Shidaka Formation

Coherent formation
Triassic

Sedimentary facies: Marine
Lithofacies (Upper): Sandstone
Lithofacies (Upper, Minor): Coal
Lithofacies (Lower): Interbedded sandstone and shale
Lithofacies (Lower, Minor): Coal, Conglomerate, Breccia
Lithofacies (Basal): Conglomerate
Sedimentary structures (Lower): Slump structures

Thickness: 260 m or thicker

Shidaka Group
[ Upper ]
/--/--/--/--/-
Shidaka Formation
--------------
Okadashimo Formation
--------------
Fumuro Formation
--------------
Hannyaji Formation
~~~~~~~~~~~~~~
[ Lower ]

North zone
[ Upper ]
/--/--/--/--/-
Shidaka Group
~~~~~~~~~~~~~~
Maizuru Granite
/--/--/--/--/-
Maizuru Metamorphic Rocks
/--/--/--/--/-
[ Lower ]

Maizuru Belt
[ North ]
/--/--/--/--/-
North zone
/--/--/--/--/-
Central zone
/--/--/--/--/-
South zone
/--/--/--/--/-
[ South ]

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

Distribution: Shidaka, Maizuru city, Kyoto pref.
Fossils (Shellfishes): Gervillia sp., Myophoria aff. laevigata var. albertii, Myophoria cf. laevigata var. elongata, Myophoria cf. laevigata var. rotunda, Myophoria shidakensis, Myophoria tangoensis, Nucula sp.
Fossils (Shidaka flora): Carpolithus sp., Cladophlebis argutula, Cladophlebis denticulata, Cladophlebis haiburnensis, Cladophlebis maizurensis, Cladophlebis nebbensis, Cladophlebis raciborskii forma intergra, Ckadiphlebis tenuissima, Czekanowskia sp., Neocalamites cf. carrerei, Otozamites sp., Podozamites griesbachi, Podozamites lanceolatus, Taeniopteris shitakensis, Taeniopteris stenophylla, Zamites cf. megaphyllus

Igi and Kuroda (1965) Oeyama, Explanatory Text of the Geological Map of Japan, Scale 1:50,000, Geological Survey of Japan, 81p. (in Japanese with English abstract 12p.)