1. Cf. Glossary: “natural selection”, “genetic drift”, “symbiosis”; cf. also Desmond, A. and Moore, J. (1991) Darwin. Michael Joseph, London, pp. 412–413.
2. Cf. Glossary: “red bed”; cf. also Han, T.-M. and Runnegar, B. (1992) Megascopic eukaryotic algae from the 2.1-billion-year-old Negaunee iron-formation, Michigan, Science
257, 232–235.
3. Schopf, J. W. (1993) Microfossils of the Early Archean Apex Chert: New Evidence of the Antiquity of Life, Science
260, 640–646.
4. Cf. Glossary: “Proterozoic”; cf. also Runnegar, B. (1992) Origin and Diversification of the Metazoa, in Schopf, J. W. and Klein, C. (1992) The Proterozoic Biosphere, Cambridge University Press, New York, p. 485.
5. Knoll, A. H. (1994) Proterozoic and Early Cambrian protists: Evidence for accelerating evolutionary tempo, Proc. Natl. Acad. Sci. USA
91, 6743–6750.