Nariki Unit

[ Top ] [ Japanese ]

Nariki Unit (Ozawa, 1975) Ueki and Sakai, 2007

Invalid synonym: Nariki Formation

Type locality: 5 chome - 6 chome, Nariki, Ome city, Tokyo
Accretionary complex
Accretion: Early - Late Jurassic

Sedimentary facies: Marine
Lithofacies: Sandstone, Interbedded sandstone and mudstone, Mélange facies
Matrix: Mudstone
Exotic blocks (Crusts, Slabs): Chert, Basaltic lava, Volcaniclastic rocks, Limestone

Upper limit: Unconformity (Osoki 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: Takinari - Narikigawa river - Osasu - Osoki - Kurosawa river, Ome city, Tokyo; Naguri river, Shimonaguri, Hanno city, Saitama pref.
Fossils (Limestone, Fusulinids): Fusulinella? protofica, Fusulinella pseudobocki, Neoschwagerina margaritae, Pseudoendothyra ozawainellaeformims, Pseudofusulina vulgaris, Staffella pseudosphaeroidea, Yabeina aff. columbiana, Yabeina globosa
Fossils (Mudstone, Radiolarians): Pseudoalbaillella sp.

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.)
Sakai (1987) Geology of the Itsukaichi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 75p. (in Japanese with English abstract 5p.)