Magnetic Gradient Survey of the Marpole Period Dionisio Point (DgRv-003) Plankhouse Village,Northwest Coast of North America

Architectural reconstructions of plankhouses are central to the study of household and community organization on the Northwest Coast of North America. However, the sample of substantially excavated houses is constrained by their size, stratigraphic complexity, and typically limited surface expression. We present the results of a magnetic gradiometry survey of the Dionisio Point site (DgRv-003) village, occupied ca. a.d. 500–700 on the coast of British Columbia, Canada. Survey of four house platforms reveals patterning of magnetic anomalies consistent with the structure of shed-roof houses, a design recorded ethnographically and identified archaeologically at the site. These results suggest a consistent pattern of spatial and, potentially, social organization of the households. The similarity of patterns suggests that magnetometry may be useful for guiding plankhouse excavations elsewhere on the Northwest Coast, providing a means for expanding our knowledge of houses without relying solely on traditional excavation methods.     

Understanding the built environment at the Seneca Iroquois White Springs Site using large-scale,multi-instrument archaeogeophysical surveys

A landscape-scale conception of the circa 1688–1715 CE Seneca occupation at the White Springs Site (NYSM 1952; RMSC Plp-018), located in Geneva, NY, is important for understanding their built environment during a period of residential upheaval. This paper reports on approximately five hectares of high-resolution, multi-instrument archaeogeophysical surveys. These surveys allowed engagement with layered, temporal contexts and the gathering of otherwise inaccessible information. In combination with excavation, surface survey, and historic research, archaeogeophysical techniques provided expanded access to the site, a settlement size estimate of 1.42–2.75 ha, and tentative evidence for a palisade at the White Springs Site. The interplay between archaeogeophysics and other techniques was critical to this undertaking.     

Mapping Qijiaping: New Work on the Type-Site of the Qijia Culture (2300–1500 B.C.) in Gansu Province,China

Recent work at the Qijia Culture type-site of Qijiaping in the Tao River valley of Gansu Province, China, has shed light on the complex nature of this early Bronze Age site. Situated at the intersection between the mixed pastoralists of eastern central Asia and the agriculturalists of China’s northern Central Plain, Qijia peoples absorbed, evolved, and transmitted products and technologies that shaped cultural developments in both directions. The Tao River Archaeological Project (TRAP) used a combination of surface survey, geophysics, digital mapping, and targeted excavation to expand our understanding of the multicomponent nature of Qijiaping. This included identifying potential habitation, mortuary, and production locales; examining site-wide ceramic use; mapping anomalies through geophysics; and further exploring these through targeted excavations. The results have expanded our knowledge of the site structure of Qijiaping and its place in the wider Qijia interaction sphere, while also confirming the usefulness of this methodology.     

The Search for the 1871 Whaling Fleet of the Western Arctic: writing the final chapter

During 2015, the NOAA Office of National Marine Sanctuaries led a systematic seabed mapping survey along the Arctic coast of Alaska in search of whaling ships abandoned in 1871. The purpose of the expedition was to determine if wreckage from these abandoned ships was still present in the survey area, and, if so, to assess and document its location, status and condition. The project mapped approximately 50 km² of seabed using sidescan sonar and magnetometry and identified six sites that contained wreckage from at least two whaling ships. Magnetometry data also suggested that additional wreckage may be buried in the seabed.     

Archaeological geophysics of a Bronze Age agricultural landscape: the AROURA Project,central mainland Greece

Between 2010 and 2012, the AROURA project conducted magnetometric prospection in the ancient polder around the Late Bronze Age (ca. 1300–1190 b.c.) fortress of Glas, mainland Greece. As had been hypothesized, the anomalies detected were consistent with a system of agricultural fields. This system appears to have been irrigated and drained through previously identified hydraulic mechanisms in and around the polder. Comparison of soil profiles of anomalies with those of background areas, including their magnetic susceptibilities, corroborated magnetometric data. Anomalies were traced from sampled to unsampled areas through corresponding reclassified satellite bandwidths. Constituent sediments of features discovered were dated to the Late Bronze Age through AMS radiocarbon and OSL analyses. The results validated the use of extensive geophysics to detect and investigate ancient agricultural landscapes.     

水下被掩埋沉船的地球物理调查

本文在简要介绍可用于水域考古的物探方法及各自的特点外,结合在长江某河道使用磁法勘察技术发现河床中被掩埋的7条金属沉船的实例,讨论寻找水下磁性物体的方法技术,以及在考古工作中使用高精度磁测能发现的最小磁性体场源及相应的最大有效探测埋深。