... of the Nachukui Formation at West Turkana and the Moiti and Lokochot Members of Koobi Fora at East Turkana. It also correlates well with the Mursi Formation and the Basal Member and Member A of the Omo Shungura Formation and the lower portion of the Hadar and Sangantole Formations in the Middle Awash region...

... horizon in the overlying Apak Member of the Nachukui Formation, yields an age of 4.22 ± 0.03 Ma; 40 Ar- 39 Ar age spectra on the succeeding Lothagam Basalt indicate an age of 4.20 ± 0.03 Ma for its eruption. Much of the rich faunal assemblage from the Nawata Formation derives from the tightly dated lower...

... & Feibel (1986) , noting a significant hiatus, and that for the Nachukui Formation is derived from Harris et al. (1988 a , b ) with minor modification. The sequence at Lothagam is from information summarized by Feibel (2003 a ) , and that at Kanapoi is after Leakey et al . (1998) and Feibel (2003 b ) . ...

...Fig. 1.  Map of the lower Omo Valley of Ethiopia and the northern part of Lake Turkana in Kenya showing the Koobi Fora, Nachukui, and Shungura Formations as light stipple. Numbered points east of the lake refer to palaeontological collection areas. Section names are given for the Shungura...

... of sandstones, mudstones, and tephras in facies interpreted as fluvial. Most of the fossils come from this formation. The Late Miocene–Early Pliocene Nachukui Formation consists of sandstones, mudstones, claystones, diatomites, and coquinas. This formation has an older fluvial phase and a younger lacustrine...

... Turkana, Kenya, showing the Koobi Fora, Nachukui and Shungura Formations as shaded areas. Numbered points east of Lake Turkana indicate palaeontological collection areas. Localities and section names are given for the Nachukui and Shungura Formations. In this contribution we present 40 Ar/ 39 Ar...

...Figure 2. Stratigraphic columns at localities where Gombe Group basalts have been identified, showing that they are confined to the lowest part of the Pliocene sections (see also Watkins, 1986 ). The Lonyumun Member of the Koobi Fora and Nachukui formations lies below the Moiti Tuff...

.... This paper is a first step towards this goal. The specimens are housed in the National Museums of Kenya, Nairobi and bear their catalog numbers (prefixed KNM). Nachukui Formation, Omo Group. Late Pliocene (ca. 3.58–3.2 Ma) of South Turkwel, Turkana Basin, northern Kenya. Figure 1...

... a significant hiatus, and that for the Nachukui Formation is derived from Harris et al. (1988) with minor modification. The sequence at Kanapoi, to the east of Loperot, is after Leakey et al. (1998) and Feibel (2003) , and the sequence at Kibish to the north of Lake Turkana is after Brown & Fuller...

...FIGURE 2 —Map of Lake Turkana area showing NAR1 locality in the Nariokotome Member of the Nachukui Formation ...