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Nekoya Formation

• Coherent formation
• Pleistocene
• Correlation: Mine Bed, lower Hijikata Formation

• Sedimentary facies: Shallow marine
• Sedimentary facies: near the river mouth of sea which deepens suddenly
• Water temperature: Almost same as Suruga bay
• Depth of water: ca. 150 m
• Lithofacies (Upper): Interbedded gravels and silt
• Lithofacies (Middle): Silt
• Lithofacies (Lower): Gravels
• Sedimentary structures (Middle): Slump structure, Imbricate structure

• Thickness: 200 - 300 m
• Thickness (Upper): 50 m or thicker
• Thickness (Lower): 20 - 30 m
• Upper limit: Unconformity (Kunozan Gravel Bed)

• Distribution: Udo hills, Suruga ward - Shimizu ward, Shizuoka city, Shizuoka pref.; Ago - Furuyado, Suruga wrd, Shizuoka city, Shizuoka pref.
• Fossils Sharks (Teeth), Echinoids, Solitary corals (Fulabelum sp.)
• Fossils (Shellfishes): Acila divaricata, Aequipecten vesiculosus, Amalthea conica, Anomia sp., Babylonia japonica, Bathytoma lühdorfi, Batillaria multiformis, Crassostrea gigas, Dentalium octangulatum, Fulgoraria concinna, glycymeris rotunda, Limopsis tajimae, Mactra veneriformis, Nassaria magnifica, Nassarius caelatus, Ostrea sp., Paphia schnelliana, Pecten sp., Pseudoliotia micans, Pyrene varians, Siphonalia modificata, Tritia japonica, Umbonium moniliferum, Venerupis variegata, Venus foveolata
• Fossils (Foraminifera): Globigerina angustiumbilicata, Globigerinoides tenellus, Globorotalia acostaensis, Globorotalia truncatrinoides
• Fossils (Calcareous nannofossils): Emiltiania huxleyi, Gephyrocapsa oceanica
• Tephra: Ng-1

• Sugiyama and Shimokawa (1990) Geology of the Shimizu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 8p.)
• Sugiyama et al. (1982) Geology of the Shizuoka District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 82p. (in Japanese with English abstract 9p.)