Human Evolution
7.0 Million Years Ago (mya)
└── SAHELANTHROPUS TCHADENSIS
├── Timeframe: 7.0–6.0 mya
├── Key Discovery: "Toumaï" (Chad, Central Africa)
├── Brain Size: ~350 cc (Chimpanzee-sized)
└── Key Traits: Oldest known hominin; placement of the spinal cord opening (foramen magnum) suggests a transitional form of walking upright.


mya is a short form of Million Years Ago mya