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北部フォッサマグナの新第三系内村層から産出した浮遊性有孔虫化石
Planctonic Foraminifers From the Uchimura Formation, Northern Fossa Magna, Central Japan
小坂, 共栄
久保田, 正史
大塚, 繁
備前, 信之
In the core of the Uchimura Mountain Range, greenish altered volcaniclastic rocks crop out extensively. On the contraly to this, the south to south-western part of this mountain is occupied by normal sediments such as conglomerate, sandstone or mud stone. These normal and volcaniclastic sediments, which are named the Uchimura formation by Honma (1931), have an interfingering relationships widely in the central part of this mountain. The Hongo Facies have been adopted as the facies name to these normal sediments in the Uchimura Formation. For a long time, index fossils has not been found in these sediments, therefore the Uchimura Formation have been regarded as lower Miocene in age roughly.In this paper the author report the planctonic foraminifers found in the uppermost horizon of the Uchimura Formation. Planctonic foraminifers found in the uppermost horizon of the Uchimura formation are characterised by following species, such as Globigerina angustiumbilicata BOLLI, Gg. bulloides d' ORBIGNY, Gg. druryi AKERS, Gg eamesi BLOW, Gg. falconensis BLOW, Gg. praebulloides BLOW, Gg. sp., Globorotalia archeomenardii BOLLI, Gr. panda JENKINS, Gr. praescitula BLOW, Gr. scitula (BRADY), Gr. sp., Globigerinoides obliquus BOLLI, Gs. quadrilobatus (d' ORBIGNY) Gs. sp., Globoquadrina dehiscens (CHAPMAN, PARR and COLLINS), Gq. baroe moenensis (LEROY), Gq. venezuelana (HEDBERG), Gq. sp., Dentoglobigerina altispira altispira (CUSHMAN and JENKINS), Globigerinella obesa (BOLLI), Ge. sp., Globigerinita glutinana (EGGER), Sphaeroidinellopsis disjuncta (FINLAY), Ss. seminulina seminulina (SCHWAGER), Orbulina bilobata (d' ORBIGNY), Martinottiella communis, Trifarina sp. Form these facts it is concluded that the upper most part of the Uchimura Formation can be assinged to planctonic foraminiferal zone N9 (Blow, 1969).
Article
信州大学理学部紀要 24(2): 27-34(1990)
departmental bulletin paper
信州大学理学部
1990-03-30
application/pdf
信州大学理学部紀要
2
24
27
34
0583-063X
AA00697923
https://soar-ir.repo.nii.ac.jp/record/12101/files/Science24-02-03.pdf
jpn