Ōdai Yamamoto I

Ōdai Yamamoto I
Name	Ōdai Yamamoto I
Native name	大平山本遺跡I
Location	Aomori Prefecture, Japan
Epoch	Jōmon period
Discovered	1980s

Ōdai Yamamoto I

Ōdai Yamamoto I is an archaeological site in Aomori Prefecture associated with early Jōmon hunter-gatherer communities and notable for some of the earliest pottery in East Asia. The site has been central to debates involving Paleolithic archaeology, radiocarbon calibration, and prehistoric migration models connecting the Japanese archipelago, Korea, Siberia, and Sakhalin. Findings from the site inform discussions in comparative studies alongside sites such as Sannai-Maruyama, Nayoro, Otaian culture, and Jōmon pottery sequences.

Overview and Discovery

The site was identified during regional surveys by teams from local cultural affairs bureaus and university projects linked to Aomori Prefectural Museum and Tohoku University archaeological units. Initial fieldwork involved stratigraphic trenching adjacent to peat deposits and mollusk-bearing layers previously mapped by researchers from Hokkaido University, University of Tokyo, and the National Museum of Japanese History. Excavations recovered ceramic sherds, lithics, and carbonaceous deposits that prompted collaboration with specialists from the Radiocarbon Laboratory at the University of Arizona, analysts associated with the International Commission on Radiocarbon Dating, and curatorial staff from the Tokyo National Museum.

Dating and Chronology

Chronometric analyses have used accelerator mass spectrometry (AMS) radiocarbon dates on charred residues, charcoal, and marine shell associated with in situ pottery, producing early Holocene chronologies comparable to dates from Sakhalin and sites in Primorsky Krai. Bayesian modeling by teams linked to Oxford Radiocarbon Accelerator Unit and Japanese laboratories reconciled marine reservoir effects debated in publications by researchers at Leiden University and the University of Tsukuba. The resulting framework situates Ōdai Yamamoto I at the inception of the Jōmon sequence contemporaneous with early pottery horizons in Jeulmun pottery culture and the earliest Neolithic assemblages in Northeast China.

Material Culture and Artifacts

Recovered assemblages include incised and cord-impressed pottery, the earliest confirmed fibre-tempered or paddle-decorated sherds in northern Honshū, ground stone tools, polished slate implements, and faunal remains of salmonid and gadid species. Comparative typological studies reference parallels with artifacts from Sannai-Maruyama, Kamegaoka, Itazuke, and Paleolithic blade technologies seen at Kotoku sites. Organic residues have been analyzed by archaeobotanists from Kochi University and isotope specialists at Hiroshima University to infer subsistence involving fishing, shellfish gathering, and nut processing similar to patterns reported at Oshoro, Torihama, and Kasori Shell Mound.

Site Context and Archaeological Excavations

Excavation phases coordinated by municipal authorities, university research teams, and regional heritage agencies employed stratigraphic excavation, flotation, and micromorphology informed by protocols from the Japanese Archaeological Association and conservation guidance from the Agency for Cultural Affairs (Japan). Field seasons documented hearth features, posthole patterns, and midden layers analogous to settlement layouts at Sannai-Maruyama and seasonal camps documented in ethnographic comparisons with cultures of Siberia. Publication of interim reports in journals affiliated with The Society for East Asian Archaeology and monographs from Yale University Press and University of Tokyo Press broadened multidisciplinary engagement.

Significance for Jōmon Prehistory

Ōdai Yamamoto I has been pivotal in redefining the onset of Jōmon pottery-making and in modeling population interactions across the Sea of Japan and Tsugaru Strait. The site informs debates involving demic diffusion, cultural transmission, and technological innovation posed in comparative frameworks alongside Ainu studies, genetic research from teams at Kyoto University and National Museum of Nature and Science, and paleoenvironmental reconstructions published by researchers at Paleontological Society of Japan. Its data contribute to regional syntheses connecting early Holocene climatic shifts recorded in cores from Lake Suigetsu and sea-level histories in the Seto Inland Sea.

Conservation and Display

Artifacts from Ōdai Yamamoto I are conserved under protocols developed by conservators at the Tokyo National Museum, the Aomori Prefectural Museum, and the National Research Institute for Cultural Properties, Tokyo. Selected finds have been exhibited in special exhibitions at institutions including the National Museum of Nature and Science, Sendai City Museum, and international venues collaborating with the British Museum and the Smithsonian Institution. Ongoing conservation employs non-invasive imaging, stable isotope sampling, and digital curation coordinated with regional heritage managers and international research consortia.

Category:Jōmon period sites Category:Archaeological sites in Aomori Prefecture