[ Top ] [ Japanese ]

Sawando Complex (Otsuka, 1986) Otsuka, 1988

Invalid synonym: Sawando Belt, Tokugotoge Formation, Azusagawa Group

• Type locality: Azusagawa river, Sawando, Azumi, Matsumoto city, Nagano prefecture
• Accretionary complex
• Deposition (Limestone): Middle Permian (Fusulinids)
• Deposition (Chert): Middle - Late Triassic, Anisian - Rhaetian (Conodonts)
• Deposition (Chert): Early Jurassic (Radiolarians)
• Deposition (Tuffaceous siltstone, Siliceous mudstone): Middle Jurassic (Radiolarians)
• Deposition (Siliceous mudstone, Mudstone): Middle Jurassic (Radiolarians)
• Deposition (Interbedded sandstone and mudstone): Late Jurassic (Radiolarians)
• Accretion: Jurassic
• Correlation: Kamiaso Unit
• Correlation (Chert breccia): Wadano Conglomerate
• Intruded by: Ariake Granite, , Ichinosawa Granite, Nishimata Granite, Yakeiwadani Granodiorite, Quartz porphyry dyke, Andesite dyke

• Sedimentary facies: Marine
• Sedimentary facies (Top): Turbidite
• Lithofacies: Coherent facies (Chert-clastic sequence)
• Lithofacies: Repeats of the following sequence from lower level: Siliceous clay rocks - Chert - Tuffaceous siltstone - Siliceous mudstone - Mudstone - Interbedded sandstone and mudstone.
• Lithofacies (Top): Interbedded sandstone and mudstone
• Lithofacies (Top, Minor): Conglomerate
• Lithofacies (Upper): Mudstone
• Lithofacies (Middle): Siliceous Mudstone
• Lithofacies (Lower): Tuffaceous siltstone
• Lithofacies (Bottom): Chert
• Lithofacies (Basal): Siliceous claystone
• Sedimentary structures: Graded bedding, Groove marks, Flute marks, Bounce marks, Load cast
• Paleocurrent: from North to South

• Thickness: Several hundreds - 1,000 m
• Thickness (Interbedded sandstone and mudstone): several hundred m
• Thickness (Mudstone): 5 - 25 m
• Thickness (Siliceous mudstone): 10 - 40 m
• Thickness (Tuffaceous siltstone): 0 - 50 m
• Thickness (Chert): 20 - 112 m
• Thickness (Siliceous claystone): 0 - 12 m
• Upper limit: Thrust fault (Shirahone Complex), Unconformity (Higashimata-Funayama Welded Tuff, Takadaru Welded Tuff, Nyukawa Pyroclastic Flow Deposit)
• Lower limit: Thrust fault (Shimashima Complex, Misogawa Complex)

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

• Distribution: Sawando - Nagawa - Kasumizawa creek - Midonogawa river - Shimashimadani valley - Yamagoezawa creek - Tokugo toge, Mount Otakiyama - Mount Chogadake - Mount Kasumizawadake - Ninomatadani valley - Mount Yokodoshidake, Matsumoto city, Nagano pref.; Hotokezaki - Shiroyama, Tokiwa, Omachi city, Nagano pref.; Karasugawa river - Kitanosawa creek, Hotaka, Azumino city, Nagano pref.; Mount Akaiwdake - Mount Nishidake, Omachi city, Nagano pref.; Takane dam, Takane town, Takayama city, Gifu pref.
• Fossils (Limestone): Fusulinids
• Fossils (Mudstone): Trace fossils (Helminthoids), Plants
• Fossils (Chert, Conodonts): Epigondolella abneptis, Epigondolella bidentata, Epigondolella primitiva, Gladigondolella tethydis, Gondolella excelsa, Gondolella haslachensis, Gondolella polygnathiformis, Misikella hernsteini, Misikella posthernsteini
• Fossils (Radiolarians): Archicapsa pachyderma, Canoptum sp., Cyrtocapsa? kisoensis, Cyrtocapsa mastoidea, Diacanthocapsa normalis, Eucyrtidiellum ptyctum, Eucyrtidiellum unumaense, Gigi sp., Guexella aff. nudata, Hsuum hisuikyoense, Mesosaturnalis hexagonus, Mirifusus cf. guadalupensis, Palaeosaturnalis? convertus, Palaeosaturnalis elegans, Palaeosaturnalis cf. fissa, Palaeosaturnalis heisseli, Palaeosaturnalis triassicus, Palaeosaturnalis cf. zapferi, Parahsuum simplum, Parvicingula gigantocornis, Podobursa sp., Staurodorus sp., Stichocapsa asiatica, Stichocapsa convexa, Stichocapsa cf. japonica, Stichocapsa tegiminis, Striatojaponocapsa plicarum, Stylocapsa catenarum, Stylocapsa? spiralis, Syringocapsa sp., Triassocampe deweveri, Tricolocapsa conexa, Tricolocapsa fusiformis, Tricolocapsa parvipora, Tricolocapsa plicarum, Tricolocapsa rüsti, Tricolocapsa tetragona, Trillus sp., Tripocyclina sp., Unuma echinatus, Williriedellum sp., Zartus sp.

• Harayama (2015) Jour. Geol. Soc. Japan, vol.121, no.10, pp.373-389, DOI
• Harayama et al. (2009) Geology of the Matsumoto District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 63p. (in Japanese with English abstract 3p.)
• Yamakita and Otoh (2000) Structural Geology, vol.44, pp.5-32
• Nakano et al. (1995) Geology of the Norikuradake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 139p. (in Japanese with English abstract 4p.)
• Harayama et al. (1991) Geology of the Yarigatake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 190p. (in Japanese with English abstract 8p.)
• Harayama (1990) Geology of the Kamikochi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 175p. (in Japanese with English abstract 11p.)
• Yamada and Kobayashi (1988) Geology of the Ontakesan District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 136p. (in Japanese with English abstract 9p.)
• Kato and Sato (1983) Geology of the Shinano-Ikeda District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 93p. (in Japanese with English abstract 7p.)