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Pleistocene fossil woods from the Okote Member, site FwJj 14 in the Ileret region, Koobi Fora Formation, northern Kenya.
J Hum Evol 2017; 112:134-147JH

Abstract

On the eastern side of Lake Turkana in northern Kenya are extensive Plio-Pleistocene deposits containing a rich diversity of fossil mammals, hominins and flora within the radiometrically dated tuffaceous, lacustrine and fluvial sequence. Reconstruction of this landscape and paleoenvironment are part of an ongoing multinational and multidisciplinary human evolution project in the eastern Turkana Basin. Today there is a huge lake in the Rift Valley but it has fluctuated since the early Pliocene. Silicified wood is fairly common in some areas of the Koobi Fora Formation. One such site is FwJj 14E, alongside one of the tributaries of the Ileret River. Hominin hand and arm bones have been excavated from here in the Okote Member and dated at 1.56-1.36 Ma. The fossils are associated with hominin and bovid footprints. Sixty of the over 100 wood specimens collected have been sectioned and studied. In general the woods have large vessels and an average vulnerability index of 40, which implies a mesic megathermal environment with no water stress. Taxonomically the woods belong to large African families: Caesalpiniaceae (Didelotia idae), Combretaceae (Anogeissus sp.), Putranjivaceae (Euphorbiaceae; Drypetes sp.), Lamiaceae (cf Premna sp.), Malvaceae (Heritiera sp.) and Sapindaceae (Sapindoxylon sp.). Most of these taxa do not occur in the area today because now it is much drier and the local vegetation is predominantly Acacia-Commiphora-Salvadora shrubland. The reconstruction of the paleovegetation supports the interpretation from the fauna, namely, a tall riverine forest with shady refuge trees, possibly some edible fruits, and wooded grassland and more open bushland in the vicinity.

Authors+Show Affiliations

Evolutionary Studies Institute and School of Geosciences, University of the Witwatersrand, Private Bag 3, WITS 2050, Johannesburg, South Africa. Electronic address: Marion.bamford@wits.ac.za.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28882548

Citation

Bamford, Marion K.. "Pleistocene Fossil Woods From the Okote Member, Site FwJj 14 in the Ileret Region, Koobi Fora Formation, Northern Kenya." Journal of Human Evolution, vol. 112, 2017, pp. 134-147.
Bamford MK. Pleistocene fossil woods from the Okote Member, site FwJj 14 in the Ileret region, Koobi Fora Formation, northern Kenya. J Hum Evol. 2017;112:134-147.
Bamford, M. K. (2017). Pleistocene fossil woods from the Okote Member, site FwJj 14 in the Ileret region, Koobi Fora Formation, northern Kenya. Journal of Human Evolution, 112, pp. 134-147. doi:10.1016/j.jhevol.2017.08.003.
Bamford MK. Pleistocene Fossil Woods From the Okote Member, Site FwJj 14 in the Ileret Region, Koobi Fora Formation, Northern Kenya. J Hum Evol. 2017;112:134-147. PubMed PMID: 28882548.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Pleistocene fossil woods from the Okote Member, site FwJj 14 in the Ileret region, Koobi Fora Formation, northern Kenya. A1 - Bamford,Marion K, Y1 - 2017/09/04/ PY - 2016/06/07/received PY - 2017/07/31/revised PY - 2017/08/01/accepted PY - 2017/9/9/pubmed PY - 2018/5/15/medline PY - 2017/9/9/entrez KW - Angiosperm woods KW - Forest KW - Lake Turkana KW - Multiple use of plants KW - Palaeovegetation SP - 134 EP - 147 JF - Journal of human evolution JO - J. Hum. Evol. VL - 112 N2 - On the eastern side of Lake Turkana in northern Kenya are extensive Plio-Pleistocene deposits containing a rich diversity of fossil mammals, hominins and flora within the radiometrically dated tuffaceous, lacustrine and fluvial sequence. Reconstruction of this landscape and paleoenvironment are part of an ongoing multinational and multidisciplinary human evolution project in the eastern Turkana Basin. Today there is a huge lake in the Rift Valley but it has fluctuated since the early Pliocene. Silicified wood is fairly common in some areas of the Koobi Fora Formation. One such site is FwJj 14E, alongside one of the tributaries of the Ileret River. Hominin hand and arm bones have been excavated from here in the Okote Member and dated at 1.56-1.36 Ma. The fossils are associated with hominin and bovid footprints. Sixty of the over 100 wood specimens collected have been sectioned and studied. In general the woods have large vessels and an average vulnerability index of 40, which implies a mesic megathermal environment with no water stress. Taxonomically the woods belong to large African families: Caesalpiniaceae (Didelotia idae), Combretaceae (Anogeissus sp.), Putranjivaceae (Euphorbiaceae; Drypetes sp.), Lamiaceae (cf Premna sp.), Malvaceae (Heritiera sp.) and Sapindaceae (Sapindoxylon sp.). Most of these taxa do not occur in the area today because now it is much drier and the local vegetation is predominantly Acacia-Commiphora-Salvadora shrubland. The reconstruction of the paleovegetation supports the interpretation from the fauna, namely, a tall riverine forest with shady refuge trees, possibly some edible fruits, and wooded grassland and more open bushland in the vicinity. SN - 1095-8606 UR - https://www.unboundmedicine.com/medline/citation/28882548/Pleistocene_fossil_woods_from_the_Okote_Member,_site_FwJj_14_in_the_Ileret_region,_Koobi_Fora_Formation,_northern_Kenya L2 - https://linkinghub.elsevier.com/retrieve/pii/S0047-2484(17)30343-3 DB - PRIME DP - Unbound Medicine ER -