Andel, Т. Н. 1985.
Vermeij, G. 1991. When biotas meet: Understanding biotic interchange.
Walker, J. C. G. 1977
Ward, P. 1990. The Cretaceous/Tertiary extinctions in the marine realm: A 1990 perspective: In
Ward, P. 1994.