Kasori Shell Mound

Kasori Shell Mound
Name	Kasori Shell Mound
Map type	Japan
Location	Chiba Prefecture
Region	Kantō
Type	Shell midden
Epochs	Jōmon period
Public access	Yes (park, museum)

Kasori Shell Mound Kasori Shell Mound is a major Jōmon period archaeological site on the Bōsō Peninsula in Chiba Prefecture near Chiba (city), Japan. The site comprises extensive shell middens and settlement remains that illuminate connections among prehistoric communities associated with coastal resources, maritime networks, and ritual practice in the broader contexts of Jōmon period, Yayoi period, Kofun period, and later historical transformations. It is recognized for its scale, stratigraphy, and contributions to comparative studies involving sites such as Sannai-Maruyama Site, Toro (archaeological site), Ōmori Shell Mounds, and Kamo Site.

Overview

The Kasori complex sits within the coastal plain adjoining Tokyo Bay, facing the Pacific and within administrative bounds of Sakai (Chiba). Archaeological recognition of the site aligns with regional surveys that include work at Tategahana Shell Mound, Torihama Shell Mound, Katsusuka Site, and Ota City Kaizuka. The site has been compared with inland loci such as Kumayama Site and northern counterparts like Hakodate Jōmon Site, emphasizing interactions across the Tōhoku region and the Kantō region. Its importance has attracted attention from institutions including Tokyo University, University of Tokyo, Waseda University, Tohoku University, and museums such as the National Museum of Japanese History and the Chiba Prefectural Museum.

Archaeological Significance

Kasori provides stratified evidence that informs studies in settlement patterning discussed alongside Yoshinogari Site and Kujūkuri Beach research. Its middens contribute to models developed in comparative projects with Mitsumine Site, Asuka-dera, and coastal studies referencing the Seto Inland Sea and Sanriku Coast. Scholars from institutions like Kyoto University, Hokkaido University, Osaka University, and Nagoya University have used Kasori data in publications appearing in journals linked to the Japanese Archaeological Association and the Society for American Archaeology. The site intersects debates about Jōmon social complexity, as discussed in relation to Sannai-Maruyama Site and theoretical frameworks promoted by scholars at Princeton University, Cambridge University, Harvard University, and University College London.

Finds and Material Culture

Excavations revealed varied assemblages including shell species comparable to those from Awaji Island, Izu Islands, Ogasawara Islands, and trade parallels with Ryukyu Islands. Recovered artifacts include cord-marked pottery akin to styles from Kanto Jōmon pottery traditions, polished stone tools similar to materials from Kongō Mountains workshops, and bone implements paralleling finds at Futatsumori Shell Midden and Oarai Shell Midden. Organic remains include fish vertebrae matching taxa studied in relation to Sagami Bay fisheries, seabird bones comparable to collections from Okinawa Island and Hokkaidō, and plant macrofossils linking to domesticated taxa debates exemplified by work at Toro (archaeological site) and Yayoi rice agriculture discussions. Ritual objects and anthropomorphic pottery link interpretive threads with Jōmon Venus figurines and parallels from Meldgaard collection holdings.

Excavation History and Methodology

Systematic investigation began during surveys by prefectural archaeologists working with teams from Chiba University and Meiji University, incorporating techniques pioneered at Sannai-Maruyama Site and influenced by field methods from Smithsonian Institution collaborations. Excavation campaigns employed stratigraphic sampling, flotation processing protocols developed in concert with researchers from University of Cambridge and Australian National University, and radiocarbon dating coordinated with labs at University of Tokyo, Nagoya University, and Keio University. Interdisciplinary programs integrated zooarchaeology approaches used at Max Planck Institute for Evolutionary Anthropology and geochemical sourcing methodologies similar to work at Riken and Geological Survey of Japan. Conservation techniques paralleled practices at the Tokyo National Museum and field museums such as British Museum collaborations for fragile organics.

Environmental and Paleoecological Context

Paleoenvironmental reconstructions for Kasori utilize pollen sequences compared with cores from Lake Biwa, Lake Kasumigaura, and Shinobazu Pond, as well as sea-level curves relevant to Holocene transgression models studied across East Asian Monsoon research. Faunal and floral datasets inform seasonal exploitation patterns analogous to those inferred at Torihama Shell Mound and Sannai-Maruyama Site, while isotopic analyses tie into broader syntheses involving Stable isotope analysis laboratories at Tohoku University and Kyoto University. The site's position on the Bōsō Peninsula links it to migratory routes considered in studies of Kuroshio Current influence, comparative marine ecology with Sagami Bay and Izu-Oshima, and climate narratives advanced in collaborations with National Institute of Polar Research and Japan Meteorological Agency.

Conservation and World Heritage Designation

Kasori has been promoted for protection by Chiba Prefecture and municipal authorities working with national agencies such as the Agency for Cultural Affairs (Japan), drawing on precedents set by the inscription of Historic Monuments of Ancient Kyoto and proposals akin to those for Jōmon Archaeological Sites in Hokkaidō and Northern Tōhoku. Management strategies reflect practices established at Nara National Museum and Agency for Cultural Affairs (Japan) guidelines, while outreach and museum displays coordinate with Chiba Prefectural Museum of History and Folklore, National Museum of Nature and Science, and international exchange with institutions such as the Smithsonian Institution and UNESCO advisory bodies. Ongoing conservation addresses coastal erosion comparable to interventions at Yoshinogari Site and integrates public education programs modeled after Historic Monuments of Ancient Kyoto visitor initiatives.

Category:Archaeological sites in Japan Category:Jōmon period Category:Chiba Prefecture