c. 6100000 BC–c. 5700000 BC
*Orrorin tugenensis* femora in the Tugen Hills
Human evolution & hominins · Homininos tempranos · Fémur · Bipedismo inferido
Remains attributed to *Orrorin tugenensis* in Kenya date to around six million years ago; the morphology of a femur has been interpreted as compatible with weight-bearing on two legs. That inference does not imply a gait identical to that of living humans or rule out arboreal climbing: the remains retain a mosaic of traits and the sample is limited. This entry records anatomical evidence, not observed behaviour.
Precision, calendar, and review
- Start
- year · approximate
- End
- year · approximate
- Calendar and convention
- Historical-era years; the source calendar is not identified. No conversion of days is assumed.
- Year zero
- The scale goes from 1 BCE to 1 CE without year zero. Changing era names changes labels only.
- Documentary review
- Date not recorded
Reading the date: dating window; it does not mean the event lasted for that entire interval.
Sources
- humanorigins.si.edu (opens in a new tab)
Source provenance and scope
- Publication date
- Not identified in metadata; document review pending
- Source updated
- 2024-01-03
- Bibliographic date checked
- 2026-09-23
The correspondence between this reference and individual claims has not yet been itemized.
This record is an editorial synthesis. Consult the sources to check claims and their limits. Chronological relationships alone do not establish causation.