David K. Wright

The Development and Collapse of Precolonial Ethnic Mosaics in Tsavo, Kenya

Archaeologists and historians have long believed that little interaction existed between Iron Age cities of the Kenya Coast and their rural hinterlands. Ongoing archaeological and anthropological research in Tsavo, Southeast Kenya, shows that Tsavo has been continuously inhabited at least since the early Holocene. Tsavo peoples made a living by foraging, herding, farming, and producing pottery and iron, and in the Iron Age were linked to global markets via coastal traders. They were at one point important suppliers of ivory destined for Southwest and South Asia. Our excavations document forager and agropastoralist habitation sites, iron smelting and iron working sites, fortified rockshelters, and mortuary sites. We discuss the relationship between fortified rockshelters, in particular, and slave trade.

Tethered mobility and riparian resource exploitation among Neolithic hunters and herders in the Galana River basin, Kenyan coastal lowlands

Abstract Human activity along the Galana River inside Tsavo National Park, Kenya extends from 6000 years BP until at least 1300 years BP. This time period in East Africa predates and includes the Pastoral Neolithic – geographically and temporally linked early cattle-herding cultures comprised of autonomous communities with loose cultural connections to one another. Data from some sites located in the Great Rift Valley, Lake Victoria Basin and Central Kenyan Highlands indicate that after 3000 years BP, residential mobility patterns increased and pastoralists adopted a strong dependence on maintaining and culling herds of domesticated animals. This pattern is not borne out in Tsavo, where artefact analyses indicate that people had restricted mobility and relied primarily on exploitation of an endoaquatic resource base. This study hypothesises that subdecadal periodicity in El Niño/Southern Oscillation index (ENSO) along with a general trend toward aridification of East African landscapes provided the environmental backdrop for a subsistence regime focused primarily within riparian environments of the Coastal Lowlands region.

Humans as Agents in the Termination of the African Humid Period

There is great uncertainty over the timing and magnitude of the termination of the African Humid Period (AHP). Spanning from the early to middle Holocene, the AHP was a period of enhanced moisture over most of northern and eastern Africa. However, beginning 8000 years ago the moisture balance shifted due to changing orbital precession and vegetation feedbacks. Some proxy records indicate a rapid transition from wet to dry conditions, while others indicate a more gradual changeover. Heretofore, humans have been viewed as passive agents in the termination of the AHP, responding to changing climatic conditions by adopting animal husbandry and spreading an agricultural lifestyle across the African continent. This paper explores scenarios whereby humans could be viewed as active agents in landscape denudation. During the period when agriculture was adopted in northern Africa, the regions where it was occurring were at the precipice of ecological regime shifts. Pastoralism, in particular, is argued to enhance devegetation and regime shifts in unbalanced ecosystems. Threshold crossing events were documented in the historical records of New Zealand and western North America due to the introduction of livestock. In looking at temporally correlated archaeological and paleoenvironmental records of northern Africa, similar landscape dynamics from the historical precedents are observed: reduction in net primary productivity, homogenization of the flora, transformation of the landscape into a shrub-dominated biozone and increasing xerophylic vegetation overall. Although human agents are not seen as the only forces inducing regime change during the termination of the AHP, their potential role in inducing large-scale landscape change must be properly contextualized against other global occurrences of neolithization.

Analysis of Feature Intervisibility and Cumulative Visibility Using GIS, Bayesian and Spatial Statistics: A Study from the Mandara Mountains, Northern Cameroon

The locations of diy-geδ-bay (DGB) sites in the Mandara Mountains, northern Cameroon are hypothesized to occur as a function of their ability to see and be seen from points on the surrounding landscape. A series of geostatistical, two-way and Bayesian logistic regression analyses were performed to test two hypotheses related to the intervisibility of the sites to one another and their visual prominence on the landscape. We determine that the intervisibility of the sites to one another is highly statistically significant when compared to 10 stratified-random permutations of DGB sites. Bayesian logistic regression additionally demonstrates that the visibility of the sites to points on the surrounding landscape is statistically significant. The location of sites appears to have also been selected on the basis of lower slope than random permutations of sites. Using statistical measures, many of which are not commonly employed in archaeological research, to evaluate aspects of visibility on the landscape, we conclude that the placement of DGB sites improved their conspicuousness for enhanced ritual, social cooperation and/or competition purposes.

AMS Dates from Two Archaeological Sites of Korea: Blind Tests

In interpreting radiocarbon dating results, it is important that archaeologists distinguish uncertainties derived from random errors and those from systematic errors, because the two must be dealt with in different ways. One of the problems that archaeologists face in practice, however, is that when receiving dating results from laboratories, they are rarely able to critically assess whether differences between multiple 14 C dates of materials are caused by random or systematic errors. In this study, blind tests were carried out to check four possible sources of errors in dating results: repeatability of results generated under identical field and laboratory conditions, differences in results generated from the same sample given to the same laboratory submitted at different times, interlaboratory differences of results generated from the same sample, and differences in the results generated between inner and outer rings of wood. Five charred wood samples, collected from the Namgye settlement and Hongreyonbong fortress, South Korea, were divided into 80 subsamples and submitted to five internationally recognized 14 C laboratories on a blind basis twice within a 2-month interval. The results are generally in good statistical accordance and present acceptable errors at an archaeological scale. However, one laboratory showed a statistically significant variance in ages between batches for all samples and sites. Calculation of the Bayesian partial posterior predictive p value and chi-squared tests rejected the null hypothesis that the errors randomly occurred, although the source of the error is not specifically known. Our experiment suggests that it is necessary for users of 14 C dating to establish an organized strategy for dating sites before submitting samples to laboratories in order to avoid possible systematic errors.

Application of remote sensing technologies in detecting prehistoric canals of the Hohokam Period (a.d. 450–1450) in the Middle Gila River Valley, Arizona

This paper summarizes research on the potential of high-resolution imagery downloaded from Google Earth Pro to detect prehistoric canals from the Hohokam Period in the Middle Gila River Valley, Arizona. The potential of the imagery to identify obscured features was evaluated by means of ground truthing reconnaissance as well as a comparative analysis of the Google Earth imagery with the more traditionally employed CORONA and Landsat ETM+ imagery used in analogous studies. This research is presented as a method-based solution to utilize remote sensing in exploratory archaeological research projects facing budget constraints. The conclusion of the research was that Google Earth imagery provided the best spatial resolution for detecting obscured irrigation features compared to the other imagery used. The results of the investigation are summarized as a potential research model applicable in other dryland settings.

Stone Cairns and Material Culture of the Middle to Late Holocene, Lake Turkana

A recent archival research project in the National Museums of Kenya (NMK) identified artifacts and human remains associated with the 1980 excavation of stone cairns and habitation areas on the west side of Lake Turkana. The presence of stone grave cairns across eastern Africa is common, but their cultural origins and construction times are enigmatic. This article presents the results of the archival project and contextualizes both the artifacts found and the unpublished research notes within the framework of evolving settlement patterns in eastern Africa during the middle to late Holocene. Despite the presence of numerous decorative features on ceramics and the recovery of many complete lithic tools, the material culture is generally non-diagnostic within existing typo-technological categories. The research indicates that there was tremendous diversity in the material culture of the Turkana Basin during the late Holocene.

Change in Settlement Distribution and the Emergence of an Early State: A Spatial Analysis of Radiocarbon Dates from Southwestern Korea

Archaeologists have long examined how the emergence of core polities prompts changes in the settlement patterns of peripheral regions through various processes like warfare, patronage claims, control of ritual rites, and unequal balances of trade. According to historical records, there were 54 small Mahan polities in southwestern Korea, and one of these polities, Baekje, grew to become an ancient state by unifying other polities in the 4th century AD. It is assumed that subsequent changes in the settlement patterns of southwestern Korea were caused directly or indirectly by the expansion of Baekje, but the nature of this presumed influence is not fully explained due to difficulties in establishing chronologies and the limited application of spatial analyses. In this paper, radiocarbon ( 14 C) dates, kernel density estimates, and spatial autocorrelation analyses are used to compare Mahan settlement distributions before and after the rise of the Baekje kingdom. The results demonstrate that the spatial distribution of Mahan settlements changed over time, correlating with the emergence of Baekje statehood, but detailed aspects of the settlement patterns observed in each region were not uniform. Baekje applied various expansion strategies and exerted asymmetrical hegemony based on the conditions and responses of peripheral communities.

Iron Age Landscapes of the Benue River Valley, Cameroon

ABSTRACT The Iron Age settlements of northern Cameroon were dispersed across the landscape, taking advantage of different eco-climatic zones to exploit a variety of natural resources. Situated at the interface of the upper and lower terraces of the Benue River, mound sites in the area around Garoua have occupation histories spanning multiple centuries. The site of Langui-Tchéboua displays evidence for rapid accumulation of sediments approximately 700 years ago, which may have been a deliberate construction strategy that would have allowed the site’s inhabitants to exploit resources in both floodplain and dryland contexts. The combined use of multiple dating methods and micromorphology provide novel insights into both the mechanisms of anthropogenic landscape change and possible motivations governing those choices.