Palaeoecology of giraffe tracks in Late Pleistocene aeolianites on the Cape south coast (original) (raw)
Related papers
South African Journal of Geology, 2021
Analyses of faunal remains are a key means of inferring palaeoenvironmental change. In this paper, the use of faunal remains as a proxy for environmental conditions from Marine Isotope Stage 6 to the Holocene in southern Africa is reviewed. The focus of this review is on large herbivore abundance and how these fluctuate temporally and regionally in accordance with palaeo-climatic shifts. Here, southern Africa is divided into four eco-regions loosely based on climatic, biotic and zoogeographic traits: the Cape Floristic Region, the arid and semi-arid region, the savanna and grassland region, and the wetter eastern region. The relative abundance of large herbivores within these regions are noted, and temporal trends are inferred. On the whole, most eco-regions maintain similar herbivore compositions over time showing the regional ecological resilience of these taxa to local-scale environmental change. Yet some changes in faunal frequencies are apparent. The Cape Floristic Region shows evidence of significant faunal turnover from the Late Pleistocene to the Holocene. Here, grazers are significantly more abundant during glacial periods, probably linked to the terrestrial expansion of the palaeo-Agulhas coastal plain. Shifts in ungulate abundance in the currently xeric central interior, also indicate wetter periods in the Pleistocene. Holocene faunas are generally similar to historic distributions but shifts between xeric and mesic periods are also evident.
The Pleistocene fauna of the Cape south coast revealed through ichnology at two localities
South African Journal of Science, 2018
East of Still Bay on the Cape south coast of South Africa lies a rugged, remote stretch of sea cliffs that expose Late Pleistocene aeolianites. A zone of dense concentration of fossil tracks occurs within this area. Two large rocks, which we call Roberts Rock and Megafauna Rock, were identified ~400 metres apart. These rocks contained a variety of trackways, individual tracks, burrow traces and invertebrate trace fossils on multiple bedding planes. Both rocks were found ex situ, but their context could be determined. Roberts Rock has subsequently slid into the ocean, and Megafauna Rock lies at the base of a coastal cliff. Probable trackmakers include elephant, long-horned buffalo, giant Cape horse, rhinoceros, medium and small artiodactyls, golden mole, birds and invertebrates. Dating studies at an adjacent site, which is comparable to the stratigraphy described here, indicate that both rocks were most likely deposited in Marine Isotope Stage 5e (~128–116 ka). Analysis and descripti...
Middle Stone Age South Africa GIS model Archaeology Ungulate paleoecology Migration Fossils Greater Cape Floristic Region Intra-tooth a b s t r a c t Middle Stone Age sites located within the Greater Cape Floristic Region on the South African southern coast have material culture with early evidence for key modern human behaviors such as projectile weaponry, large animal hunting, and symbolic behavior. In order to interpret how and why these changes evolved, it is necessary to understand their ecological context as it has direct relevance to foraging behavior. During periods of lowered sea level, a largely flat and vast expanse of land existed south of the modern coastline, but it is now submerged by higher sea levels. This exposed area, the Paleo-Agulhas Plain, likely created an ecological context unlike anything in the region today, as evidenced by fossil assemblages dominated by migratory ungulates. One hypothesis is that the Paleo-Agulhas Plain supported a migration ecosystem of large grazers driven by summer rainfall, producing palatable forage during summer in the east, and winter rainfall, producing palatable forage during winter in the west. Alternatively, ungulates may have been moving from the coastal plain in the south to the interior north of the Cape Fold Mountains, as observed for elephants in historic times. In this study, we assess ungulate movement patterns with inter-and intra-tooth enamel samples for strontium isotopes in fossil fauna from Pinnacle Point sites PP13B and PP30. To accomplish our goals we created a bioavailable 87 Sr/ 86 Sr isoscape for the region by collecting plants at 171 sampling sites and developing a geospatial model. The strontium isotope results indicate that ungulates spent most of their time on the Paleo-Agulhas Plain and avoided dissected plain, foothill, and mountain habitats located more than about 15 km north of the modern coastline. The results clearly exclude a north-south (coastal-interior) movement or migration pattern, and cannot falsify the east-west movements hypothesized in the south coast migration ecosystem hypothesis.
2018
Charles W. Helm*, Richard T. McCrea, Martin G. Lockley, Hayley C. Cawthra, Guy H.H. Thesen & Joshua M. Mwankunda Peace Region Palaeontology Research Centre, Box 1540, Tumbler Ridge, British Columbia, V0C 2W0, Canada African Centre for Coastal Palaeoscience, P.O. Box 77000, Nelson Mandela University, Port Elizabeth, 6031 South Africa Dinosaur Trackers Research Group, Campus Box 172, University of Colorado Denver, P.O. Box 173364, Denver, 80217-3364, U.S.A. Marine Geoscience Unit, Council for Geoscience, P.O. Box 572, Bellville, 7535 South Africa Ngorongoro Conservation Area Authority, P.O. Box 1, Ngorongoro Crater, Arusha, Tanzania
2018
Klasies River, a significant Middle Stone Age (MSA) site, preserves remains of anatomically modern humans and a 21 m sequence of human habitation that shows use of sophisticated lithic technology and systematic exploitation of marine and terrestrial resources. In this paper micromammals recovered from the lower MSA sequence (MSA I and MSA II) at Klasies River Main site have been analysed to provide proxy data for palaeoenvironmental reconstruction. Small mammals recovered from 183 separate layers ensure a detailed record of local climate and vegetation during Marine Isotope Stage (MIS) 5. Taphonomic analyses indicate that avian predators accumulated the micromammals. Analysis of post-depositional processes has provided information on intra-site variability and utilisation. The palaeoenvironmental reconstruction shows changes in rainfall seasonality within MIS 5. There was transient movement towards more aseasonal rainfall and significant alterations in the vegetation composition from MIS 5e to MIS 5a. Our study adds new insights to palaeoenvironmental conditions on the Cape coast during MIS 5.