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Built structures · Place · Pits and cavities

Jōmon flask-shaped storage pit

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At Sannai Maruyama in Aomori, some Jōmon storage pits had a narrow mouth and broad floor, with larger examples reaching two metres deep; nuts or chestnuts are the proposed stores.

Cutaway illustration of a narrow-mouth pit widening beneath the ground at Sannai Maruyama; its empty chamber shows the reported flask-like form.

A narrow entrance above a broad store

At Sannai Maruyama, a settlement in Aomori, storage pits were dug outside the residential area at the edges of flat ground. Some of the excavated features have a flask-like outline: a small opening leads to a much broader floor. The site interprets them as places for storing nuts or chestnuts, although that is a probable function rather than a statement about every pit's contents.

The largest pits reach about two metres deep. The official description does not give their mouth width, floor diameter, lining, cover, or exact excavation sequence. The profile matters because a narrow opening sits above a larger storage space, but the available account does not specify how people accessed or closed each example.

Sources for this section

Storage evidence, not fermentation

These features belong to a settlement with a long Jōmon occupation and substantial plant use. The site profile describes the broader settlement chronology as approximately 3900–2200 BCE; that range should not be mistaken for a precise date on an individual pit. The storage-pit page itself presents the nut or chestnut interpretation as probable.

The excavated form supports a dug storage structure, not a fermentation vessel. The sources inspected do not document fermentation, a moisture-control system, a lining material, or a standard preservation method. The narrow-mouth, broad-floor form is reported for some pits, so it should not be imposed on every underground feature at the site.

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Limits of reconstruction

The official page includes a photograph of a pit during excavation, which supports the archaeological subject but does not show a complete reconstructed fill or closure. A more detailed cutaway would need evidence for the unseen floor contents, lining and sealing; those details are not specified in the inspected account. This record therefore describes only the supported profile and probable storage use.

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History

The Sannai Maruyama site's official account identifies flask-shaped storage pits with a narrow opening and large floor, interpreted as nut or chestnut stores. Individual pits are not separately dated in that account.

Site

SettingOutside the Sannai Maruyama settlement, along the edges of a flat area.
GroundThe official site description establishes dug pits but does not identify soil type, wall treatment or lining.
ClimateNot described in the pit account.
FootprintSome larger examples reached approximately 2 metres in depth; mouth width and floor dimensions are not specified.
NotesThe flask profile is reported for some, not all, storage pits. Their contents are interpreted as nuts or chestnuts rather than identified in every feature.

A build is made where it stands: moving it means building it again.

How it is built

Materials

  • Ground — Pits were dug beyond the settlement at the edge of a flat area; exact soil and lining are not described.
  • Nuts or chestnuts — Proposed stored contents in the site's interpretation; the specific contents of each pit are not established.
  1. At Sannai Maruyama, pits were located outside the settlement at the edges of flat ground.
  2. Some had a small opening above a much wider floor, giving a flask-like profile; larger pits reached about 2 metres in depth.
  3. The site interprets these features as probable nut or chestnut stores. Its account does not describe how they were excavated, lined, filled or closed.

Places

Sannai Maruyama Site, Aomori City

Historical attestation · Locality evidence

UNESCO reference point for component 1632-007, Sannai Maruyama Site. Locates the 23.5 ha archaeological site, not a separately surveyed individual storage pit.

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