Geology and late Cainozoic lake sediments of the Suguta Trough, Kenya

Truckle, P. H.

doi:10.1038/263380a0

Cited by 40 publications

(14 citation statements)

References 9 publications

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“…During the AHP, paleo-Lake Suguta rose more than 300 m and overflowed into Lake Turkana (Truckle, 1976;Dunkley et al, 1993;Garcin et al, 2009;Junginger et al, 2014). The late Pleistoceneearly Holocene lake-level changes in the Suguta Valley triggered the accumulation of voluminous delta deposits (Figs.…”

Section: Geology and Climate Of The Northern Kenya Riftmentioning

confidence: 99%

Short-lived increase in erosion during the African Humid Period: Evidence from the northern Kenya Rift

Garcin

Schildgen

Acosta

et al. 2017

Earth and Planetary Science Letters

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The African Humid Period (AHP) between ∼15 and 5.5 cal. kyr BP caused major environmental change in East Africa, including filling of the Suguta Valley in the northern Kenya Rift with an extensive (∼2150 km 2 ), deep (∼300 m) lake. Interfingering fluvio-lacustrine deposits of the Baragoi paleo-delta provide insights into the lake-level history and how erosion rates changed during this time, as revealed by delta-volume estimates and the concentration of cosmogenic 10 Be in fluvial sand. Erosion rates derived from delta-volume estimates range from 0.019 to 0.03 mm yr −1 . 10 Be-derived paleo-erosion rates at ∼11.8 cal. kyr BP ranged from 0.035 to 0.086 mm yr −1 , and were 2.7 to 6.6 times faster than at present. In contrast, at ∼8.7 cal. kyr BP, erosion rates were only 1.8 times faster than at present. Because 10 Bederived erosion rates integrate over several millennia, we modeled the erosion-rate history that best explains the 10 Be data using established non-linear equations that describe in situ cosmogenic isotope production and decay. Two models with different temporal constraints (15-6.7 and 12-6.7 kyr) suggest erosion rates that were ∼25 to ∼300 times higher than the initial erosion rate (pre-delta formation). That pulse of high erosion rates was short (∼4 kyr or less) and must have been followed by a rapid decrease in rates while climate remained humid to reach the modern 10 Be-based erosion rate of ∼0.013 mm yr −1 .Our simulations also flag the two highest 10 Be-derived erosion rates at ∼11.8 kyr BP related to nonuniform catchment erosion. These changes in erosion rates and processes during the AHP may reflect a strong increase in precipitation, runoff, and erosivity at the arid-to-humid transition either at ∼15 or ∼12 cal. kyr BP, before the landscape stabilized again, possibly due to increased soil production and denser vegetation.

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Section: Geology and Climate Of The Northern Kenya Riftmentioning

confidence: 99%

Short-lived increase in erosion during the African Humid Period: Evidence from the northern Kenya Rift

Garcin

Schildgen

Acosta

et al. 2017

Earth and Planetary Science Letters

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“…MSA artifacts are sparse from western Turkana (e.g., Whitworth, 1965), and much of the Rift Valley between Lake Baringo and Lake Turkana remains to be archaeologically surveyed; potentially promising are the late Pleistocene and younger deposits of paleo-Lake Suguta north of Silali (Truckle, 1976;Casanova et al, 1988;Dunkley et al, 1993;Sturchio et al, 1993;Trauth et al, 2005), where only sparse Holocene-aged material with poor provenience has thus far been reported (Sutton, 1990) due to minimal investigation. Defining the nature, scale, and chronology of regional differences among Middle Stone Age sites is a critical task still confronting archaeologists.…”

Section: Discussionmentioning

confidence: 99%

The Middle Stone Age of the northern Kenyan Rift: age and context of new archaeological sites from the Kapedo Tuffs

Tryon

Roach

Logan

2008

Journal of Human Evolution

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“…12). Bishop (1975), Truckle (1976) and Yuretich (1976) suggest a hydrographic junction between Lake Turkana and 'Lake Suguta' through the Kerio and Kamuge valleys during the early Holocene. Thus the hypothesis that 'Lake Suguta' was fed by the waters of Lake Kokwob (the late Pleistocene -early Holocene ancestor of Lake Baringo) flowing through the permeable volcaniclastics of the Lobat pass during high water periods can be examined.…”

Section: Discussionmentioning

confidence: 99%

The sponge Dosilia brouni (Spongillidae) in Lake Baringo, Gregory Rift, Kenya

Vacelet

Tiercelin²,

Gasse³

1991

Hydrobiologia

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Living specimens of the sponge Dosilia brouni (Kirkpatrick, 1906), which had previously been found only in its type locality on the White Nile, have been discovered in Lake Baringo (Kenya). The sponge also occurs as subfossil gemmules embedded in the sediment. Its description is completed using light and scanning electron microscopy and physicochemical data on the habitat are given. The paleogeographical significance of this observation is discussed.

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Geology and late Cainozoic lake sediments of the Suguta Trough, Kenya

Cited by 40 publications

References 9 publications

Short-lived increase in erosion during the African Humid Period: Evidence from the northern Kenya Rift

Short-lived increase in erosion during the African Humid Period: Evidence from the northern Kenya Rift

The Middle Stone Age of the northern Kenyan Rift: age and context of new archaeological sites from the Kapedo Tuffs

The sponge Dosilia brouni (Spongillidae) in Lake Baringo, Gregory Rift, Kenya

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