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FIGURE 5. Birth and growth of Precambrian paleobiology. REFERENCESBarghoorn, E. S. & Schopf, J. W. ( 1965) Microorganisms from the Late Precambrian of central Australia. Science 150, 337–339. Barghoorn, E. S. & Tyler, S. A. ( 1965) Microorganisms from the Gunflint chert. Science 147, 563–577. Cloud, P. ( 1948) Some problems and patterns of evolution exemplified by fossil invertebrates Evol. 2, 322–350. Cloud, P. ( 1965) Significance of the Gunflint (Precambrian) microflora. Science 148, 27–45. Cloud, P. ( 1972) A working model of the primitive Earth. Am. J. Sci. 272, 537–548. Cloud, P. ( 1983) Early biogeologic history: The emergence of a paradigm. In Earth's Earliest Biosphere, An Interdisciplinary Study, ed. Schopf, J. W. (Princeton Univ. Press, Princeton, NJ), pp. 14–31. Cloud, P & Licari, G. R. ( 1968) Microbiotas of the banded iron formations. Proc. Nat. Acad. Sci. USA 61, 779–786. Cloud, P. & Morrison, K. ( 1980) New microbial fossils from 2 Gyr old rocks in northern Michigan. Geomicrobiol. J. 2,161–178. Cloud, P., Moorman, M., & Pierce, D. ( 1975) Sporulation and ultrastructure in a late Proterozoic cyanophyte: Some implications for taxonomy and plant phylogeny. Quart. Rev. Biol. 50, 131–150. Darwin, C. ( 1859) On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life, facsimile of the 1st edition of 1859 (Harvard Univ. Press, Cambridge, MA, 1964); facsimile of the 6th (and last) edition of 1872 (John Murray, London, 1902). Dawson, J. W. ( 1875) The Dawn of Life (Hodder & Stoughton, London).
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