U-Th dated late Pleistocene tufas linked to human occupation in the semi-arid southern Kalahari

2021 ◽  
Author(s):  
Jessica von der Meden ◽  
Jayne Wilkins ◽  
Benjamin Schoville ◽  
Kyle Brown ◽  
Robyn Pickering
Keyword(s):  
South Africa ◽  
Summer Rainfall ◽  
Middle Stone Age ◽  
Annual Rainfall ◽  
Human Populations ◽  
Stone Age ◽  
Human Occupation ◽  
Cape Coast ◽  
Climate Conditions ◽  
Semi Arid

<p>Ga-Mohana Hill North Rockshelter (GHN) in the Northern Cape Province of South Africa is situated within the Summer Rainfall Zone, in the semi-arid (~300-400mm mean annual rainfall) southeastern edge of the Kalahari Basin. This location is significant as the dominant narrative for the evolution of modern humans has focused on Middle Stone Age archaeological sites along the southern cape coast of South Africa, with coastal resources and favourable climate conditions argued as key factors in driving the evolution of <em>Homo sapiens</em>. Semi-arid regions in the interior of South Africa, such as the southern Kalahari Basin, are often considered to have been too dry to sustain significant human occupation and activity, and have thus been overlooked. However, GHN does indeed preserve rich stratified Middle and Later Stone Age deposits, as well as abundant large relict tufa deposits that cover the surrounding hillside. These tufas, which are ambient temperature, freshwater calcium carbonate deposits, are indicative of past periods of flowing surface waters and shallow pools on the hillside. Laser ablation trace element mapping was used to pre-screen the tufa samples to target layers with high <sup>238</sup>U and little to no <sup>232</sup>Th concentration for U-Th dating. The resultant ages show that the tufa system at Ga-Mohana was active during five distinct intervals over the last 110 ka, three of which closely coincide with the timing of human occupation at the site, itself dated via OSL. The coincidence of tufa formation and human occupation suggests that the tufa-forming waters were a critical resource to human populations living in the area. This hitherto undiscovered source of fresh water, more than 600 km inland and as far back as 110 ka, stands to challenge the notion of an empty and arid interior.</p>

Multiproxy record of late Quaternary climate change and Middle Stone Age human occupation at Wonderkrater, South Africa

2014 ◽  
Vol 99 ◽  
pp. 42-59 ◽  
Author(s):  
Lucinda R. Backwell ◽  
Terence S. McCarthy ◽  
Lyn Wadley ◽  
Zoë Henderson ◽  
Christine M. Steininger ◽  
...  
Keyword(s):  
Climate Change ◽  
South Africa ◽  
Late Quaternary ◽  
Middle Stone Age ◽  
Stone Age ◽  
Human Occupation ◽  
Quaternary Climate

scholarly journals Development of Middle Stone Age innovation linked to rapid climate change

2013 ◽  
Vol 4 (1) ◽  
Author(s):  
Martin Ziegler ◽  
Margit H. Simon ◽  
Ian R. Hall ◽  
Stephen Barker ◽  
Chris Stringer ◽  
...  
Keyword(s):  
Climate Change ◽  
South Africa ◽  
South African ◽  
Ocean Circulation ◽  
Modern Human ◽  
Middle Stone Age ◽  
Sub Saharan Africa ◽  
Human Populations ◽  
Stone Age ◽  
Sub Saharan

Abstract The development of modernity in early human populations has been linked to pulsed phases of technological and behavioural innovation within the Middle Stone Age of South Africa. However, the trigger for these intermittent pulses of technological innovation is an enigma. Here we show that, contrary to some previous studies, the occurrence of innovation was tightly linked to abrupt climate change. Major innovational pulses occurred at times when South African climate changed rapidly towards more humid conditions, while northern sub-Saharan Africa experienced widespread droughts, as the Northern Hemisphere entered phases of extreme cooling. These millennial-scale teleconnections resulted from the bipolar seesaw behaviour of the Atlantic Ocean related to changes in the ocean circulation. These conditions led to humid pulses in South Africa and potentially to the creation of favourable environmental conditions. This strongly implies that innovational pulses of early modern human behaviour were climatically influenced and linked to the adoption of refugia.

scholarly journals Shellfish exploitation during the Oakhurst at Klipdrift Cave, southern Cape, South Africa

2019 ◽  
Vol 115 (9/10) ◽  
Author(s):  
Kokeli P. Ryano ◽  
Karen L. van Niekerk ◽  
Sarah Wurz ◽  
Christopher S. Henshilwood
Keyword(s):  
South Africa ◽  
Ecological Factors ◽  
Middle Stone Age ◽  
Sea Surface ◽  
Human Populations ◽  
Stone Age ◽  
Later Stone Age ◽  
Sea Levels ◽  
Experimental Works ◽  
Blombos Cave

Klipdrift Cave in the southern Cape, South Africa, provides new insights into shellfish harvesting during the Later Stone Age (14–9 ka) period associated with the Oakhurst techno-complex. Two shellfish species dominate: Turbo sarmaticus and Dinoplax gigas. An abrupt shift in the relative frequencies of these species occurs in the middle of the sequence with T. sarmaticus almost completely replacing D. gigas. The shift in dominant species is likely due to environmental change caused by fluctuating sea levels rather than change in sea surface temperatures. The shellfish assemblage shows that local coastal habitats at Klipdrift Cave were somewhat different from those of contemporaneous sites in the southern Cape. Although the shellfish specimens are smaller at Klipdrift Cave than those from Middle Stone Age localities such as Blombos Cave, there is no robust indication that larger human populations at Klipdrift Cave during the Oakhurst period might have caused this change in size. Environmental or ecological factors could have restricted shellfish growth rates as some experimental works have suggested, but this possibility also remains to be further explored.

Vegetation and environmental changes at the Middle Stone Age site of Wonderkrater, Limpopo, South Africa

2017 ◽  
Vol 88 (2) ◽  
pp. 313-326 ◽  
Author(s):  
Elysandre Puech ◽  
Dunia H. Urrego ◽  
María Fernanda Sánchez Goñi ◽  
Lucinda Backwell ◽  
Francesco d’Erricoc
Keyword(s):  
South Africa ◽  
Water Table ◽  
Environmental Changes ◽  
Regional Climate ◽  
Middle Stone Age ◽  
Stone Age ◽  
Human Occupation ◽  
Lithic Assemblages ◽  
Stage 4 ◽  
Age Estimates

AbstractWonderkrater, a Middle Stone Age site in the interior of South Africa, is a spring and peat mound featuring both paleoclimatic and archaeological records. The site preserves three small MSA lithic assemblages with age estimates of 30 ka, >45 ka and 138.01±7.7 ka. Here we present results of the pollen analysis of a core retrieved from the middle of the peat mound, which covers, with hiatuses, the timespan between ca. 70±10 ka and 30 ka. Pollen percentages of terrestrial, local aquatic, and semi-aquatic plants reveal changes in the regional climate and in the water table of the spring. Results identify regional wet conditions at ca. 70±10 ka, followed by a dry and a wet period between 60 ka and 30 ka. Superimposed on these three phases, recurring changes in the size and depth of the water table are observed between >45 ka and 30 ka. Wet conditions at 70 ka and 30 ka are tentatively correlated here with Marine Isotope Stage 4 and Heinrich Stadial 3, respectively. A warm and dry savanna landscape was present during human occupation older than 45 ka, and a wet phase was contemporaneous with the final occupation, dated at ~30 ka.

scholarly journals Early, intensive marine resource exploitation by Middle Stone Age humans at Ysterfontein 1 rockshelter, South Africa

2021 ◽  
Vol 118 (16) ◽  
pp. e2020042118
Author(s):  
Elizabeth M. Niespolo ◽  
Warren D. Sharp ◽  
Graham Avery ◽  
Todd E. Dawson
Keyword(s):  
South Africa ◽  
Local Environment ◽  
Modern Human ◽  
Middle Stone Age ◽  
Human Populations ◽  
Western Cape ◽  
Stone Age ◽  
Resource Exploitation ◽  
Shell Midden ◽  
Coastal Adaptation

Modern human behavioral innovations from the Middle Stone Age (MSA) include the earliest indicators of full coastal adaptation evidenced by shell middens, yet many MSA middens remain poorly dated. We apply 230Th/U burial dating to ostrich eggshells (OES) from Ysterfontein 1 (YFT1, Western Cape, South Africa), a stratified MSA shell midden. 230Th/U burial ages of YFT1 OES are relatively precise (median ± 2.7%), consistent with other age constraints, and preserve stratigraphic principles. Bayesian age–depth modeling indicates YFT1 was deposited between 119.9 to 113.1 thousand years ago (ka) (95% CI of model ages), and the entire 3.8 m thick midden may have accumulated within ∼2,300 y. Stable carbon, nitrogen, and oxygen isotopes of OES indicate that during occupation the local environment was dominated by C3 vegetation and was initially significantly wetter than at present but became drier and cooler with time. Integrating archaeological evidence with OES 230Th/U ages and stable isotopes shows the following: 1) YFT1 is the oldest shell midden known, providing minimum constraints on full coastal adaptation by ∼120 ka; 2) despite rapid sea-level drop and other climatic changes during occupation, relative shellfish proportions and sizes remain similar, suggesting adaptive foraging along a changing coastline; 3) the YFT1 lithic technocomplex is similar to other west coast assemblages but distinct from potentially synchronous industries along the southern African coast, suggesting human populations were fragmented between seasonal rainfall zones; and 4) accumulation rates (up to 1.8 m/ka) are much higher than previously observed for dated, stratified MSA middens, implying more intense site occupation akin to Later Stone Age middens.

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