Nitayama Unit

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Nitayama Unit (Morikawa, 1950) Ueki and Sakai, 2007

Invalid synonym: Nitayama Formation

Type locality: Nitayama pass, Hanno city, Saitama prefecture
Accretionary complex
Deposition (Mudstone): Middle Jurassic, Bajocian - Bathonian
Accretion: Middle Jurassic

Sedimentary facies: Marine
Lithofacies: Mélange facies
Matrix: Mudstone
Exotic blocks (Crusts, Slabs): Sandstone, Chert, Basalt lava, Volcaniclastic rocks
Exotic blocks (Crusts, Slabs, Minor): Limestone

Upper limit: Unconformity (Narikigawa Formation, Osoki Formation, Nihondake Formation, Tomioka Formation, Hanno Formation)

Chichibu Belt (eastern Ome, Tokyo)
[ Upper ]
/--/--/--/--/-
Nariki Unit
/--/--/--/--/-
Raidenyama Unit
/--/--/--/--/-
Minokuchi Unit
/--/--/--/--/-
Nitayama Unit
/--/--/--/--/-
Nakato 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: Nitayama pass, Hanno city, Saitama pref.; Nariki river, Ome city, Tokyo; Kurosawa river - Iwakura hot spring, Osoki, Ome city, Tokyo

Ueki and Sakai (2007) Geology of the Ome District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 189p. (in Japanese with English abstract 5p.)