Y2

[ Top ] [ Japanese ]

Y2

Accretionary complex
middle - late Eocene
Intruded by: Sandstone dikes

Sedimentary facies: Marine
Lithofacies (Top): Sandstone-dominant interbedded sandstone and mudstone
Lithofacies (Upper): Interbedded sandstone and mudstone
Lithofacies (Middle): Mudstone-dominant interbedded sandstone and mudstone
Lithofacies (Lower): Mudstone
Sedimentary structures: Graded bedding

Thickness: 600 m

Yasukawa Formation
[ Upper ]
--------------
Y2
--------------
Y1
/--/--/--/--/-
[ Lower ]

Muro Group (North)
[ Upper ]
/--/--/--/--/-
Kogawa Formation
--------------
Uchikoshi Formation
--------------
Yasukawa Formation
/--/--/--/--/-
[ Lower ]

Muro Group (South)
[ Upper ]
/--/--/--/--/-
Shimotsuyu Formation
--------------
Mitogawa Formation
--------------
Wabuka Formation
/--/--/--/--/-
[ 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: Yasukawa river - Osugidani - Nakagoya, Tanabe city, Wakayama pref.; Ichihira - Tamanotani valley, Kozagawa city, Higashimuro county, Wakayama pref.; Okuyamadani valley - Kobaradani valley, Kumanogawa town, Shingu city, Wakayama pref.

Suzuki et al (1979) Geology of the Kurisugawa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 54p. (in Japanese with English abstract 5p.)