Integrative geochronology calibrates the Middle and Late Stone Ages of Ethiopia’s Afar Rift

The Halibee member of the Upper Dawaitoli Formation of Ethiopia’s Middle Awash study area features a wealth of Middle and Later Stone Age (MSA and LSA) paleoanthropological resources in a succession of Pleistocene sediments. We introduce these artifacts and fossils, and determine their chronostratigraphic placement via a combination of established radioisotopic methods and a recently developed dating method applied to ostrich eggshell (OES). We apply the recently developed 230Th/U burial dating of OES to bridge the temporal gap between radiocarbon (14C) and 40Ar/39Ar ages for the MSA and provide 14C ages to constrain the younger LSA archaeology and fauna to ∼24 to 21.4 ka. Paired 14C and 230Th/U burial ages of OES agree at ∼31 ka for an older LSA locality, validating the newer method, and in turn supporting its application to stratigraphically underlying MSA occurrences previously constrained only by a maximum 40Ar/39Ar age. Associated fauna, flora, and Homo sapiens fossils are thereby now fixed between 106 ± 20 ka and 96.4 ± 1.6 ka (all errors 2σ). Additional 40Ar/39 results on an underlying tuff refine its age to 158.1 ± 11.0 ka, providing a more precise minimum age for MSA lithic artifacts, fauna, and H. sapiens fossils recovered ∼9 m below it. These results demonstrate how chronological control can be obtained in tectonically active and stratigraphically complex settings to precisely calibrate crucial evidence of technological, environmental, and evolutionary changes during the African Middle and Late Pleistocene.

Zooarchaeology and Taphonomic Aspects of Later Stone Age Faunal Assemblage from Loiyangalani Site in Serengeti National Park, Tanzania

The paper presents detailed zooarchaeological and taphonomic results on the Later Stone Age (LSA) faunal assemblage. The contributions of various taphonomic agents in the formation of the assemblage are accentuated. The assemblage is well-preserved and the majority of specimens are not highly weathered. Fluvial disturbance did not play a significant role and can be ruled out as a significant taphonomic agent in the formation. Results indicate that LSA humans exploited high-quality nutritional resources mainly of the large-sized animals and aquatic resources as extra sources of meat and fat. The assemblage preserves stone tools butchery marks (cut marks and percussion marks) and carnivore marks (tooth marks) albeit few. Overall, the faunal assemblage exhibits high anthropogenic inputs and marginal carnivore involvement. Keywords: Zooarchaeology; Taphonomy; Later Stone Age; Serengeti National Park; Loiyangalani; Tanzania

Phytolith Palaeoenvironments at Mumba Rock Shelter

The rock shelter site of Mumba in northern Tanzania plays a pivotal role in the overall study of the late Pleistocene archaeology of East Africa with an emphasis on the Middle to Later Stone Age transition. We used phytolith analysis to reconstruct general plant habitat physiognomy around the site from the onset of the late Pleistocene to recent times, tallying 4246 individual phytoliths from 19 archaeological samples. Statistical analysis explored phytolith richness, diversity, dominance, and evenness, along with principal components to compare phytolith distributions over the site’s sequence with known plant habitats today. Generally, the phytolith record of Mumba signifies paleoenvironments with analogs in the Somalia – Masai bushland and grassland, as well as Zambezian woodlands.

Making the Invisible Stratigraphy Visible: A Grid-Based, Multi-Proxy Geoarchaeological Study of Umhlatuzana Rockshelter, South Africa

Umhlatuzana rockshelter is an archaeological site with an occupational record covering the Middle Stone Age, Later Stone Age, and Iron Age. The presence of both Middle and Later Stone Age assemblages makes Umhlatuzana the ideal location for the study of the MSA–LSA transition (20–40 ka) in southern Africa. This transitional period is characterized by important modifications in stone tool technology, from prepared core technology to a toolkit based on microlith production. These changes are argued to have occurred in response to changes in climate and environment leading up to the Last Glacial Maximum. The deposits bearing the transitional assemblages at Umhlatuzana rockshelter appear homogeneous with no visible stratigraphic boundaries. This study integrates geoarchaeological techniques in order to explore fine-resolution geochemical differentiations of the sediments that are macroscopically invisible, and that will provide insight into (post-)depositional processes over time. Samples were systematically retrieved from the western profile of the site following a grid-based sampling strategy and analyzed for pH, elemental composition (XRF), and Magnetic Susceptibility. Additionally, the results were integrated with preliminary micromorphological observations. Our study reveals a steady, gradual change in the geochemistry of the deposits throughout the Pleistocene, related to a combination of environmental change and occupation intensity. We suggest that the part of the sequence reported to bear Middle to Later Stone Age transitional industries is characterized by wetter environmental conditions compared to the underlying deposits. Additionally, we support results from previous studies that excluded large scale post-depositional movement of the sedimentary sequence. Our study offers a successful multi-proxy approach to systematically sample and study archaeological deposits at the macro and micro scale, integrating a variety of geoarchaeological techniques. The approach provides insight into the depositional and post-depositional history of the site, and allows for questions of stratigraphic integrity, anthropogenic input, preservation, and environmental change to be addressed.

An Archaeological Investigation of Laloi East Molluscs Site at Kpone, Ghana

This article is a report of an archaeological investigation of the Laloi East Molluscs Site at Kpone, Greater Accra Region, Ghana. Although radiometric dates for this shell midden are currently unavailable, we believe that Laloi East dates to the Later Stone Age. If so, this site would be one of only two LSA sites in Ghana found and excavated along the coast rather than in the forested interior. This article examines shellfish exploitation and other major subsistence strategies of the population that settled the site in the past. The principal cultural materials recovered from the excavations comprised large quantities of molluscs’ remains belonging to a variety of species, other faunal remains, pottery, palm kernel nuts, charcoal, stone slabs, and lithic tools. The combined evidence indicates that molluscs’ exploitation was the principal subsistence strategy of the settlers, undertaken alongside hunting, trapping, herding and the gathering of edible botanical resources such as palm fruits.

Testing the Integrity of the Middle and Later Stone Age Cultural Taxonomic Division in Eastern Africa

The long-standing debate concerning the integrity of the cultural taxonomies employed by archaeologists has recently been revived by renewed theoretical attention and the application of new methodological tools. The analyses presented here test the integrity of the cultural taxonomic division between Middle and Later Stone Age assemblages in eastern Africa using an extensive dataset of archaeological assemblages. Application of a penalized logistic regression procedure embedded within a permutation test allows for evaluation of the existing Middle and Later Stone Age division against numerous alternative divisions of the data. Results suggest that the existing division is valid based on any routinely employed statistical criterion, but that is not the single best division of the data. These results invite questions about what archaeologists seek to achieve via cultural taxonomy and about the analytical methods that should be employed when attempting revise existing nomenclature.

Ostrich Eggshell Beads in Later Stone Age Contexts

Ostrich eggshell (OES) beads are a common feature of Later Stone Age (LSA) archaeology throughout eastern and southern Africa and have the potential to inform on site use, cultural diversity, social networks, and site formation. However, too often OES bead assemblages have not been recorded or studied in the necessary detail to make meaningful contributions to these important questions. In this respect, and to aid future research focusing on the African LSA, OES and OES beads must be discussed in detail, beginning with a background to ostriches and their eggs and commenting on why OES is an important raw material. Then, one should consider OES beads in detail, specifically, the manufacturing process, the social context in which they were made, and how they may have been used in the past. Subsequently, the focus should be on how OES bead assemblages are analyzed, as well as archaeometric approaches to studying OES bead residues and OES bead provenance. The potential insights gained from these diverse and multidisciplinary analytical approaches, especially when combined, are then highlighted through discussing trends in OES bead research from African LSA contexts. These trends include the contribution of OES beads to understanding the complex transition from hunter-gatherers to herders, the identification of different cultural groups in the past, and identifying the presence and extent of past social networks. The final focus should be on future research directions that will benefit OES bead research, specifically more detailed approaches to understanding OES bead diversity and the expansion of experimentally derived taphonomic frameworks for identifying past human and nonhuman behaviors in OES bead assemblages. Future research should build on the growing body of detailed OES bead analyses, as they provide unique insight and a strong complement to traditional archaeological approaches to understanding past peoples, groups, and cultures during the African LSA.