Abstract
A method for dating fluctuations in abundance of Elasmobranchii based on three parameters: density of fossil teeth on the ocean floor, density of modern species, and the rate of teeth replacement in modern species is proposed. As a model event, the substitution by the blue shark Prionace glauca of sharks of the genus Isurus that dominated from the Pliocene to the Late Holocene was used. It was determined that, at various values of the aforementioned parameters, the blue shark occupied a dominant position in the eastern Pacific between 302 and 3940 years ago. It is suggested that, in case of a large amount of material in geological collections using this method, a great number of paleoreconstructions of the development and changes in the oceanic biota may be carried out.
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Original Russian Text © F.F. Litvinov, 2007, published in Voprosy Ikhtiologii, 2007, Vol. 47, No. 3, pp. 292–295.
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Litvinov, F.F. Foundations of the method of dating global fluctuations of abundance of oceanic sharks on the basis of the amount of fossil teeth in bottom sediments. J. Ichthyol. 47, 267–270 (2007). https://doi.org/10.1134/S0032945207040029
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DOI: https://doi.org/10.1134/S0032945207040029