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[On arguments for a volcanic origin of iridium, see the following: 1) Charles Officer, Victims of Volcanoes, New Scientist, Feb. 20, 1993, pp 34-38. 2) Charles Officer and Charles Drake, Terminal Cretaceous Environmental Events, Science, Volume 227, No. 4691, March 8, 1985 3) Michael Oard, The Extinction of the Dinosaurs, Creation Ex Nihilo Technical Journal, Vol. 11, No. 2, 1997, pp 137-154.]