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[See B.P. Glass and Jiquan Wu, Coesite and shocked quartz discovered in the Australasian and North American microtektite layers, Geology, Vol. 21, May 1993, pp 435-438.] [See R. Ganapathy, D.E. Brownlee, and P.W. Hodge, Silicate Spherules from Deep-Sea Sediments: Confirmation of Extraterrestrial Origin, Science, Vol. 201, Sept. 22, 1978, pp 1119-1121.]