Abstract
THE Precambrian/Cambrian boundary is one of the most important points of the geological rimescale, yet it remains stratigraphi-cally undefined1. Most of the candidate sections are in carbonate rocks2, so their carbon isotope stratigraphy can be used to infer the timing of changes in ocean chemistry3. These δ 13C profiles have been used to correlate Precambrian/Cambrian boundary sections where palaeontological information is scarce4–7. In the Anti-Atlas mountains of Morocco, two distinct positive δ 13C excursions, about 1,200 m apart in the sequence, have been detected8. On the basis of minimal palaentological information the lower of these two excursions was correlated with the base of the Vendian (latest Precambrian), and the upper with the Tom-motian/Atdabanian boundary8. We present here new palaeontological data, from calcified cyanobacteria9 and trace fossils, indicating that the consensus view on the position of the Precambrian/Cambrian boundary in this sequence is about 1,000 m too high (Fig. 1).
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Cowie, J. W. & Brasier, M. D. Oxford Monogr. Geol. Geophys. 12 (Clarendon, Oxford, 1989).
Cowie, J. W. Episodes 8, 93–97 (1985).
Veizer, J., Holser, W. T. & Wilgus, C. K. Geochim. cosmochim. Acta 44, 579–587 (1980).
Knoll, A. H., Hayes, J. M., Kaufman, A. J., Swett, K. & Lambert, I. B. Nature 321, 832–838 (1986).
Magaritz, M., Holser, W. T. & Kirschvink, J. L. Nature 320, 258–259 (1986).
Aharon, P., Schidlowski, M. & Singh, I. B. Nature 327, 699–702 (1987).
Lambert, I. B., Walter, M. R., Wenlong, Z., Songnian, L. & Guogan, M. Nature 325, 140–142 (1987).
Tucker, M. E. Nature 319, 48–50 (1986).
Latham, A. J. & Riding, R. Proc. Int. Ass. Sedim. Eur. Meet. Leuven 127–128 (Int. Ass. Sedim., 1988).
Choubert, G. Cong. Geol. Int. 19e, Alger, Monogr. region 6, 77–194 (1952).
Schmitt, M. O. & Monninger, W. E. W. in Fossil Algae (ed. Flügel, E.) 80–85 (Springer, Berlin, 1977).
Monninger, W. E. W. Arb. Paläont. Inst. Würzburg 1, 1–289.
Debrenne, F. Notes & M. Serv. géol. Maroc 179, 1–265 (1964).
Debrenne, F. & Debrenne, M. Geol. Mag. 115, 101–119 (1978).
Sdzuy, K. Geol. Mag. 115, 83–94 (1978).
Hupé, P. Centre natn. Rech. sci. Paris 76, 163 (1958).
Schmitt, M. O. Arb. Paläont. Inst. Würzburg 2, 1–188 (1979).
Choubert, G., Faure-Muret, A. & Timofeiev, B. K. C. r. hebd. Séanc. Acad. Sci. Paris 288D, 191–194 (1979).
Rozanov, A. Yu. Tr. Akad. Nauk SSSR 206, 102–104 (1969).
Bertrand-Sarfati, J. Newslett. Stratigr. 10, 20–26 (1981).
Houzay, J-P. Géol. Méditerr. 6, 379–384 (1979).
Leblanc, M. in Earth's Pre-Pleistocene Glacial Record (eds Hambrey, M. J. & Harland, W. B.) 120–122 (Cambridge University Press, 1981).
Mifdal, A. & Peucat, J-J. Sci. Géol. Bull. 38, 185–200 (1985).
Riding, R. & Voronova, L. in Paleoalgology (eds Toomey, D. F. & Nitecki, M. H.) 56–78 (Springer, Berlin, 1985).
Riding, R. & Voronova, L. Geol. Mag. 121, 205–210 (1984).
Crimes, T. P. Geol. Mag. 124, 97–119 (1987).
Fairchild, I. J., 28th Int. Geol. Congr., Washington 1989. Abstr. 1: 470 (1989).
Schidlowski, M., Eichmann, R. & Junge, C. E. Geochim. cosmochim. Acta 40, 449–456 (1976).
Fairchild, I. J. & Hambrey, M. J. Precambrian Res. 26, 111–168 (1984).
Hsu, K. J. et al. Nature 316, 809–811 (1985).
Tucker, M. E. Terra Nova 1, 573–582 (1990).
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Latham, A., Riding, R. Fossil evidence for the location of the Precambrian/Cambrian boundary in Morocco. Nature 344, 752–754 (1990). https://doi.org/10.1038/344752a0
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DOI: https://doi.org/10.1038/344752a0
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