Geoarchaeological Analysis Research Articles

Chronology and Stratigraphy at Dust Cave, Alabama

Dust Cave (1Lu496) is a habitation site in a karstic vestibule in the middle Tennessee River Valley of Northern Alabama. The cave, periodically occupied over 7,000 years, contains well-preserved bone and botanical materials and exhibits microstratigraphy and intact occupation surfaces. The chronostratigraphic framework for Dust Cave is based on 43 14C dates, temporally diagnostic artifacts, and detailed geoarchaeological analysis. In a broad sense, five cultural components are defined and designated: Quad/Beaver Lake/Dalton (10,650–9200 cal B.C.), Early Side-Notched (10,000–9000 cal B.C.), Kirk Stemmed (8200–5800 cal B.C.), Eva/Morrow Mountain (6400 to 4000 cal B.C.), and Benton (4500–3600 cal B.C.). Microstratigraphic and artifact analyses indicate that the primary differences in the deposits over time relate to intensity of activity and spatial organization with regard to changing conditions in the cave, not to the types of activities. Geomorphic transformations influenced the timing of occupation at Dust Cave, especially the initial occupation. The chronostratigraphy provides a framework for assessing the stratigraphic separation of Dalton and Early Side-Notched materials, the shift in technology from blades to bifacial tools, and the context of detailed flora and fauna evidence. These remains provide unique insights into forager adaptations in the Midsouth from the end of the Pleistocene through the first half of the Holocene.

Late Lapita occupation and its ceramic assemblage at the Sigatoka Sand Dune site, Fiji, and their place in Oceanic prehistory

AbstractThe Sigatoka Sand Dune site on the island of Viti Levu, Fiji, has been continuously eroding over the past half century. Large‐scale excavations here in the mid‐1960s documented a Late Lapita ceramic horizon, one significantly including many restorable or diagnostically complete vessels. A 1998 discovery of an intact segment of this deposit led to renewed excavation and the recovery of additional vessels. The results of this excavation are presented and used to redress long‐standing problems associated with the occupation and interpretation of the ceramic assemblage. Based on radiocarbon dates and geoarchaeological analysis, it is known that the ceramics originally were deposited and rapidly buried on a back beach sand flat over a very brief period of time ca. 2500 BP (ca. 2600 cal. BP). The distribution of ceramics, the relative absence of habitation features, non‐ceramic artifacts and fauna, and shoreline characteristics suggest the locale was employed as a canoe‐landing site. The temporal discreteness, and the completeness of ceramic vessels have made the collection a critical assemblage for comparative analyses in Oceanic prehistory. With only limited decoration applied to the vessels, the assemblage has been interpreted as a devolutionary stage, one intermediate between the complex and highly structured decorated vessels of the initial Lapita colonists and a sequent Plainware phase where decoration has all but disappeared. Rather than a devolutionary stage, the Sigatoka pottery represents a viable industry with functional if not social importance in late Lapita society.

Archaeological and Palaeo-environmental Investigations of the Upper Allen Valley, Cranborne Chase, Dorset (1998–2000): a New Model of Earlier Holocene Landscape Development

A combination of on- and off-site palaeo-environmental and archaeological investigations of the upper Allen valley of Dorset conducted in 1998–2000 has begun to reveal a different model of landscape development than those previously put forward. A combination of off-site geoarchaeological and aerial photographic survey and palynological analyses of two relict palaeochannel systems, and sample investigations of four Bronze Age round barrows and a Neolithic enclosure, have been combined with inter-regional summaries of the archaeological and molluscan records to re-examine the prehistoric landscape dynamics in the study area. Preliminary results suggest that woodland development in the earlier Holocene appears to have been more patchy than the presumed model of full climax deciduous woodland. With open areas still present in the Mesolithic, the area witnessed its first exploitation of the chalk downs, thus slowing and altering soil development of the downlands. Consequently, many areas perhaps never developed thick, well structured, clay-enriched soils (or argillic brown earths), but rather thin brown earths. By the later Neolithic these under-developed soils had become thin rendzinas, largely as a consequence of human exploitation. The presence of thinner and less well-developed soils over large areas of downland removes the necessity for envisaging extensive soil erosion and thick aggraded deposits in the valley bottom in later prehistory. The investigations have suggested that, if there were major changes in vegetation and soil complexes, these had already occurred by the Neolithic rather than in the Bronze Age as suggested by previous researchers, and the area has remained relatively stable since.

Geoarchaeology of the Milfield Basin, northern England; towards an integrated archaeological prospection, research and management framework

AbstractThis paper presents the results of geoarchaeological investigations undertaken on the valley floor of the Milfield Basin in Northumberland, northern England. The area has a regionally and nationally important archaeological record, including a series of major neolithic and Anglian settlements, but has hitherto lacked archaeological assessment and management guidelines appropriate to the wide range of late‐glacial and post‐glacial environmental settings in the basin. This project has used geomorphological techniques to delimit and classify a total of nine valley floor landform elements in terms of their geomorphology and their known and potential archaeological and palaeoenvironmental associations.Terraced glaciodeltaic and glaciofluvial sand and gravel landforms comprise the oldest landform elements described here and have formed the primary regional focus for prehistoric and early historic settlement and associated subsistence and ritual activity. These landforms have experienced little post‐glacial geomorphological activity, but their multiperiod archaeological landscapes lie beneath a shallow soil cover and are vulnerable to land‐use activities that disturb terrace soils and underlying sediments. A second group of landform elements are of Holocene age and include localized surface peats, alluvial fans, colluvial deposits and extensive deposits of terraced alluvium. Archaeological landscapes in these environments may lie buried intact and unrecorded beneath protective covers of sediment although locally they may have been subject to erosion and reworking by fluvial and slope processes. Holocene alluviation may account, at least in part, for the paucity of recorded archaeology in these parts of the basin. However, peat and organic‐rich sedimentary sequences identified here (including four 14C dated peat sequences) offer an opportunity to elucidate the environmental context and land‐use histories of local prehistoric and early historic communities in the basin, and hence also should be regarded as an archaeological resource.Discussion of landform elements and their archaeological associations is followed by a brief outline of evaluation criteria developed with the aim of ensuring effective long‐term management of archaeological and palaeoenvironmental resources. It is concluded that geoarchaeological analysis of landform elements may be considered central to development of frameworks intended to underpin future programmes of archaeological research and the development of cultural resource management and evaluation strategies. Copyright © 2002 John Wiley & Sons, Ltd.

Destruction of Herod the Great's harbor at Caesarea Maritima, Israel—Geoarchaeological evidence

Geoarchaeological analysis of ancient harbor deposits has answered questions regarding the timing and extent of the destruction of the harbor at Caesarea Maritima built by Herod the Great on Israel's Mediterranean coast. By using stratigraphic, micropaleontological (foraminifera), and geochemical (Sr isotopes) analyses of the ancient harbor deposits we can establish a late first to early second century A.D. date for the destruction of the harbor. This destruction occurred earlier, was more rapid and widespread than previously proposed, and was probably caused by seismic activity. The new excavations also indicate that during the fourth to early sixth centuries A.D., geomorphological processes and siltation within the inner harbor allowed this area to be used in a limited capacity as a harbor.

Micromorphological Analysis of Sediments from Meadowcroft Rockshelter, Pennsylvania: Implications for Radiocarbon Dating

Meadowcroft Rockshelter (36WH297), in Pennsylvannia, is an important site in North American prehistory because of its long continuous sequence of occupation and its controversial pre-Clovis dates. While a geoarchaeological analysis of the site has been conducted over twelve seasons of excavation between 1973 and 1999, questions have remained concerning the potential for groundwater contamination of the lowest levels that could have contributed to falsely early radiocarbon dates. The present study employs a micromorphological analysis of sediments to clarify the depositional and post-depositional history of the site. The results largely confirm the original work of the excavators, pointing to deposition by attrition, roof fall, and sheet wash, and reveal no evidence of groundwater contamination of the early levels.

Geoarchaeological analysis of an acheulean site at Kalambo Falls, Zambia

AbstractAcheulean sites are commonly recovered from sandy channel contexts, particularly in Africa. These sites frequently contain impressive concentrations of artifacts dominated by typical Acheulean large bifacial artifacts (‘handaxes,’ etc.). Possible influences of fluvial sedimentary processes in Acheulean site formation are explored through consideration of sedimentary context and detailed analysis of relevant artifact assemblage characteristics in part of a major Acheulean ‘Floor’ at Kalambo Falls, Zambia. The Kalambo Falls patterns are analyzed here with regard to influences of behavioral and natural processes in their formation, and are compared to those observed in Acheulean horizons at Montagu Cave, South Africa. Spatial concentration of bifaces and paucity of debitage at many Acheulean sites may be due largely to fluvial disturbance and winnowing, although a hominid preoccupation with large bifacial tools may be a bona fide behavior pattern at some sites. Better control over sedimentary context is necessary to elucidate the range of behaviorally‐produced patterns at Acheulean sites.

Variability of laboratory procedures and results in geoarchaeology

AbstractMany laboratory techniques are available to geoarchaeologists to determine physical or chemical attributes of sediment or soil samples, and several techniques are often available for analysis of a single attribute. This is illustrated by analyzing duplicate sediment and soil samples from the British Camp Site (Washington) and Lubbock Lake Site (Texas) using two methods for organic carbon content, two methods for organic matter content, and three methods for calcium carbonate content, and several pretreatment procedures for particle‐size analysis. These comparisons illustrate that different methods of analysis for the same property of duplicate samples can yield different results. Therefore, when making comparisons with data from other sites or other investigators, the types of laboratory methods used in geoarchaeological analyses are important considerations. Choice of a particular technique will depend on a variety of factors, often conflicting, including the archaeological and geoarchaeological questions being asked, the physical and chemical nature of the samples, and the accuracy, efficiency, and cost of the method.

Rise and Fall of Axum, Ethiopia: A Geo-Archaeological Interpretation

Civilizations represent human ecosystems amenable to systematic geo-archaeological analysis. The civilization of Axum, spanning the first millennium A.D., had its settlement core on the now-denuded, subhumid plateau of northern Ethiopia. Axum, a new city, began A.D. 100 as a ceremonial center, growing to over 10,000 people, as a prosperous emporium for international trade. Intensified land use led to mass movements in slope soils before A.D. 300, but a range of clayey stream deposits also implicates strong periodic floods and seasonally abundant moisture. The paleoclimatic ensemble suggests that stronger and more reliable spring rains allowed two crops yearly without irrigation, compared to only one with modern summer rains. Trade declined after 600 and Axum was essentially landlocked by 715. Intense land pressure and more erratic rainfall favored soil destruction and ecological degradation during the seventh and eighth centuries. Largely abandoned by 800 and pillaged by border tribes. Axum retained only symbolic significance as power shifted to the more fertile lands of humid central Ethiopia. Axum shows how the spatial and temporal variability of resources, and the interactions between a society and its resource base, can be fundamental in the analysis of historical process.