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12 . southern ape I el Arabic river of gazelles , Chad ) Note Au . is out of order here , in terms of date , because of its affinity to Au . Figure el site , Chad . el Chad 1995 map by En rouge is licensed under . SITES , Chad PEOPLE Michel Brunet 94 INTRODUCTION While it is possible that Au . was a distinct species , the majority view is that it was a geographic variant of Au . If that is the case , one can see how far the species ranged , from the horn of Africa , south to , and west to Chad ( see Figure ) The Chad population was close in time to the material from the Afar Depression in Ethiopia , Lucy at and at , versus the older material from , that is dated to as old as . Remember also that some researchers believe that the Ethiopian and Tanzanian populations were too far removed in geographic space and time to be ered the same species to be using the holotype from for the other populations . The partial mandible that was discovered by Michel Brunet at el differed from Au . only in having been less prognathic . A premolar was also found at the site . The ancient environment has been compared with that of ( Lucy site ) ie . a mosaic environment consisting of and grasslands . 12 . 95