Pottery From the Dawn of the Jomon, Held in a Nagaoka Museum
On the first floor of the Nagaoka Municipal Science Museum, a few quiet display cases hold pottery thin enough that the walls seem to catch the light. The vessels came out of a small cave on the upper reaches of the Muroya River, deep in the mountains of eastern Niigata, where layers of soil had sealed them for thousands of years. They belong to the Incipient Jomon, the opening chapter of the long prehistoric era that gave Japan some of the oldest pottery known anywhere.
The objects on view are part of a single registered group. When the Agency for Cultural Affairs designated the Muroya Cave finds an Important Cultural Property on December 4, 2000, it counted 1,402 catalogued pieces drawn from a far larger haul. Excavation had produced roughly 20,000 items in all, including the bones of bears, monkeys, and other animals; the designated lot is the portion whose period and type could be identified with confidence.
Among those pieces is something rarely seen from this depth of time: the skeleton of an adult woman, laid in the earth in a flexed position with a deep cooking pot set near her head. It is the oldest human remains found anywhere in Niigata Prefecture.
A Cave That Helped Define an Era
The Muroya Cave opens in a cliff of rhyolite, a hard volcanic rock, on the left bank of the Muroya River within the Agano River system. The river carved the hollow by cutting sideways into the rock face long ago. The opening is modest: about 7 meters wide, 3 meters high, and 8 meters deep, set at an altitude of 218 meters in what is now the village of Muroya in Aga Town, close to the border with Fukushima Prefecture. Above this point the valley holds no settlements at all.
Between 1960 and 1962, the Nagaoka-born archaeologist Nakamura Kozaburo, working at the science museum, led three seasons of digging here together with Ogata Tamotsu, an anatomist from Niigata University's medical school. What they uncovered was a near-textbook record of change. Fifteen distinct layers of cultural deposits had built up inside the cave, and the pottery shifted markedly between them.
The deeper layers mattered most. The upper deposits contained twisted-cord pottery, a type long regarded as the oldest in southern Kanto. Since the lower layers sat beneath that, their contents had to be older still, which pushed the timeline back further than scholars had assumed. The forms and patterns down there broke with what was then considered normal. These findings, alongside those from the nearby Kosegasawa Cave, gave researchers the evidence they needed to define the Incipient Jomon as a distinct earliest stage of the period.
That is why the excavated articles carry their own designation. The cave itself was named a National Historic Site in 1980; the objects pulled from it received separate recognition as an Important Cultural Property two decades later, recognizing their value as a body of study material rather than the ground they came from.
What to Look For in the Cases
Start with the oldest pottery. Five vessels from the lower layers were restored to complete form, and they reward a slow look. The walls are strikingly thin, the bases rounded squares rather than rounded points, and the surfaces carry dense, intricate cord-marking, including added cords and uneven diagonal impressions. Sizes range from small to large deep bowls, and a few pieces even have pouring spouts. For pottery made at the very start of the tradition, the variety of shapes is unexpected.
The stone tools tell a quieter story of change. At Kosegasawa Cave downstream, hunters left behind many pointed projectile tools and stone axes. At Muroya, those forms have almost vanished, and scrapers and irregular flaked tools take over instead. Set the two assemblages side by side and you can read a shift in how people lived and what they needed.
The upper layers add another thread. Pottery there includes twisted-cord and incised-line styles whose centers of distribution lay far away in the Kanto region. Their presence shows that this remote mountain cave stayed in contact with distant communities across a long span of time, serving as a waypoint for the movement of ideas and goods.
Then there is the burial. The woman found in the Early Jomon layer was surrounded by a semicircular arrangement of stones, with the pot beside her head left intact. Standing at the case, it is worth pausing on the fact that the people who shaped these vessels also buried their dead with care, and that the evidence of both survived in the same dark hollow.
Around the Museum
The Nagaoka Municipal Science Museum sits inside Saiwai Plaza, a short walk from Nagaoka Station along the Shinano River. It is a general museum covering both natural history and human history, and the Muroya and Kosegasawa cave finds appear together in the section devoted to Important Cultural Properties. At the entrance, an eight-meter reconstruction of a desmostylian, a sea mammal known from a two-million-year-old local fossil, greets visitors before they reach the archaeology.
The actual cave lies far to the east in Aga Town and is not set up for casual visits; the artifacts, conserved and displayed in Nagaoka, are where the story is best read. Travelers with a deeper interest in Jomon pottery can pair the museum with sites along the Shinano River associated with the flame-style vessels of the middle Jomon, which form their own cultural route through the region.
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Q&A
- Where can I actually see the Muroya Cave artifacts?
- At the Nagaoka Municipal Science Museum, on the first floor of Saiwai Plaza in central Nagaoka. The cave finds are shown in the museum's Important Cultural Property section, alongside material from the nearby Kosegasawa Cave.
- How old are these objects?
- The lower layers date to the Incipient Jomon, the earliest stage of the Jomon period, which began more than 10,000 years ago. The upper layers reach into the Earliest and Early Jomon. Japanese Incipient pottery is among the oldest in the world.
- Can I visit the cave itself?
- The cave is a National Historic Site in a remote part of Aga Town, reached by mountain road and not arranged for general sightseeing. The conserved objects in Nagaoka give a far clearer picture, so most visitors see the finds at the museum.
- What makes the pottery special compared with later Jomon ware?
- The lower-layer vessels are unusually thin-walled with rounded-square flat bases, dense cord-marking, and a surprising range of shapes that includes spouted forms. They capture the moment when pottery-making was just taking shape in Japan.
- How much does it cost to enter the museum?
- Admission to the permanent exhibition is free. Hours are 9:00 to 17:00, with last entry at 16:30. The museum closes on the first and third Mondays of the month, the following day when those fall on a holiday, and over the New Year period.
Basic Information
| Name | Excavated Articles from the Muroya Cave Site, Niigata Prefecture |
|---|---|
| Designation | Important Cultural Property (archaeological materials), designated December 4, 2000 |
| Quantity | One lot; 1,402 catalogued pieces (pottery, stone tools, bone, antler, and shell implements) |
| Period | Jomon period, Incipient through Early phases |
| Original site | Muroya Cave Site (National Historic Site), Muroya, Aga Town, Higashikambara District, Niigata; cave about 7 m wide, 3 m high, 8 m deep, at 218 m elevation |
| Held by | Nagaoka City |
| Where to see | Nagaoka Municipal Science Museum, 2-1-1 Saiwai-cho, Nagaoka City (Saiwai Plaza, 1st floor) |
| Hours and admission | 9:00–17:00 (last entry 16:30); closed 1st and 3rd Mondays, New Year period; free admission |
| Access | About 15 minutes on foot from JR Nagaoka Station, or by bus to the Shiritsu Gekijo-mae stop |
References
- Agency for Cultural Affairs, National Database of Designated Cultural Properties: Excavated Articles from the Muroya Cave Site, Niigata Prefecture
- https://kunishitei.bunka.go.jp/bsys/maindetails/201/10446
- Cultural Heritage Online: Excavated Articles from the Muroya Cave Site, Niigata Prefecture
- https://bunka.nii.ac.jp/heritages/detail/207390
- Cultural Heritage Online: Muroya Cave
- https://bunka.nii.ac.jp/heritages/detail/205183
- Aga Town Board of Education: Muroya Cave
- https://www.town.aga.niigata.jp/agamachi_soshiki/shakai_kyoiku/rekishi_bunkazai/381.html
- Nagaoka Municipal Science Museum (official site)
- https://www.museum.city.nagaoka.niigata.jp/
Last verified: 2026.06.20