[ Top ] [ Japanese ]

Mogura Formation (Tamura et l., 1984) Ozaki and Sugiyama, 2018

Invalid synonym: Senshirozawa Formation, Ina Tuff Breccia Member

• Type locality: Minamisawa creek, Moguragawa river, Mogura, Arakura, Hayakawa city, Minamikoma county, Yamanashi prefecture
• Coherent formation
• Miocene
• Correlation: Oharano Formation

• Sedimentary facies: Marine
• Lithofacies: Interbedded conglomerate and sandstone, Interbedded conglomerate, sandstone and mudstone, Sandstone, Interbedded sandstone and mudstone
• Lithofacies (Lower): Andesite reworked tuff breccia, Tuff
• Lithofacies (Lower, Minor): Volcanic breccia, Volcanic conglomerate, Gravelly sandstone, Interbedded sandstone and mudstone, Mudstone
• Sedimentary structures: Parallel stratification, Graded bedding, Sole marks, Flute casts
• Paleocurrent: to Northeast, to East-northeast

• Thickness: 750 - 1,100 m or thicker
• Distribution (East- West): 500 - 1,300 m
• Lower limit: Unconformity (Fujimiyama Formation)

------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Mogura, Arakura - Oharano - Hayakawa, Hayakawa city, Minamikoma county, Yamanashi pref.
• Fossils (Foraminifera): Bathysiphon spp., Bolivina hanzawai, Bulimina spp., Cibicides aknerianus, Cibicides refulgens, Cibrostomoides subglobosum, Cyclammina spp., Discammina? sp., Eggerella spp., Epistominella pulchella, Glabratella cf. patelliformis, Globigerinoides immaturus, Globigerinoides quadrilobatus, Globobulimina spp., Globoquadrina dehiscens, Globorotalia archeomenardii, Globorotalia fehsi lobata, Globorotalia fohsi robusta, Globorotalia siakensis, Gyroidina orbicularis, Gyroidina soldanii, Martinottiella communis, Melonis cf. barleeanum, Melonis cf. pompilioides, Nodosaria spp., Orbulina universa, Sphaeroidinellopsis disjuncta, Stilostomella spp., Trochammina asagaiensis

• Ozaki and Sugiyama (2018) Geology of the Minobu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 169p. (in Japanese with English abstract 7p.)