10.6084/m9.figshare.3454307.v1
Francis H. Brown
Francis H.
Brown
Bereket Haileab
Bereket
Haileab
Ian McDougall
Ian
McDougall
Sequence of tuffs between the KBS Tuff and the Chari Tuff in the Turkana Basin, Kenya and Ethiopia
Geological Society of London
2016
Chari Tuff
Konso Formation
KBS
sequence
Omo Group formations
90 ka interval
tuff
Koobi Fora Formation
Geology
2016-06-21 12:02:20
Dataset
https://geolsoc.figshare.com/articles/dataset/Sequence_of_tuffs_between_the_KBS_Tuff_and_the_Chari_Tuff_in_the_Turkana_Basin_Kenya_and_Ethiopia/3454307
<p>This paper describes a sequence of tuffs between the KBS and the Chari Tuff of Omo Group formations in Kenya and Ethiopia.
These tuffs have recently been shown to be 1.87 ± 0.02 Ma and 1.38 ± 0.03 Ma in age, respectively. The sequence of tuffs that
is derived is consistent with <sup>40</sup>Ar/<sup>39</sup>Ar ages reported separately, and provides the stratigraphic framework for interpreting those ages. Further, new correlations
are established to the Konso Formation in southern Ethiopia. As drainage from the Ethiopian Rift to the Omo–Turkana Basin
developed after deposition of the Konso Formation, pumice clasts in tuffs of the Omo–Turkana Basin probably were transported
there by the Omo River. The tuffs are divided into five groups on the basis of their stratigraphic position in relation to
extensive ash layers. The sequence of tuffs has import for the placement and age of archaeological sites in the Koobi Fora
Formation, and for ages of mammalian faunas (including hominids). Many tuffs were deposited during a 90 ka interval during
which Mediterranean sapropels are lacking, suggesting that Nile flow was reduced, and that the level of a lake that occupied
the Omo–Turkana Basin at the time was low. Thus the record of climatic influence on deposition in the Omo–Turkana Basin, previously
shown for the Kibish Formation (≤200 ka), extends at least to early Pleistocene time.
</p>