Toyooka Formation

Coherent formation
Miocene (16.0 - 13.1 Ma, FT; 15.4 Ma, U-Pb)
Correlation: lower Iwami Formation, Tottori Group

Sedimentary facies (Upper): Shallow marine
Sedimentary facies (Lower): Fluvial, Lacustrine
Lithofacies (Upper): Interbedded conglomerate and sandstone
Lithofacies (Lower): Conglomerate
Lithofacies (Minor): Rholitic lava, Pyroclastic rocks, Mudstone
Sedimentary structures: Trough cross-stratification, Ripple

Thickness: ca. 600 m
Upper limit: Conformity (Muraoka Formation, Amino Formation)
Lower limit: Disconformity (Yoka Formation) Unconformity (Miyazu Granite)

Hokutan Group (northern Kyoto pref.)
[ Upper ]
?--?--?--?--?-
Tango Formation
~~~~~~~~~~~~~~
Amino Formation
--------------
Toyooka Formation
~~~~~~~~~~~~~~
Yoka Formation
--------------
Takayanagi Formation
~~~~~~~~~~~~~~
[ Lower ]

Hokutan Group (northern Hyogo pref.)
[ Upper ]
?--?--?--?--?-
Muraoka Formation
--------------
Toyooka Formation
~~~~~~~~~~~~~~
Yoka Formation
--------------
Takayanagi Formation
~~~~~~~~~~~~~~
[ Lower ]

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

Distribution: southwest - northeast Tottori pref.
Distribution: Toyooka city, Hyogo pref.; Imagoura seashore - Muraoka, Kami city, Mikata county, Hyogo pref.; Hamasaka, Shinonsen city, Mikata county, Hyogo pref.; Kumihama - Amino, Kyotango city, Kyoto pref.; Ine city, Yosa county, Kyoto pref.
Fossils (Aniai-Daijima mixed type flora): Plants
Fossils: Bivalves, Gastropods, Mammals (Footprints), Foraminifera (Operculina complanata japonica)
Fossils (Trace fossils): Schaubcylindrichnus isp., Paleophycus isp.

Haji and Yamaji (2019) Jour. Geol. Soc. Japan, vol.125, no.9, pp.685-698 DOI
Haji and Yamaji (2017) Jour. Geol. Soc. Japan, vol.123, no.12, pp.1049-1054 DOI
Sakiyama et al. (2012) Jour. Geol. Soc. Japan, vol.118, Supplement, pp.1-20 DOI
Utada (2008) Jour. Geol. Soc. Japan, vol.114, no.5, pp.231-245 DOI