Cosmogenic nuclide age constraints on Middle Stone Age lithics from Niassa, Mozambique

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• 作者：Julio Mercader ; John C. Gosse ; Tim Bennett ; Alan J. Hidy ; Dylan H. Rood
• 关键词：Mozambique ; Lake Malawi/Niassa ; Luchamange Beds ; Abrupt erosion ; Surface processes ; Mvumu ; Cosmogenic nuclide dating ; Final Middle Stone Age
• 刊名：Quaternary Science Reviews
• 出版年：2012
• 出版时间：30 July, 2012
• 年：2012
• 卷：47
• 期：Complete
• 页码：116-130
• 全文大小：2407 K

文摘

The late phases of the Middle Stone Age (MSA) in the East African Rift System (EARS) are known for their evolutionary shifts and association with bottlenecks, transcontinental expansion, and climatic fluctuations. The chronology of MSA sites contemporaneous with these eco-demographic upheavals is uncertain because of the scarcity of datable sites and the poor understanding of their depositional and erosional histories. We apply terrestrial cosmogenic nuclide dating in a stratigraphic section with a complex exposure history to the study of the Luchamange Beds, a widespread sedimentological unit underlying MSA sites from the shores of Lake Niassa (Mozambican EARS). We use an innovative approach, which may be applicable elsewhere, to calculate their age using a Monte Carlo-based Bayesian model that links depth profiles of 26Al and 10Be, and uses other geomorphic and cosmogenic nuclide age constraints on episodic erosion and burial. The age of the basal Luchamange Beds is 42?+?77/?15 ka, and the MSA occupation on top is 29?+?3/?11 ka. These dates suggest temporal overlap between MSA and the earliest Later Stone Age and diversity in cultural manifestations at the end of the MSA.