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Ajina Formation

• Coherent formation
• late Pliocene - early Pleistocene

• Lithofacies (Upper): Conglomerate, Gravel-bearing sandstone
• Lithofacies (Upper, Minor): Mudstone, Sandstone
• Lithofacies (Lower): Conglomerate, Mudstone, Lignite

• Thickness: ca. 40 m
• Distribution (East - West): 1. 5 km
• Distribution (South - North): 0. 5 km
• Lower limit: Unconformity (Kuga Group)

• Distribution: Ajina, Iwakuni city, Yamaguchi pref.
• Fossils (Plants): Metasequoia sp.
• Fossils (Pollen): Abies sp., Acer sp., Aesculus sp., Alnus sp., Araliaceae, Artemisia sp., Betula sp., Castanea sp., Carduoideae, Caryophyllaceae, Castanopsis sp., Celtis sp., Cichorioideae, Corpinus sp., Corylopsis sp., Corylus sp., Cryptomeria sp., Cyclobalanopsis sp., Cyperaceae, Ericaceae, Fagus sp., Gramineae, Ilex sp., Inaperturate pollen, Juglans sp., Labiatae, Larix sp., Lepidobalanus sp., Ligustrum sp., Monolete spore, Osmundaceae, Patrinia sp., Persicaria sp., Picea sp., Pinus sp., Plantago sp., Polypodiaceae, Potamogeton sp., Pseudotsuga sp., Pterocarya sp., Salix sp., Sciadopitys sp., Styrax sp., Symplocos sp., Taxodiaceae, Tilia sp., Tricolporate pollen, Trilete spore, Tsuga sieboldii, Typha sp., Ulmus sp., Umbelliferae, Zelkova sp.

• Higashimoto et al. (1986) Geology of the Otake District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 70p. (in Japanese with English abstract 6p.)