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We thank S. Bowing, J. Edmond, B. Farrell, M. Delaney, J. Grotzinger, A. Knoll, J. Marshall, M. McElroy, and P. Myrow for discussions. B. Holtzman, G. Hu, A. Maloof, A. Prave, G. Soffer, and D. Sumner contributed to fieldwork. The manuscript benefited from comments by K. Caldeira, L. Derry, D. Erwin, L. Kump, and an anonymous reviewer. This work was supported by NSF grants EAR 95-06769, EAR 95-10339, EAR 96-30928, EAR 96-14070, and OCE 97-33688; the National Sciences and Engineering Research Council of Canada; the Canadian Institute of Advanced Research; Harvard University; the University of Maryland; and the Geological Survey of Namibia.
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