2024-03-28T09:01:38Z
https://niigata-u.repo.nii.ac.jp/oai
oai:niigata-u.repo.nii.ac.jp:00006845
2022-12-15T03:40:06Z
176:177:178:192
453:456
Fusuline foraminifera from the basal part of the Sakamotozawa Formation, South Kitakami Belt, Northeast Japan
Fusuline foraminifera from the basal part of the Sakamotozawa Formation, South Kitakami Belt, Northeast Japan
Ueno, Katsumi
Tazawa, Jun-ichi
Shintani, Tomohiko
Early Permian
fusuline foraminifera
Northeast Japan
Sakamotozawa Formation
Sakmarian
South Kitakami Belt
A small fusuline fauna, composed of Schubertella sp., Quasifusulina? sp., Rugosofusulina sp., Eoparafusulina aff. perplexa (Grozdilova and Lebedeva), and Nipponitella explicata Hanzawa, is described for the first time from the basal part (Sa member) of the Sakamotozawa Formation in the type (Nagaiwa) area, South Kitakami Belt, Northeast Japan. The fauna is somewhat similar to that from the lower part of the overlying Sb member with a Sakmarian age, but lacks Robustoschwagerinanunosei (Hanzawa), which is biostratigraphically the most significant fusuline species of the latter. This faunal similarity, together with conformable stratigraphic relationship between the Sa and Sb members, suggests that the present Sa fauna is also highly probably referable to the Sakmarian. It is further concluded that the base of the Sakamotozawan Stage widely used in the regional Permian chronostratigraphic subdivisions of Japan broadly coincides with that of the Sakmarian in the standard international chronostratigraphic scale of the Permian System.
新潟大学理学部
2007-03
eng
departmental bulletin paper
http://hdl.handle.net/10191/6240
https://niigata-u.repo.nii.ac.jp/records/6845
AA11436808
13491237
Science reports of Niigata University. (Geology)
Science reports of Niigata University. (Geology)
22
15
33
https://niigata-u.repo.nii.ac.jp/record/6845/files/22_15-33.pdf
application/pdf
19.3 MB
2019-08-06