Abstract
Parkin and Tilles1 recently described the methods used for measuring the influx of extraterrestrial material to the Earth's surface and discussed critically the significance of the results so far obtained. In particular, they mentioned unpublished work by J. L. Barker, in which the abundances of osmium and iridium in deep sea sediments had been applied to the estimation of the infall rate. This was of interest because, in the course of an extensive study of the distribution of rhenium and osmium in rocks2, the abundances of trace elements in a Silurian shale had been applied in a similar way. Although the relevant data required for the calculation have been published previously3–6 the result has not, and to do so is the intention of this communication.
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Parkin, D. W., and Tilles, D., Science, 159, 936 (1968).
Morgan, J. W., thesis, Australian National Univ., Canberra.
Lovering, J. F., and Morgan, J. W., Geochim. Cosmochim. Acta, 28, 761 (1964).
Compston, W., and Pidgeon, R. T., J. Geophys. Res., 67, 3493 (1962).
Morgan, J. W., and Lovering, J. F., Geochim. Cosmochim. Acta, 31, 1893 (1967).
Morgan, J. W., and Lovering, J. F., Earth Plan. Sci. Lett., 3, 219 (1967).
Öpik, A. A., Bulletin 32 (Bureau of Minsral Resources, Australia, 1958).
Goldschmidt, V. M., Geochemistry (edit. by Muir, A.) (Oxford University Press, London, 1954).
Vogt, J. R., and Ehmann, W. D., Geochim. Cosmochim. Acta, 29, 373 (1965).
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MORGAN, J. Estimate of the Influx of Extraterrestrial Material during the Silurian. Nature 219, 147 (1968). https://doi.org/10.1038/219147a0
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DOI: https://doi.org/10.1038/219147a0
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