Archaeologists believe that these structures probably had some special function, perhaps a meeting house or a specialist workshop.
Sources
See the Jomon Timeline and Definition for more specifics on the culture.
See the official Sannai Maruyama website for further information. If you are planning a visit to Japan, the site is open to visitors, with a museum and several reconstructed buildings.
Habu, Junko 2008 Growth and decline in complex hunter-gatherer societies: a case study from the Jomon period Sannai Maruyama site, Japan. Antiquity 82:571–584.
Habu, Junko and Clare Fawcett 1999 Jomon archaelogy and the representation of Japanese origins. Antiquity 73:587-793.
Habu, Junko, Minkoo Kim, Mio Katayama, and Hajime Komiya 2001 Jomon subsistence-settlement systems at the Sannai Maruyama site. Bulletin of the Indo-Pacific Prehistory Association 21:9-21. Free download
Anonymous. The Sannai Maruyama Site: Extraordinarily Large Settlement in Prehistoric Japan. Undated pamphlet available at the Sannai Maruyama site webpage.


