[O-02] Poster presentations by senior high school students

[O02-P33] Microfossils from the Kushiro Marsh Core,Hokkaido (2)

*Yuri Hashimoto¹, Chika Onai¹, Aoi Ohashi¹ (1.Gunma Prefectual Ota Girls' High School)

Keywords:ostracode, foraminifera, microfossils, Kushiro Marsh, mite fossils

To identify the paleoenvironment of the Kushiro Marsh in Hokkaido, we studied 42 sediment samples such as the foraminiferas, the ostracodes, the radiorarians, and the mite fossils from the boring core in the middle part of the Marsh. Having studied them, we presumed that the Marsh had a bay with the depth of 3.80 to 8.80 meters in the middle, and 8.90 to 26.50 meters depth in the farthest point of it. We also recognized that the size of the bay had been diminished. We finally discovered that the boring core in the depth of 21.40 to 22.10 meters had many Benthic foraminiferas and some Planctonic foraminiferas.