The north-eastern Morocco, is a peculiar area which is suspected to be a large impact site. It has a conspicuous ring structure with an apparent diameter of about 200 km of which half is in the sea. Jurassic mountains Taourirt-Oujda-Tlemcen showing an arc form correspond to the outer ring. Mesozoic and Palaeozoic bedrock units are locally brecciated and cut by pseudotachylite breccia dykes. Kebdana mounts with its intense and unusual deformation, form probably the central uplift of a complex crater. A wide variety of breccias is located inside and outside of the crater, many of which contain fragments exhibiting shock metamorphic features. The age of the impact is estimated to be toward the late of Messinian.
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