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Wilde, P., W. B. N. Berry, M. S. Quinby-Hunt, C. J. Orth, L. R. Quintana, and J. S. Gilmore (1986). Iridium abundances across the Ordovician-Silurian stratotype, Science233, 339-341.
Wilde, P., M. S. Quinby-Hunt, and W. B. N. Berry (1990). Vertical advection from oxic or anoxic water from the main pycnocline as a cause of rapid extinction or rapid radiation, in Extinction Events in Earth History, E. G. Kauffman and O. H. Walliser, eds., Springer-Verlag, Berlin, pp. 85-98.
