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Kibish Formation

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Stratigraphic relations between the Kibish Formation in its type area and at Natodomeri I, where KNM-ND 59673 was recovered.
Published: 09 November 2017
Figure 2 Stratigraphic relations between the Kibish Formation in its type area and at Natodomeri I, where KNM-ND 59673 was recovered.
Journal Article
Published: 01 January 2006
Journal of the Geological Society (2006) 163 (1): 185–204.
... 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. 17 6 2005 14 12 2004 Fifteen different tuffs have been analysed...
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Journal Article
Published: 09 November 2017
Journal of Paleontology (2018) 92 (2): 305–312.
...Figure 2 Stratigraphic relations between the Kibish Formation in its type area and at Natodomeri I, where KNM-ND 59673 was recovered. ...
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Image
Map of the region near the Natodomeri fossil sites. Strata at these sites are at the same elevation as strata in the type area of the Kibish Formation in the NE corner of this map. Contours above 455 m are not shown.
Published: 09 November 2017
Figure 1 Map of the region near the Natodomeri fossil sites. Strata at these sites are at the same elevation as strata in the type area of the Kibish Formation in the NE corner of this map. Contours above 455 m are not shown.
Journal Article
Published: 01 January 1979
Bulletin de la Société Géologique de France (1979) S7-XXI (3): 259–263.
...J. L. Ballais GeoRef, Copyright 2004, American Geological Institute. 1979 Africa Cenozoic cuestas East Africa erosion features Ethiopia fault scarps geomorphology Holocene Kibish Formation landform evolution lower Pleistocene Nakwas Neogene Omo River Omo Valley...
Journal Article
Journal: Elements
Published: 01 April 2023
Elements (2023) 19 (2): 88–95.
... - 168 , doi: 10.1016/j.quascirev.2016.09.020 Brown FH , McDougall I , Fleagle JG ( 2012 ) Correlation of the KHS Tuff of the Kibish Formation to volcanic ash layers at other sites, and the age of early Homo sapiens (Omo I and Omo II) . Journal of Human Evolution 63 : 577...
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Image
(A) Synthetic stratigraphic logs of the Kibish, Konso, and Herto Bouri formations in Ethiopia, showing tephrostratigraphic correlations that provide minimum ages for the Homo sapiens fossils Omo I (Vidal et al. 2022a) and Herto (Clark et al. 2003), and source eruptions (stars). SVT = Silver Tuff; KHS = Kamoya’s Hominid Site Tuff; LHM = Lower Herto Member; UHM = Upper Herto Member; and WAVT = Waidedo Vitric Tuff. Modified from Vidal et al. (2022a). (B) Major element abundances and trace element ratios of glasses from the ca. 233-ka Shala Qi2 eruption, the ca. 177-ka Corbetti eruption, the Kibish KHS and ETH18-8 tuffs, and Konso TA-56 tuffs in (A). Major element data are normalized to 100% anhydrous. Error bars shown are relative standard deviations, rescaled to the value of the center point. Published data for the Herto WAVT and Konso TA-55 tuffs are not compared with data plotted here because of the different analytical methods used. Modified fromVidal et al. (2022a).
Published: 01 April 2023
Figure 4. ( A ) Synthetic stratigraphic logs of the Kibish, Konso, and Herto Bouri formations in Ethiopia, showing tephrostratigraphic correlations that provide minimum ages for the Homo sapiens fossils Omo I ( Vidal et al. 2022a ) and Herto ( Clark et al. 2003 ), and source eruptions (stars
Journal Article
Published: 01 March 2008
Journal of the Geological Society (2008) 165 (2): 549–562.
... c . 32 m above the base of the Shungura Formation ( de Heinzelin 1983 ). On the basis of glass analyses, Brown & Fuller (2008) showed that the Lokochot (= A) Tuff also occurs in the Nkalabong Formation ( Butzer 1971, 1976 ) in the Kibish area ( Fig. 1 ), and there it contains pumice clasts...
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Image
Composite stratigraphic sections of the main formations in the Omo–Turkana Basin, together with the results of 40Ar/39Ar dating of mainly alkali feldspars from pumice clasts within tuffs (McDougall & Brown 2006, 2008; this study). Ages determined here are shown in bold and in a larger size. The main tuffaceous beds are shown in black, often named, and correlations between the stratigraphic columns are shown by grey lines. The Shungura Formation composite section is after de Heinzelin (1983), the Koobi Fora Formation is mainly from Brown & Feibel (1986), noting 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 (2007). To the left of the stratigraphic columns for the Koobi Fora and Shungura formations are the measured magnetic polarities, where grey shading represents normal polarity and unshaded indicates reversed polarity. Data are from Hillhouse et al. (1986) and Lepre & Kent (2010) for the Koobi Fora Formation and after Brown et al. (1978) and Kidane et al. (2007) for the Shungura Formation. The ages shown for the polarity boundaries are from Gradstein et al. (2004).
Published: 01 March 2012
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
Journal Article
Journal: Geology
Published: 01 December 2008
Geology (2008) 36 (12): 967–970.
..., 2008 ). The apparently oldest fossils assigned to H. sapiens are from the Kibish Formation in the Omo, bracketed by 40 Ar/ 39 Ar dates to between 104 ± 14 ka and 196 ± 4 ka, with an inferred age of 195 ± 10 ka ( McDougall et al., 2005 ). H. sapiens from Herto are dated by 40 Ar/ 39 Ar to between 160...
FIGURES
Journal Article
Journal: Geology
Published: 01 June 2001
Geology (2001) 29 (6): 499–502.
.... , Roeland , J.C. , and Guiot , J. , 1990 , Temperature and rainfall estimates for the past 40 000 years in equatorial Africa : Nature , v. 346 p. 347 – 348 . Butzer , K.W. , Brown , F.W. , and Thruber , D.L. , 1969 , Horizontal sediments of the lower Omo valley; the Kibish...
FIGURES
Journal Article
Published: 01 January 2006
Journal of the Geological Society (2006) 163 (1): 205–220.
... in appearance, others pale grey. These pumice clasts have abundant anorthoclase phenocrysts, readily separated for dating purposes. The Chibele Tuff is overlain by about 2 m of mudstone and followed upward disconformably by about 5 m of sediments assigned to the much younger Kibish Formation ( Butzer...
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Journal Article
Published: 01 March 2012
Journal of the Geological Society (2012) 169 (2): 213–226.
... 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...
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Journal Article
Published: 01 January 2004
Geological Magazine (2004) 141 (1): 41–53.
... Foundation, the National Geographic Society, and the L. S. B. Leakey Foundation to F. H. Brown for work on the Koobi Fora and Nachukui formations, by grants to John G. Fleagle and F. H. Brown for work on the Kibish Formation, and by grants to Meave G. Leakey for work at Koobi Fora, Lothagam and Kanapoi...
FIGURES
Journal Article
Journal: Elements
Published: 01 April 2023
Elements (2023) 19 (2): 75–81.
... , pp 285 – 312 Brown FH , Fuller CR ( 2008 ) Stratigraphy and tephra of the Kibish Formation, southwestern Ethiopia . Journal of Human Evolution 55 : 366 - 403 , doi: 10.1016/j.jhevol.2008.05.009 Campisano CJ , Feibel CS ( 2008 ) Depositional environments...
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Journal Article
Journal: GSA Bulletin
Published: 01 February 2000
GSA Bulletin (2000) 112 (2): 163–176.
... the region into four approximately north-south–trending, fault-bounded valleys comprising two or more basins ( Figs. 3 and 4 ). The Kibish basin marks the northward extent of the West Turkana rift of northern Kenya, which contains Eocene(?)–Oligocene to Pliocene volcanic strata interbedded...
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Journal Article
Journal: Elements
Published: 01 April 2023
Elements (2023) 19 (2): 82–87.
... (Pangani), and southwestern Tanzania (Rukwa-Malawi) also show evidence for renewed faulting and exhumation at 60–45 Ma. The brown ellipse outlines an area of ~7-Ma magmatism and platform formation in the Indian Ocean between Africa and Madagascar. Nm indicates the Nyamuragira Volcano, and Ng indicates...
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Journal Article
Journal: Geology
Published: 01 September 2007
Geology (2007) 35 (9): 831–834.
... that precipitation levels greater than 80 mm/yr could not have persisted for periods longer than tens to hundreds of years ( Amit et al., 2006 ). Thus, the wet episodes were too short to cause the development of calcite horizons in the soils but long enough to allow the formation of thin speleothem laminae...
FIGURES
Journal Article
Journal: Elements
Published: 01 April 2023
Elements (2023) 19 (2): 96–103.
... ; Gebregiorgis et al. 2021 ), the Pleistocene Naivasha Basin, Kenya ( Trauth et al. 2001 ), and the Pliocene–Pleistocene Chemeron Formation of the Baringo Basin, Kenya ( Minkara 2017 ). Analcime indicates more saline conditions because it is favored by a higher Na/K ratio, typical of more saline conditions...
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Journal Article
Published: 01 May 2008
American Mineralogist (2008) 93 (5-6): 784–795.
... Ar experimental results from four tuff beds Isochron Analysis* Apparent Ages* Name (formation) mineral analysis type location n SUMS (N – 2) 40 Ar/ 36 Ari ± 2 σ Isochron Age (Ma) ± 2σ‡ average K/Ca ± 2σ MSWD Weighted Mean Age (Ma) ± 2σ‡ ±2σ§ ±2σ|| Notes...
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