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The 28 Be ages obtained within the anthracotheriid unit containing Toumaï bracket, by absolute dating, the age of Sahelanthropus tchadensis to lie between 6.8 and 7.2 Ma.

This chronological constraint is an important cornerstone both for establishing the earliest stages of hominid evolution and for new calibrations of the molecular clock.

Cranial features show a flatter face, u-shaped dental arcade, small canines, an anterior foramen magnum, and heavy brow ridges. The only known skull suffered a large amount of distortion during the time of fossilisation and discovery, as the cranium is dorsoventrally flattened, and the right side is depressed.

However, because no postcranial remains (i.e., bones below the skull) have been discovered, it is not known definitively whether Sahelanthropus was indeed bipedal, although claims for an anteriorly placed foramen magnum suggests that this may have been the case.

Upon examination of the foramen magnum in the primary study, the lead author speculated that a bipedal gait "would not be unreasonable" based on basicranial morphology similar to more recent hominins.

In the 2015 video game Metal Gear Solid V: The Phantom Pain, set in 1984, Sahelanthropus is the model and namesake for a Metal Gear, a large, bipedal, nuclear-armed tank, which is crucial to the plan of the game's main antagonist.

Ages were determined at two hominid localities from the Chad Basin in the Djurab Desert (Northern Chad).

In the Koro Toro fossiliferous area, KT 12 locality (16°00'N, 18°53'E) was the site of discovery of Australopithecus bahrelghazali (Abel) and in the Toros-Menalla fossiliferous area, TM 266 locality (16°15'N, 17°29'E) was the site of discovery of Sahelanthropus tchadensis (Toumaï).

In fact, Toumaï may have been reburied in the recent past.

Taphonomic analysis reveals the likelihood of one, perhaps two, burial(s).

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