| No. | K02 |
| Description | Flat-bottomed rouletted pattern pottery vessels |
| Site | Tokoro River Estuary Site: Layer Ⅷ |
| Size (cm) | (4th from the left) H. 53～(3rd from the left) H. 15 |
| Period | Middle Jomon |
| Date | ca. 5,500-4,800 years ago |
| Possessor | Kitami City Board of Education |
| Comment | This is a typical example of “Rouletted Pattern Pottery Group Ⅰ from the Tokoro River Estuary Site.” Since this type of pottery was unearthed from a stratum above Group Ⅱ, it was adopted in the first half of the Middle Jomon period. Its key features are that many from Group Ⅱ are larger than Group Ⅰ, they have puncture marks decorated by square bars or bamboo tube-shaped tools instead of round puncture marks in the rim, and there are four triangular projections on the rim. |
