Settlement Complexes of the Middle Jōmon in Tohoku: Common Features, Local Specifics and Terms

Over the past decade, the data on the archaeological cultures of the Japanese archipelago, from the Paleolithic to the Kofun period, have been actively introduced into the Russian archaeology. These materials concern various aspects of the subsistence life of local tribal formations. This study discusses features of the internal structure of the Middle Jōmon settlements from the Tohoku region. The article presents the data from archaeological reports of the most significant sites of this period. Some materials about Middle Jōmon sites (such as Sannai Maruyama, Goshono) were previously published in Russian periodicals, however, the overwhelming majority of data have been presented for the first time. The main attention is paid to the description of the site location, the characteristics of pit-dwellings and raised-floor buildings, household and ritual objects, their location relative to each other, with a short mention of the discovered artifacts. The article was based on materials of the author’s PhD dissertation research “The Middle Jōmon period of Honshu island (5–4 thousand years ago): general characteristics and local features” [Ivanova, 2018].

Climatic reconstruction at the Sannai-Maruyama site between Bond events 4 and 3—implication for the collapse of the society at 4.2 ka event

The Jōmon period/culture corresponds to the Neolithic period/culture in Japanese prehistory. The Sannai-Maruyama site (5.9–4.2 cal. kyr BP), the most famous, the largest, and the well-studied mid-Holocene (mid-Jōmon) archeological site inhabited by hunter-gatherers with sedentary lifestyle in northern Japan, started at early Bond event 4 and collapsed at late Bond event 3 (4.2 cal. kyr BP at the boundary between mid-Holocene, Northgrippian, and late-Holocene, Meghalayan), synchronous with the decline of the north Mesopotamian civilization and the Yangtze River civilization in China. Alkenone sea surface temperatures (SSTs), a proxy for early-midsummer SSTs, generally suggest that the early-midsummer SSTs (and atmospheric temperatures (ATs)) at 41° 00′ N, 140° 46′ E, about 20 km north to the Sannai-Maruyama site, located in Aomori Prefecture, peaked around 4.8–4.3 cal. kyr BP and showed minima at 5.9 and 4.1 cal. kyr BP. In spite of some discrepancy in short periods, this feature is consistent with that estimated from the assemblages of Ostracodas. δ18O value of benthic foraminifera of Nonionellina labradorica and Nonionella stella, alkenone production flux, and pollen assemblages could reflect annual-based temperature, which generally suggests that the climate was warmer at 6.0–4.2 cal. kyr BP, which could show the warmer environments at 6.0–5.0 cal. than expected from alkenone SST in early-midsummer. Overall, northward shift of the westerly jet, in association with a strengthened East Asian Summer Monsoon, could cause a relatively warm climate around 6.0–4.3 cal. kyr BP, when the Sannai-Maruyama site flourished. High food production density, by effective hansaibai (selective preservation or growth) in Castanea- and Aesculus-dominated forests, up to one sixth of the rice production density, could have supported high population density, resulting large community at the Sannai-Maruyama site. Cooling episode at 4.2 cal. kyr BP could have resulted in the decline of chestnut hansaibai, leading to the collapse of the site. Recent results from a compiled archeological site map suggested no large decline of the population but, instead, a dispersal to the surrounding area at 4.2 cal. kyr BP. It is consistent with ancestral population dynamics for the descendent from Jōmon people, in contrast to those from the immigrants from Far East Asia to the Japanese Archipelago with paddy rice cultivation technology after 2.9 cal. kyr BP, based on modern Japanese molecular sequences.

Growth and decline in complex hunter-gatherer societies: a case study from the Jomon period Sannai Maruyama site, Japan

The Sannai Maruyama site (3900-2300 BC) is one of the largest known from Japan's Jomon period (14000-300 BC). This study shows that over 1500 years the number of dwellings, their size, the type of stone tools and the fondness for figurines varied greatly. Nor was it a story of gradual increase in complexity: the settlement grew in intensity up to a peak associated with numerous grinding stones, and then declined to a smaller settlement containing larger buildings, many arrowheads and virtually no figurines. Using a bundle of ingenious analyses, the author explains what happened.