Cretaceous Period, Aptian Stage, 125-113 million years BP. An African T-rex Carcharodontosaurus saharicus tooth with visible serration. 14 grams, 55mm (2 1/4"). From an old Lincolnshire collection 1980s; from the Tegana formation of the Sahara Desert, Morocco, North Africa. The Carcharodontosaurus saharicus was one of the largest predators of all time (larger than its distant North American T-Rex cousin) and is related to Allosaurus and the South American Giganotosaurus.