Phytoliths indicate significant arboreal cover at Sahelanthropus type locality TM266 in northern Chad and a decrease in later sites Patrick Vignaud, Hassane Taisso Mackaye, Andossa Likius, Didier L. Bourlès, Christine Paillès, Florence Sylvestre, Doris Barboni, Alice Novello, Michel Brunet, A.E. Lebatard • 2017