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Koka Formation
- Coherent formation
- Pliocene (2.8 - 2.6 Ma)
- Sedimentary facies: Terrestrial
- Sedimentary facies: Wide and deep lake (Diatoms), Fluvial
- Lithofacies (Main): Clay
- Lithofacies (Minor): Sand, Interbedded clay and sand
- Upper limit: Conformity
- Lower limit: Conformity
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Yasu river, Yoshinaga, Konan city, Shiga pref.; Kosaji, Koka village, Koka city, Shiga pref.
- Fossils (Plants): Abies sp., Alnus sp., Carex sp., Cathaya sp., Chamaecyparis obtuse, Chamaecyparis pisifera, Cornus sp., Cunninghamia sp., Cyclocarya sp., Dichocarpum sp., Eurya japonica, Fagus microcarpa, Ficus cf. nipponica, Fraxinus sp., Glyptostrobus sp., Lapsana sp., Metasequoia sp., Picea sp., Polygonum sp., Pseudotsuga sp., Salix sp., Sciadopitys sp., Scirpus sp., Sequoia sp., Thuja standishii, Tsuga sp.
- Fossils: Diatoms (Melosira solida), Elephants (Footprints), Deers (Footprints)
- Tepha: Kosaji Tuff Bed
- Satoguchi et al. (2012) Jour. Geol. Soc. Japan, vol.118, Supplement, pp.70-78 DOI