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TheDjurab Desert (Djourab,جراب) is adesert in northernChad.[1][2][3] Part of the greaterSahara desert, it makes up much of the area of Chad'sBorkou region.
TheKoro Toro settlement and maximum security prison is situated on the eastern boundary of the desert.The closest major settlements areSalal to the south andFaya-Largeau to the northeast. To the west is theTénéré desert (theErg of Bilma) of western Chad andNiger, to the north are theTibesti Mountains of the central Sahara.
Aeoliandeflation in the northern subbasin formed the desert with an arid conditions.[4] Desert reached throughSahara and reducedLake Chad.[4]
Manyfossils have been found in this desert,Kossom Bougoudi andToros-Menalla being among the most bountiful fossil-bearing areas.[5]A team led byMichel Brunet, from theUniversity of Poitiers, excavated in the Djurab desert during the mid-1990s.[6][7]
In 2001, the type fossil ofSahelanthropus tchadensis, a hominid species of about 7 million years ago, was discovered at Toros-Menalla (16°15′N17°30′E / 16.25°N 17.5°E /16.25; 17.5, some100 km north ofSalal), at 250 meters above sea level.[2][6][8]Michel Brunet, since 1994, has exploredMiocene andPliocene deposits in the desert with theMission Paléoanthropologique Franco-Tchadienne, which are located in a basin which includesLake Chad.[4]In the period of theSahelanthropus tchadensis, desert would have long dry season, and fruits would have been able to grow at certain times of the year.[9]
^de Bonis, Louis; Peginé, Stéphane; Mackaye, Hassane Taisso; Likius, Andossa; Vignaud, Patrick;Brunet, Michel (December 2008). "The fossil vertebrate locality Kossom Bougoudi, Djurab desert, Chad: A window in the distribution of the carnivoran faunas at the Mio–Pliocene boundary in Africa".Comptes Rendus Palevol.7 (8):571–581.doi:10.1016/j.crpv.2008.10.004.