Evidence for rapid faunal change in the early Miocene of East Africa based on revised biostratigraphic and radiometric dating of Bukwa, Uganda

Journal of Human Evolution
Susanne M CoteLaura MacLatchy

Abstract

Field expeditions to Bukwa in the late 1960s and early 1970s established that the site had a small but diverse early Miocene fauna, including the catarrhine primate Limnopithecus legetet. Initial potassium-argon radiometric dating indicated that Bukwa was 22 Ma, making it the oldest of the East African early Miocene fossil localities known at the time. In contrast, the fauna collected from Bukwa was similar to other fossil localities in the region that were several million years younger. This discrepancy was never resolved, and due to the paucity of primate remains at the site, little subsequent research took place. We have collected new fossils at Bukwa, reanalyzed the existing fossil collections, and provided new radiometric dating. 40Ar/39Ar incremental heating ages on lavas bracketing the site indicate that the Bukwa fossils were deposited ∼19 Ma, roughly 3 Ma younger than the original radiometric age. Our radiometric dating results are corroborated by a thorough reanalysis of the faunal assemblage. Bukwa shares taxa with both stratigraphically older localities (Tinderet, Napak) and with stratigraphically younger localities (Kisingiri, Turkana Basin) perfectly corresponding to our revised radiometric age. This revised age f...Continue Reading

References

Jan 1, 1988·Folia primatologica; international journal of primatology·T Harrison
Apr 18, 1997·Science·D L GeboD Pilbeam
Apr 26, 2008·Science·K F KuiperJ R Wijbrans
Dec 16, 2011·Evolutionary Anthropology·Meave LeakeyJohn G Fleagle

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Citations

Aug 2, 2019·Journal of Behavioral Medicine·Vivian H LyonsAli Rowhani-Rahbar

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