The Gweni Fada structure was first noted on the map NE 34 X Fada of the IGN (National Geographic Institute France) and aerial photographs in the 1950s of IGN by Alain Beauvilain (Paris X- Nanterre University). In April 1995, at the initiative of CNAR (National Center to Help Research of Chad) a team of French geologists (Pierre Vincent, University of Clermont-Ferrand, Alain and Najia Beauvilain, CNAR Chad) visited the site and reported evidence of shock metamorphism within rock samples they had collected inside the structure.
It is 14 km in diameter and the age is estimated to be less than 345 million years (Carboniferous). It is older than that of Aorounga because its coverage of impactite has disappeared as a result of erosion.
- "Gweni-Fada". Earth Impact Database. University of New Brunswick. Retrieved 2009-08-13.
- VINCENT P.M., BEAUVILAIN A., 1996. Découverte d'un nouveau cratère d'impact météoritique en Afrique : l'astroblème de Gweni-Fada (Ennedi, Sahara du Tchad). C.R. Acad. Sci. Paris, t. 323, série II a, pp. 987-997.
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