Tokunaga Sandstone Member

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Accretionary complex
Deposition (Chert): middle Permian - late Triassic (Conodonts, Radiolarins)
Deposition (Sandstone): Middle Jurassic, Callovian (Ammonoids)
Deposition (Siliceous shale): Middle Jurassic (Radiolarins)

Sedimentary facies: Marine
Lithofacies: Coherent facies
Lithofacies (Minor): Mélange facies
Lithofacies: Sandstone, Sandstone-dominant interbedded sandstone and mudstone
Exotic blocks (Crusts): Chert, Greenstones, Siliceous shale, Conglomerate
Sedimentary structures: Cross stratification, Sole marks
Paleocurrent: from Northwest to Southeast

Thickness: 5,000 - 6,000 m

Kodaragawa Formation
[ Upper limit ]
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Fukazara Sandstone and Mudstone Member = Samondake Unit
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Komami Siliceous Shale Member = Samondake Unit
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Tokunaga Sandstone Member
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[ Lower limit ]

Mino Belt (Mino region)
[ Upper ]
/--/--/--/--/-
Yunoo Complex
/--/--/--/--/-
Imajo Complex
/--/--/--/--/-
Funafuseyama Unit
/--/--/--/--/-
Misogawa Complex = Kanayama Unit
/--/--/--/--/-
Yabuhara Complex
/--/--/--/--/-
[ Lower ]

Mino Belt (Mino, Gifu pref.)
[ Upper ]
/--/--/--/--/-
Sakamototoge Unit
/--/--/--/--/-
Samondake Unit
/--/--/--/--/-
Kamiaso Unit
/--/--/--/--/-
Funafuseyama Unit
/--/--/--/--/-
Nabi Unit
/--/--/--/--/-
Kanayama Unit
/--/--/--/--/-
Kuze Unit
/--/--/--/--/-
[ Lower ]

Mino Belt (Gifu pref. - Shiga pref.)
[ Upper ]
/--/--/--/--/-
Kashimagari Unit
/--/--/--/--/-
Samondake Unit
/--/--/--/--/-
Funafuseyama Unit
/--/--/--/--/-
Kuze Unit
/--/--/--/--/-
[ Lower ]

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

Distribution: Shima - Basara - Ishihara - Insuzume - Kawasa, Hachiman town, Gujo city, Gifu pref.; Sanbora, Itadori, Seki city, Gifu pref.
Fossils: Ammonoids (Kepplerites (Seymourites) sp.), Wood fragments, Trace fossils
Fossils (Radiolarians): Angulobracchia sp., Archaeodictyomitra spp., Archaeospongoprunum compactum, Canoptum sp., Cyrtocapsa mastoidea, Dictyomitrella? kamoensis, Emiluvia sp., Eucyrtidium? unumaensis, Foremanina sp., Gorgansium spp., Hozmadia? spp., Hsuum maxwelli, Napora spp., Pantanellum foveatum, Parafollicucullus sp., Parasaturnalis, Paronaella spp., Pratunuma fusiformis, Pseudoalbaaillella sp., Saitoum sp., Spongonaturnalis ? suboblongus, Stichocapsa? sp., Tetratrabs sp., Triassocampe cf. deweveri, Tricolocapsa conexa, Tricolocapsa? fusiformis, Tricolocapsa plicarum, Tricolocapsa cf. ruesti, Tripocyclina? sp., Tritrabs cf. ewingi, Unuma echinatus, Zartus sp.
Fossils (Conodonts): Cypridodella spp., Epigondolella bidentata, Gondolella spp., Lonchodina spp., Neogondolella timocrensis, Neospathodus bransoni, Neospathodus elongatus, Neospathodus homeri, Neosphathodus pakistanensis, Neostreptognathodus preyi

Wakita (1984) Geology of the Hachiman District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 89p. (in Japanese with English abstract 6p.)