In the Koro Toro fossiliferous area, KT 12 locality (16°00′N, 18°53′E) was the site of discovery of (Toumaï).
At both localities, the evolutive degree of the associated fossil mammal assemblages allowed a biochronological estimation of the hominid remains: early Pliocene (3–3.5 Ma) at KT 12 and late Miocene (≈7 Ma) at TM 266. This chronological constraint is an important cornerstone both for establishing the earliest stages of hominid evolution and for new calibrations of the molecular clock. Localities investigated in this area include TM 266 and TM 254 (Fig. The Kollé (KL), Kossom Bougoudi (KB), and Koro Toro (KT) fossiliferous areas were specifically studied to calibrate the authigenic Be dating method by direct comparison with biochronological estimations of co-located mammalian assemblages.
It is also of great importance as it is the first fossil to show that there is a geographical "third window", that is, beyond East Africa and South Africa, of early hominin evolution.
Ages were determined at two hominid localities from the Chad Basin in the Djurab Desert (Northern Chad).
Finally, a fourth fossil mandibular fragment with two teeth was unearthed July 18, 2000 a few kilometers south of the site KT13 on the new site of KT40.
The three sites of hominids KT12, KT13 and KT40 are located at the foot of the same sandy cord, the Goz Kerki, testimony of the former shoreline of Lake Méga Tchad.
The KT-12/H1 mandible has similar features to the dentition of Australopithecus afarensis, which has caused researcher William Kimbel to argue that Abel is not a separate species, but "falls within the range of variation" of the species Australopithecus afarensis.The younger group was females aged 29 to 36 and males aged 28 to 36.Brunet said everyone receives a dating card and a set of questions.The fossil potential of this sector therefore remains important.The locality is roughly 2,500 km (1,600 mi) west of the East African Great Rift Valley, making it far removed from what is broadly thought to be the "cradle" area of human evolution.