S.A.N.D.S. - Surface Archaeology on the Namib Desert Surface. 

Abstract

The hyper-arid Namib Sand Sea (NSS) represents a significant challenge to human occupation, yet, despite these challenges, Early Stone Age (ESA) and Middle Stone Age (MSA) tools are found across this landscape. Whilst surface scatters are hindered by a lack of clear stratigraphy, they provide a spatially integrated record of the structuring of landscape use through time and relationships to sources of raw material and water. Omitting such sites leads to bias in our interpretations of early hominin distribution. We are investigating how and why early hominins were moving into the northern NSS, starting with two interdune pan sites: Namib IV (Leader et al., 2023) and Narabeb. Here we set out the context of these archaeological sites, the stratigraphies observed and our emerging luminescence chronologies for the sedimentary sequences.   To establish the palaeoenvironmental context of the lithics (both ESA and MSA) and fossil fauna at Namib IV we dug a series of test pits to explore the sedimentological record. The Namib IV surface has a complex meso-topography with a spatially-patchy, resistant calcareous surface unit, and our test pits reveal a similarly complex sedimentary record across space. This includes the preserved remnant of an aeolian slip face, and elsewhere a number of horizontally bedded units beneath surface calcareous layers. 13 samples from Namib IV were selected for luminescence dating, using pIRIRSL feldspar methods, anticipating ages close to quartz saturation (e.g. Stone et al. (2010) in this region). Narabeb contains predominantly MSA lithics. North (~2 km) of the artifact collection area is a prominent ‘ledge’ of interbedded muds and sands, previously dated using quartz OSL (Stone et al., 2010). We dug two small geotrenches associated with surface calcareous exposures, taking samples for pIRIRSL dating along with two sampling points in the lower unconsolidated dune flank. We also date a sample from the Stone et al. (2010) sequence using pIRIRSL (K fieldspar) to revise the saturated quartz luminescence age estimate.   References Leader, G.M., Bynoe, R., Marks, T., Stone, A., Efraim, K., Stratford, D., Marais, E. (2023) Revisiting the Acheulean at Namib IV in the Namib Desert, Namibia. Journal of Field Archaeology 48(5), 380-394. Stone, A., Thomas, D.S.G., Viles, H.A. (2010) Late Quaternary palaeohydrological changes in the northern Namib Sand Sea: new chronologies using OSL dating of interdigitated aeolian and water-lain interdune deposits. Palaeogeography, Palaeoclimatology, Palaeoecology 288 (1-4), 35-53.