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Gumizaki Formation

• Type locality: Gumizaki town, Satsumasendai city, Kagoshima prefecture
• Coherent formation
• Early Cretaceous, Aptian - Albian (Bivalves, Radiolarians)
• Correlation: Lower Hinagu Formation (= Imaizumigawa Formation)

• Sedimentary facies: Marine
• Depth of water: Shallow marine
• Lithofacies: Mudstone, Sandstone, Conglomerate

• Distribution (East-West): ca. 1.7 km
• Distribution (South-North): ca. 1.0 km

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

• Distribution: Gumizaki town, Satsumasendai city, Kagoshima pref.
• Fossils: Bivalves (Pterotrigonia hokkaidoana), Ammonoids (Cheloniceras? sp.)
• Fossils (Radiolarians): Dictyomitra communis, Dictyomitra excellens, Dictyomitra sp., Thanarla lacrimula, Thanarla conica, Thanarla brouweri, Thanarla pseudodecora, Thanarla pulchra, Thanarla pacifica, Thanarla sp., Pseudodictyomitra carpatica, Pseudodictyomitra hornatissima, Pseudodictyomitra lodogaensis, Pseudodictyomitra sp., Xitus sp., Xitus elegans, Crolanum puga, Napora? sp., Stichomitra mediocris, Stichomitra simplex, Stichomitra aff. japonica, Stichomitra sp., Pseudoeucyrtis hanni, Cryptamphorella clivosa, Cryptamphorella? sp., Gongylothorax verbeeki, Turbocapsula fugitiva, Holocryptocanium japonicum, Hiscocapsa verbeeki, Hiscocapsa grutterinki, Hiscocapsa? sp., Nassellaria gen. et sp. indet, Praeconocaryomma sp., Dactyliosphaera sp., Godia decora, Godia nodocentrum, Godia concava, Godia sp., Patellula sp.

• Ishida et al. (2008) Jour. Geol. Soc. Japan, vol.114, no.10, pp.532-535 DOI