A pleistocene palaeovegetation record from plant wax biomarkers from the nachukui formation, West Turkana, Kenya

Kevin T. Uno, Pratigya J. Polissar, Emma Kahle, Craig Feibel, Sonia Harmand, Hélène Roche, Peter B. de Menocal

Research output: Contribution to journalArticlepeer-review

33 Scopus citations

Abstract

Reconstructing vegetation at hominin fossil sites provides us critical infor-mation about hominin palaeoenvironments and the potential role of climate in their evolution. Here we reconstruct vegetation from carbon isotopes of plant wax biomarkers in sediments of the Nachukui Formation in the Turkana Basin. Plant wax biomarkers were extracted from samples from a wide range of lithologies that include fluvial-lacustrine sediments and palaeosols, and therefore provide a record of vegetation from diverse depositional environ-ments. Carbon isotope ratios from biomarkers indicate a highly dynamic vegetation structure (ca 5-100% C4 vegetation) from 2.3 to 1.7 Ma, with an overall shift towards more C4 vegetation on the landscape after about 2.1 Ma. The biomarker isotope data indicate ca 25-30% more C4 vegetation on the landscape than carbon isotope data of pedogenic carbonates from the same sequence. Our data show that the environments of early Paranthropus and Homo in this part of the Turkana Basin were primarily mixed C3-C4 to C4-dominated ecosystems. The proportion of C4-based foods in the diet of Paranthropus increases through time, broadly paralleling the increase in C4 veg-etation on the landscape, whereas the diet of Homo remains unchanged. Biomarker isotope data associated with the Kokiselei archaeological site complex, which includes the site where the oldest Acheulean stone tools to date were recovered, indicate 61-97% C4 vegetation on the landscape.

Original languageEnglish (US)
Article number20150235
JournalPhilosophical Transactions of the Royal Society B: Biological Sciences
Volume371
Issue number1698
DOIs
StatePublished - Jul 5 2016

All Science Journal Classification (ASJC) codes

  • Biochemistry, Genetics and Molecular Biology(all)
  • Agricultural and Biological Sciences(all)

Keywords

  • Acheulean tools
  • Carbon isotope
  • Hominin palaeoenvironment
  • Leaf wax
  • Pedogenic carbonate

Fingerprint

Dive into the research topics of 'A pleistocene palaeovegetation record from plant wax biomarkers from the nachukui formation, West Turkana, Kenya'. Together they form a unique fingerprint.

Cite this