@article{oai:soar-ir.repo.nii.ac.jp:00012120, author = {公文, 富士夫 and 井内, 美郎}, issue = {1}, journal = {信州大学理学部紀要}, month = {Nov}, note = {Grain-size analysis of muddy sediments taken from the bottom surface of Lake Nojiri was carried out by the method of JIS A 1204, so called hydrometer analysis. Most sediments are clayey silt, and six samples are silty clay. C-M pattern diagram of these sediments indicates that the most sediments are pelagic or hemipelagic, transported by suspension. Silty clay sediments whose median grain-size are larger than 8.0 phi, are distributed in a small elongated area off the Momigasaki. The locality is not the center of the lake but also not the deepest part of the lake. Such a distribution pattern seems to be related to some flow mechanisms such as a circulation current. Sediment of ST-3 off the mouth of the River Sugakawa is sandy silt. It probably results from the pour of the river. Sample of ST-31 taken from the subsurface terrace at 20 meters deep is ill-sorted gravelly sand. It seems to be relict sediment or old debris flow deposit. Sediment of ST-35 is muddy sand. It is near the southern margin of the basin plain of 36 to 38 meters in depth. Its origin is unknown., Article, 信州大学理学部紀要 22(1): 39-48(1987)}, pages = {39--48}, title = {中部地方,野尻湖底堆積物の粒度分析(予報)}, volume = {22}, year = {1987} }