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Hekikai Formation Machida et al., 1962
- Type locality: west of Sanage station, Sanage town, Toyota city, Aichi prefecture
- Coherent formation
- early Pleistocene (MIS 5e or MIS 5e - 5a; ca. 32 ka, 14C; 90 - 80 ka, ESR)
- Upper: Pleistocene (95 - 70 ka)
- Lower: Pleistocene (120 - 95 ka)
- Correlation: upper Atsuta Formation, Handa Terrace Deposits, Miai Formation
- Sedimentary facies: Marine
- Sedimentary facies (Minor): Brackish
- Sedimentary facies: Bay
- Sedimentary facies (Top): Alluvial fan
- Sedimentary facies (Upper): Fore set of delta
- Sedimentary facies (Lower): Bottom set of delta
- Water temperature: Warm ocean current (Shellfishes)
- Depth of water: 5 - 15 m
- Lithofacies (Upper): Sands, Gravels
- Lithofacies (Upper, Minor): Interbedded sand and mud
- Lithofacies (Lower): Silt (Marine clay)
- Sedimentary structures: Parallel stratification
- Sedimentary structures (Minor): Cross stratification
------ Conformity, ~~~~~~ Unconformity, ~~~--- Local unconformity, '''/,, Interfingered, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown
- Distribution: Sanage town - Koshido town - Miyama town - Toyota town - Kamigo town - Miyoshi town, Toyota city, Aichi pref.; Shinonome - Anjo station, Anjo city, Aichi pref.; Yokohama, Takahama city, Aichi pref.; Nishio city, Aichi pref.; Toyoake city, Aichi pref.; Chikusa ward, Nagoya city, Aichi pref.
- Fossils: Shellfishes, Echinoids, Bryozoans, Barnacles, Decapods
- Fossils: Echinoids (Echinarachnius mirabilis, Temnopleurus toreumaticus), Bryozoan, Barnacles (Balanus sp.), Crabs, Tube worms (Serpula sp.)
- Fossils (Shellfishes): Abrina lunella, Acteon sp., Alvenius ojianus, Anisocorbula venusta, Anisodoma gouldi, Anomia chinensis, Arcopagia (Merisca) subtruncata, Atrina (Servatrina) pectinata, Babylonia japonica, Balcis sp., Barnea (Anchomasa) manilensis, Batillaria cumingii, Batillaria multiformis, Batillaria zonalis, Bedevina birileffi, Bittium sp., Borniopsias tsurumaru, Callista chinensis, Cerithideopsilla cingulata, Cerithiopsis sp., Chama reflexa, Chemnitzia sp., Chlamys farreri nipponensis, Chlamys (Mimachlamys) asperulata, Chlamys (Mimachlamys) nobilis, Chrysaltida (Besla) sp., Clathrofenella asperulata, Coelophysis succincta, Coelophysis (Sulcorelusa) minima, Collisella (Conoidacmea) heroldi, Conotalopia musiva, Corbicula japonica, Crassatellites nanus, Crassostrea pestigris, Cryptomya busoensis, Cuspeulima ozawai, Cyclodicama cumingii, Cylichnatys ngusia, Daphnella sp., Dentalium (Paradentalium) octangulatum, Depressiscala aurita, Dosinia (Dosinella) penicillata, Dosinia (Phacosoma) japonica, Dosinia (Phacosoma) troscheli, Dostia violaceea, Doxander vittatus japonicus, Eufenella pupoides, Eufenella rufocincta, Eunaticina papilla, Fabulina sp., Fulvia mutica, Glycymeris vestita, Granuliterebra bathyraphe, Guraleus hiradoensis, Hiatella flaccida, Hinia festiva, Indomitrella yabei, Kellia aff. subelliptica, Luiraria arcuata, Lunella coronata, Mactra chinensis, Macroschisma sp., Macoma tokyoensis, Mactra veneriformis, Martesia striata, Melliteryx puncticulata flexuosa, Meretina tokunagai, Microcirce dilecta, Mitrella bicincta, Mitrella tenuis, Montellum hakodatense, Musculus (Musculista) senhousia, Mya (Arenomya) arenria conogai, Mytilus sp., Neverita (Glossaulax) hosoyai, Niotha livescens, Nipponarca bistrigata, Nipponomysella oblongata, Nipponomysella subtruncata, Odostomia sp., Ostrea denselamellosa, Panope japonica, Paphia (Paratapes) undulata, Paphia vernicosa, Paramorumula sp., Pecten (notovola) albicans, Philbertia leukarti, Pictoneritina oualaniensis, Pillucina pisidium, Pillucina (Wallucina) lamyi, Pitar (pitarina) sulfureum, Platomysia rugata, Proclava kochi, Prototharca jedoensis, Pseudoetrema fortilirata, Raeta (Raetellops) rostralis, Rapana thomosiana, Reticunassa japonica, Rhizorus eburneus, Rhizorus radiolus, Ringicula (Ringiculina) doliaris, Scaliola glareasa, Scapharea subcrenata, Semelangulus tokubeii, Semele cardioformis, Sinusicola yendoi, Solecurtus divaricatus, Solidicorbula erythrodon, Standella capillacea, Starkeyna sobrina, Striarca (Calactella) symmetrica, Striarca (Didimarca) tenebrica, Sydophera spengleriana, Tapes (Amygdala) philippinarum, Tectonatica janthostomoides, Tomopleura nivea, Trapezium (Neotrpezium) liratum, Triphora sp., Trisidos tortuosa kiyonoi, Umbonium (Suchium) moniliferum, Vasticardium arenicola, Venatomya truncata, Veremolpa micra, Viriola cfr. corrugata, Volachlamys hirasei awajiensis, Zafra pumilia
- Tephra: K-Tz
- Nakashima et al. (2021) Geology of the Toyota District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 91p. (in Japanese with English abstract 4p.)
- Makinouchi et al. (2011) Jour. Geol. Soc. Japan, vol.117, no.2, pp.79-94 DOI
- Yoshida and Ozaki (1986) Geology of the Handa District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 98p. (in Japanese with English abstract 4p.)
- Sakamoto et al. (1986) Geology of the Nagoya-Nambu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 55p. (in Japanese with English abstract 3p.)