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Funakubo Formation (Onuki, 1956) Kawamura et al., 2013

Invalid synonym: Orobetsu Formation, Onimaru Formation

• Type locality: Hakuryu mine, Funakubo, Shiwa city, Shiwa county, Iwate prefecture
• Type locality (Sub): Shiraiwa, Ohasama town, Hanamaki city, Iwate prefecture
• Coherent formation
• Paleozoic volcanic island arc
• Carboniferous, Visean - Moscovian (Corals, Foraminifera)
• Correlation (Lower): Odagoe Formation

• Sedimentary facies (Gray limestone): Shallow marine
• Sedimentary facies (Black limestone): Lagoon
• Lithofacies: Mudstone, Sandstone, Siliceous tuff, Limestone
• Sedimentary structures (Limestone): Cross-stratification

• Thickness: 600 m or thicker

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

• Distribution: Dokutsu - Urushiyama - Hakuryu mine, Funakubo, Shiwa city, Shiwa county, Iwate pref.; Shiraiwa - Orobetsu, Ohasama town, Hanamaki city, Iwate pref.
• Fossils (Limestone): Brachiopods, Crinoids, Corals, Calcareous sponges (Chaetetids), Fusulinids (Millerella? sp.), Bryozoa, Green algae (Koninckopora sp.)
• Fossils (Limestone, Corals): Acaciapora? sp., Carcinophyllum sp., Cravenia sp., Dibunophyllum sp., Diphyphyllum sp., Koninckophyllum sp., Lonsdaleia sp., Michelinia sp., Neozaphrentis sp., Palaeosmilia cf. kitakamiensis, Sinopora sp., Yuanophyllum sp., Zaphrentids
• Fossils (Limestone, Foraminifera): Bradyina sp., Endothyra sp., Pseudostaffella sp.

• Kawamura et al. (2013) Geology of the Hayachine San District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 101p. (in Japanese with English abstract 4p.)
• Uchino et al. (2008) Jour. Geol. Soc. Japan, vol.114, Supplement, pp.141-157 DOI