First occurrence of early Homo in the Nachukui Formation (West Turkana, Kenya) at 2.3-2.4 Myr - Archive ouverte HAL Access content directly
Journal Articles Journal of Human Evolution Year : 2005

First occurrence of early Homo in the Nachukui Formation (West Turkana, Kenya) at 2.3-2.4 Myr

(1) , (2) , (3) , (3) , (3) , (4) , (5) , , , (6) , (5)
1
2
3
4
5
6

Abstract

Cognitive abilities and techno-economic behaviours of hominids in the time period between 2.6-2.3 Myr have become increasingly well-documented. This time period corresponds to the oldest evidence for stone tools at Gona (Kada Gona, West Gona, EG 10-12, OGS 6-7), Hadar (AL 666), lower Omo valley (Ftji1, 2 & 5, Omo 57, Omo 123) in Ethiopia, and West Turkana (Lokalalei sites -LA1 & LA2C-) in Kenya. In 2002 a new palaeoanthropological site (LA1α), 100 meters south of the LA1 archaeological site, produced a first right lower molar of a juvenile hominid (KNM-WT 42718). The relative small size of the crown, its marked MD elongation and BL reduction, the relative position of the cusps, the lack of a C6 and the mild expression of a protostylid, reinforced by metrical analyses, demonstrate the distinctiveness of this tooth compared with Australopithecus afarensis, A. anamensis, A. africanus and Paranthropus boisei, and its similarity to early Homo. The LA1α site lies 2.2 m above the Ekalalei Tuff which is slightly younger than Tuff F dated to 2.34 ± 0.04 Myr. This juvenile specimen represents the oldest occurrence of the genus Homo in West Turkana.

Dates and versions

hal-00112900 , version 1 (10-11-2006)

Identifiers

Cite

Sandrine Prat, Jean-Philip Brugal, Jean-Jacques Tiercelin, Jean-Alix J-A Barrat, Marcel Bohn, et al.. First occurrence of early Homo in the Nachukui Formation (West Turkana, Kenya) at 2.3-2.4 Myr. Journal of Human Evolution, 2005, 49 (2), pp.230-240. ⟨10.1016/j.jhevol.2005.03.009⟩. ⟨hal-00112900⟩
292 View
0 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More