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. Fig, 1. (a) Schematic map showing the distribution of Cretaceous?Paleogene to 875

N. Kerio and T. Basins, have been identified using gravity and seismic 880 reflection methods In the Lokichar Basin, in addition to the Loperot-1 well (drilled in 881 1992), and the Ngamia-1 well (drilled in 2010) (indicated by a black dot and a black 882 star, respectively), several other highly promising exploration wells have been drilled 883 recently in the South Lokichar Basin, 1995.

. Plio-pleistocene, Omo Group " deposits, that include the Nachukui Formation in the 892 northwest part of the Turkana Basin. The sediments of the Kibish Formation type- 893 section outcrop further north, on the right bank of the Omo River, pp.9-894

T. Basin, (d) Topographic map, 1989.

. Tiercelin, 2012a) and fieldwork. The three geophysical profiles are 907 superimposed on these geological cross-sections, respectively: the southern profile P1 908 (which is also superimposed to the trace of the TVK-10 seismic line acquired by the 909

A. Company and ). , the central profile P2, and the northern profile P3. For the southern 910 profile, the interpretation of the TVK-10 seismic line in the hanging, p.911

. Wescott, On the 3 geological cross- 912 sections, the continuous grey line represents the geophysical profiles, and the x-axis 913 represents the distance (km) from the western shore of Lake Turkana. The dashed 914 boxes delineate the study areas where the conceptual geological models (see Fig, 1999.

T. Basin, Large cooling structures such as columnar jointing (e) and tores 937 (f) are well developed within the basaltic flows of the ''Turkana Volcanics'', and may 938 explain the observed low average resistivity values. (g) Wide volcanic dykes and thick 939 sills are abundant in the area of the P2 and P3 profiles (Lokitaung Gorge, Kerral area 940 and north of Lapur Peak)

. Fig, This dyke (marked by the black boulders on the photo) is dated 27

M. Tiercelin, Larger dykes (up to 70 m) are known in the northern 945 part of the Turkana Basin as well as in Southern Ethiopia, 2000.