Futagoyama Limestone

Type locality: Mount Futagoyama, Ogano city, Chichibu county, Saitama prefecture
Accretionary complex
A huge slub of reef limestones in an accretionary complex
Deposition (Limestone): Late Carboniferous - Early Permian
Accretion: Jurassic

Sedimentary facies: Marine
Lithofacies: Limestone
Lithofacies (Minor): Oolitic limestone

Distribution (Length): ca. 1.4 km
Distribution (Width): ca. 20 - 250 m

Sumaizuku Unit
[ East ]
/--/--/--/--/-
Hakusekisan Limestone
/--/--/--/--/-
Futagoyama Limestone
/--/--/--/--/-
Kanozan Limestone
/--/--/--/--/-
[ West ]

Northern Chichibu Belt
[ Upper ]
/--/--/--/--/-
Sumaizuku Unit
/--/--/--/--/-
Hebiki Unit
/--/--/--/--/-
Kazahayatoge Unit
/--/--/--/--/-
Kamiyoshida Unit
/--/--/--/--/-
Kashiwagi Unit
/--/--/--/--/-
[ Lower ]

Chichibu Belt
[ Upper ]
/--/--/--/--/-
Kurosegawa Belt
/--/--/--/--/-
Northern Chichibu Belt
/--/--/--/--/-
Southern Chichibu Belt
/--/--/--/--/-
[ Lower ]

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

Distribution: Mount Kanozan, Kagahara, Kanna city, Tano county, Gunma pref.
Fossils: Gastropods, Corals
Fossils (Fusulinids): Fusulina ichinotaniensis, Fusulina lanceolata, Fusulinella asiatica, Fusulinella pseudobocki, Pseudofusulina ahlfeldi, Pseudofusulina futagoensis, Pseudofusulina sokensis, Quasifusulina longissima, Rugosofusulina serrata, Triticites kawanoboriensis, Triticites noinski, Triticites ozawai, Triticites samaricus, Triticites yayamadakensis

Okubo and Horiguchi (1969) Geology of the Mamba District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 65p. (in Japanese with English abstract 5p.)