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Oidawara Formation

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Journal Article
Published: 01 February 2006
Geochemistry: Exploration, Environment, Analysis (2006) 6 (1): 33–48.
... by unconformities. In ascending order, they are the Toki Lignite-bearing Formation (here referred to as the Toki Formation), Hongo Formation, Akeyo Formation and Oidawara Formation. The Toki and Hongo Formations consist of fluvial–lacustrine deposits of carbonaceous mudstones, arkosic sandstones and sporadic...
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Journal Article
Published: 01 February 2006
Geochemistry: Exploration, Environment, Analysis (2006) 6 (1): 5–12.
... of fault activity on the migration and immobilization of U. They compared the thickness of each formation of the Mizunami Group in the hanging wall and the footwall of the Tsukiyoshi Fault around the Tono Mine. They found a change in thickness of the Akeyo and Oidawara Formations across the fault ( Fig. 2...
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Journal Article
Published: 01 May 2002
Quarterly Journal of Engineering Geology and Hydrogeology (2002) 35 (2): 189–202.
...: the Toki Formation, the Akeyo Formation and the Oidawara Formation ( Yusa & Yamakawa 1992 ; Yusa et al. 1993 ; Yusa & Sakuma 1994 ; Shikazono & Utada 1997 ). The Toki Formation is mainly a freshwater lacustrine deposit, although fluvial sediments also occur. In contrast, the Akeyo Formation...
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Series: Geological Society, London, Geology of Series
Published: 01 January 2016
DOI: 10.1144/GOJ.12
EISBN: 9781862397064
..., and is unconformably overlain by the Pliocene-Pleistocene Seto Group. The Mizunami Group consists of four formations, namely the Toki (lignite-bearing), Hongo, Akeyo and Oidawara formations in ascending order (Itoigawa 1974a) (Fig. 6.14 ). The Toki Formation is a lignite-bearing succession and is distributed only...
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Journal Article
Published: 01 February 2006
Geochemistry: Exploration, Environment, Analysis (2006) 6 (1): 13–31.
...; marine Oidawara Formation deposited; regression Seawater, reducing Fresh, oxidizing then reducing, saline Constant Increase to a maximum Decrease End previous 5 Erosion Fresh, oxidizing Reducing, saline then fresh, oxidizing Constant Decrease Increase Up to 3 times between 17 and 5...
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Journal Article
Published: 01 January 2013
Journal of Micropalaeontology (2013) 32 (1): 59–86.
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Journal Article
Published: 01 January 2004
Micropaleontology (2004) 50 (2): 105–147.
...). It is composed of four units: the Toki (non-marine sandstone and mudstone with coal beds), Hongo (non-marine tuffaceous sandstone and tuff), Akeyo (marine tuffaceous sandstone and mudstone) and Oidawara (marine diatomaceous mudstone) Formations ( Itoigawa 1960 , 1974 , 1980 ). Text-figure 2 shows...
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Journal Article
Published: 19 November 2015
Journal of Micropalaeontology (2016) 35 (1): 26–53.
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