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D. J. Briggs, D. D. Gilbertson, A. L. Harris, Molluscan Taphonomy in a Braided River Environment and Its Implications for Studies of Quaternary Cold-Stage River Deposits, Journal of Biogeography, Vol. 17, No. 6 (Nov., 1990), pp. 623-637
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Briggs et al. (1990) studied this question.
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