@article{oai:niigata-u.repo.nii.ac.jp:00006882,
 author = {Yasui, Satoshi and Watanabe, Kikuo and Kamoi, Yukihiko and Kobayashi, Iwao},
 journal = {Science reports of Niigata University. (Geology), Science reports of Niigata University. (Geology)},
 month = {Mar},
 note = {Foraminiferal assemblages of a drilling core in the Shirone area, Echigo Plain, central Japan are analyzed, and the stratigraphical change of the Holocene sedimentary environment of this area is discussed on the basis of the change of lithological facies and the foraminiferal assemblages. The geologic profile of the core is divided into four sedimentary units, U-1 to U-IV in descending order. Moreover, U- III is subdivided into SU- III -1 and -2. U-II, U- III and U-IV　contain foraminifers. Foraminiferal fauna is divided into four divisions, Foraminiferal Divisin (F.D.)-A to -D. F.D. -A, -B, -C and- D correspond to U-II, SU-III-1, SU-III-2 and U-IV respectively. The F.D.-A consists of Ammonia beccarii Assemblage. The F.D.-B does mainly Ammonia beccarii-Quinqueloculina akneriana Assemblage. The F.D.-C does mainly Ammonia beccarii- Elphidium etigoense Assemblage. The F.D.-D does Ammonia beccarii Assemblage. Sedimentary environments have successively been changed oligohaline to mesohaline water of innermost bay in U-IV, polyhaline to mesohaline water of inner to outer bay in SU-III-2, and oligohaline to mesohaline water of lagoon in SU- III -1 to U-II, from 10,000 to 6,000 years ago. The sea expansion in the Echigo Plain corresponded to the age of Holocene transgression. And it is noticeable that a lagoonal environment had been took the place of bay's one, or that　a lagoonal environment appeared about 7,000 years ago. It may be caused by the formation of sand barrier situated in the coastal area of the Echigo Plain.},
 pages = {67--89},
 title = {Holocene foraminiferal fauna and sedimentary environment in the Shirone area, Echigo Plain, central Japan},
 volume = {15},
 year = {2000}
}