M3

[ Top ] [ Japanese ]

M3

Accretionary complex
middle - late Eocene

Sedimentary facies: Marine
Lithofacies: Sandstone, Sandstone-dominant interbedded sandstone and mudstone
Lithofacies (Minor): Mudstone
Sedimentary structures: Parallel stratifiction, Graded bedding, Upward fining, Flute marks, Prod marks, Groove marks, Wave ripples, Slump structure
Paleocurrent: from North-northeast - Northwest, from Southwest - West-southwest

Thickness: 750 - 1,800 m
Lower limit: Conformity (M2)

Mitogawa Formation
[ Upper ]
--------------
M3
--------------
M2
--------------
M1
/--/--/--/--/-
[ 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: Fukuidani valley - Kobushigawa river - Takimatadani valley - Kurumidani valley - Masago Hiraigawa river - Soinogawa river - Tanigawa river, Kozagawa city, Higashimuro county, Wakayama pref.; Ogama - Nishinogawa river - Mount Juzenyama - Shimodogawa - Hirosedani valley - Magari - Shirajima - Nishinohama - Okanokuroshima island - Amadori, Susami city, Nishimuro county, Wakayama pref.
Fossils (Trace fossils): Paleodictyon isp.

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.)
Tateishi et al. (1979) Geology of the Esumi District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 65p. (in Japanese with English abstract 6p.)