N4

Type locality: Sakatai - Kazai - Kshokuchi, Tanabe city, Wakayama prefecture
Accretionary complex
Paleogene, or Late Cretaceous, Campanian

Sedimentary facies: Marine
Sedimentary facies: Continental shelf, Upper continental slope
Lithofacies: Sandstone-dominant interbedded sandstone and mudstone
Lithofacies (Middle, Minor): Mudstone-dominant interbedded sandstone and mudstone
Lithofacies (Minor): Conglomerate, Gravel-bearing mudstone, Greenstones
Sedimentary structures: Graded bedding, Parallel structure, Wave ripples, Flute marks, Groove marks
Paleocurrent (Lateral current flow): to North - Northwest

Thickness: 300 - 640 m or thicker
Upper limit: Bottom of a thick sandstone bed

Nyunokawa Formation
[ Upper ]
/--/--/--/--/-
N5
--------------
N4
--------------
N3
--------------
N2
--------------
N1
/--/--/--/--/-
[ Lower ]

Shimanto Belt (Wakayama pref.)
[ Upper ]
/--/--/--/--/-
Koyasan Group= North Shimanto
/--/--/--/--/-
Hidakagawa Group = North Shimanto
/--/--/--/--/-
Nyunokawa Formation
/--/--/--/--/-
Otonashigawa Group
/--/--/--/--/-
Muro Group
/--/--/--/--/-
[ Lower ]

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

Distribution: Sakatai - Kazai - Kshokuchi - Wadamori - Mitsumatadani valley - Ogyoji - Mount Andosan, Tanabe city, Wakayama pref.; Kamiyukawa river - Teragaito - Obiso - Tonoi, Totsukawa city, Yoshino county, Nara pref.

Tokuoka et al (1981) Geology of the Ryujin District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 69p. (in Japanese with English abstract 6p.)