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Currently, 18 impact structures have been identified on the continent of Africa. No impact structures are so far known in Ethiopia, with the exception of a suggestion of an impact crater centered on the town of Shakiso, southern Ethiopia. Our field work, petrographic, and geochemical studies on rocks from the area do not show any evidence of an impact structure at that locality. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   
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