[ Top ] [ Japanese ]

Kioroshi Formation (Makiyama, 1931) Tokuhashi and Endo, 1984

Invalid synonym: Miwa Formation, Upper Narita Formation, Urawa Formation

• Type locality: Kioroshi, Inzai city, Chiba prefecture
• Coherent formation
• Paleo-Tokyo bay fill deposit
• A cycle of marine transgression - marine regression
• Pleistocene (MIS 5.5)
• Correlation (Upper): Tokyo Formation
• Correlation (Lower): Setagaya Formation

• Sedimentary facies: Marine
• Sedimentary facies: Storm-dominated seashore - Shoreface
• Sedimentary facies (East, Upper): Inner bay, Lagoon-fill deposits of barrier island system during marine regression stage
• Sedimentary facies (East, Lower): Valley-fill sediments of calm bay, Braided river, Meandering river
• Sedimentary facies (West): Inner bay, Lower shoreface, Upper shoreface, Foreshore, Backshore, Lagoon, Tidal river mouth, Mudflat, Salt marsh
• Sedimentary facies (West, Basal): River mouth, Ravinement erosion surface
• Water temperature: Warm ocean current
• Lithofacies (East, Upper): Mud, Sandy mud, Sands
• Lithofacies (East, Lower): Interbedded sands and mud, Sandy mud, Muddy sands
• Lithofacies (West, Upper): Interbedded sands and mud
• Lithofacies (West, Lower): Mud
• Lithofacies (West, Basal): Sands, Gravels
• Sedimentary structures: Parallel stratification, Trough cross-stratification, Hummocky cross-stratification, Pipe rocks, Wave ripples
• Paleocurrent: Northwest

• Thickness: 3 - 35 m
• Thickness (Upper): 5.7 - 13.4 m
• Thickness (Lower): 4 - 17 m
• Upper limit: Conformity or Unconformity (Joso Formation), Unconformity (Omiya Formation)
• Lower limit: Unconformity (Yokota Formation, Kiyokawa Formation, Kongochi Formation, Kamiizumi Formation, Yabu Formation)

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

• Distribution: Inashiki terrace, Kashima terrace, Namegata terrace, Higashi-Ibaraki terrace, Tsukuba terrace, Lake Hinuma, Naka terrace, Ibaraki pref.
• Distribution: Kioroshi, Inzai city, Chiba pref.; Izushima - Jozai, Kisarazu city, Chiba pref.; Toyonari - Iriyamazu - Osone - Odappe - Kongochi, Ichihara city, Chiba pref.; Kubota - Shimomiyata, Sodegaura city, Chiba pref.; Isagoda - Kayano, Oamishirasato city, Chiba pref.; Kamimisho, Nagara city, Chosei county, Chiba pref.; Osawa, Mobara city, Chiba pref.; Ogoyama, Kasama city, Ibaraki pref.; Hongo - Kenjaku, Ibaraki city, Higashiibaraki county, Ibaraki pref.; Onuki village, Oarai city, Higashiibaraki county, Ibaraki pref.; Kamihataki, Hokota city, Ibaraki pref.; Ishigami, Namegata city, Ibaraki pref.
• Fossils: Echinoids, Trace fossils (Macaronichnus segregatis, Rosselia socialis), Plant roots, Tree trunks
• Fossils (Shellfishes): Actaeophyramis eximia, Acteocina sp., Anadara (Hataiarca) subcrenata, Anadara (Scapharca) satowi, Anadara (Tegillarca) granosa bisenensis, Anisocorbula venusta, Antalis weinkauffi, Arcopagina sp., Babylonia japonica, Babylonia japonica, Batillarina zonalis, Cadella delta, Callista chinensis, Cerithideopsis (Cerithideopsilla) djadjariensi, Chlamys farreri nipponensis, Chlamys (Chlamys) nipponica, Clinocardium buellowi, Corbicula (Corbicula) japonica, Crassostrea gigas, Crepidula gravispinosus, Cyclosunetta menstrualis, Didimacar tenebrica, Dosinia (Phacosoma) japonica, Epitonium sp., Eulima maria, Fabulina (Fabulina) nitidula, Fulvia mutica, Glossaulax didyma, Glycymeris imperialis, Glycymeris vestita, Glycymeris yessoensis, Gomphina melanegis, Heteromacoma irus, Latona kiusiuensis, Lunalicardia sp., Macoma incongrua, Macoma (Macoma) tokyoensis, Mactra chinensis, Mactra sulcataria, Megangulus venulosa, Mitrella (Indomitrella) lischkei, Monia umbonata, Mya sp., Neverita (Glossaulax) didyma, Nipponarca bistrigata, Oblimopa multistriata, Olivella fulgurata, Ostrea denselamellosa, Pecten albicans, Petricolirus aequistriatus, Phacosoma japonicum, Phlyctiderma japonicum, Placamen tiara, Profundinassa babylonica, Protothaca schenki, Raeta (Raetellops) yokohamaensis, Raetellops pullchellus, Rapana venosa, Reticunassa festiva, Reticunassa japonica, Ringicula (Ringiculina) doliaris, Ruditapes philippinarum, Saxidomus purpurata, Scapharaca kagoshimensis, Siliqua pulchella, Siphonalia fusoides, Solecurtus divaricatus, Solen strilctus, Solidicorbula erythrodou, Striarca (Didimaraca) tenebrica, Tapes variegata, Trapezium (Neotrapezium) japonica, Umbonium (Suchium) costatum, Venemolpa sp.
• Fossils (Toyonari, Shellfishes): Aloidis venusta, Anadara inflata, Arcopagia serricostata, Barbatia yokoyamai, Batillaria zonalis, Brachytoma jeffreysi, Callista sinensis, Calliostoma shinagawense, Cancellaria spengleriana, Cardium multicum, Chlamys farreri nipponensis, Codakia contraria, Dentalium octangulatum, Dentalium weinkouffi, Dentalium yamakawai, Dosinia angulosa, Dosinia japonica, Fusinus perplexus, Joannisiella cumingi, Limopsis multistriata, Lioconcha gordonis, Macoma tokyoensis, Meretrix meretrix, Nassarius japonicus, Obtortio rufocineta, Panope japonica, Paphia euglypta, Pecten laqueotus, Polinices didyma, Raeta ykohamensis, Ringicula arctata, Siphonalia fusoides, Tellina vestalioides, Umbonium moniliferum, Venus tiara, Zozia abbreviata
• Fossils (West): Plant fragments
• Fossils (West, Shellfishes): Anisocorbula venusta, Assiminia japonica, Babylonia japonica, Callista chinensis, Callista chinensis, Cardella delta, Carditella toneana, Cerithidea djadjariensis, Corbicula japonica, Crassostrea gigas, Cryptomya busoensis, Cyclosunetta menstrualis, Dosinia troscheli, Fulvia mutica, Glycymeris albolineata, Glycymeris vestita, Gomphina neastartoides, Homalopoma amussitatum, Limaria hakodatensis, Lirularia pygmaea, Macoma sectior, Mactra chinensis, Mactra crossei, Meretrix lamarckii, Microgaza planorboides, Mitrella bicincta, Musculus senhausia, Olivella japonica, Panopea japonica, Pecten albicans, Phacosoma japonicum, Potamocorbula sp., Protothaca jedoensis, Raetellops pulcela, Ringicula doliaris, Ruditapes philippinarum, Saxidomus purpuratus, Scapharaca kagoshimaensis, Scapharca subcrenata, Solen grandis, Tapes variegata, Tentidonax kiusiuensis, Tresus keenae, Umbonium giganteum, Varicorbula yokoyamai
• Fossils (West, Foraminifera): Ammonia japonica, Buccella frigida, Buccella makiyamae, Elphidium advemum, Elphidium somaense, Pararotalia minuta, Pararotalia nipponica, Pseudononion japonica, Rosalina vilardevoana
• Fossils (West, Diatoms): Actinoptychus spp., Aulacoseira ambigua, Aulacoseira distans, Aulacoseira granulata, Aulacoseira italica, Cyclotella rhomboideo-ellipica, Cyclotella striata, Cyclotella stylorum, Cymbella spp., Diploneis smithii, Fragilaria brevistriata, Gomphonema spp., Luticola spp., Paralia sulcata, Pseudopodosira kosugii, Skeletonema costatum, Thalassiosira spp., Tryblionella granulata
• Fossils (West, Pollen): Abies sp., Alnus sp., Carpinus sp., Cryptomeria sp., Fagus sp., Hemiptelea sp., Juglans sp., Ostrya sp., Picea sp., Pinus sp., Tsuga sp.
• Fossils (Upper, Trace fossils): Macaronichnus segregatis
• Fossils (Kisarazu city, Shellfishes): Alvenius ojianus, Callista chinensis, Calyptraea yokoyamai, Clathrofenella reticulata, Crassostrea gigas, Cryptomya busoensis, Cycladicama cumingi, Dosinella angulosa, Eufenella rufocincta, Fulvia mutica, Oblimopa multistriata, Odostomia spp., Orinella pulchella, Paracingulina triarata, Pecten albicans, Pilluxina yamakawai, Placamen tiara, Reticunassa japonica, Retusa minima, Ringicula doliaris, Saccella confusa, Scapharaca broughtonii, Siphonalia fusoides, Turbonilla spp., Wallucina striata
• Fossils (Kisarazu city, Foraminifera): Ammonia beccarii, Ammonia japonica, Buccella frigida, Elphidium advenum, Elphidium advenum depressa, Elphidium clavatum, Elphidium subincertum, Pseudorotalia gaimardii, Quinquelcoculina contorta, Quinquelcoculina vulgaris, Rosalina vilardeboana, Triloculiina trigonula
• Fossils (Kisarazu city, Ostracods): Aurila munechikai, Buntonia hanaii, Cornucoquimba tosaensis, Cytheromorpha acupunctata, Hemicytherura cuneata, Loxoconcha (Loxoconcha) laeta, Neomonoceratina microreticulata, Nipponocythere bicarina, Ruggieria (Keijella) bisanensis, Spinileberis quadriaculeata, Xestoleberis hanaii
• Fossils (Kisarazu city, Diatoms): Amphora ovalis var. libyca, Coscinodiscus spp., Cyclotella stylorum, Cymbella turgidula, Cymbella tumida, Diploneis elliptica, Epithemia adoata, Eunotia praerupta var. bidens, Frustulia vulgaris, Gomphonema parvulum, Grammatophora macilenta, Hantzschina amphioxys, Melosira sulcata, Melosira varians, Navicula cryptocephala, Navicula cuspidata, Nitzschia gracilis, Pinnularia gibba, Pinnularia microstauron, Pinnularia viridis, Rhaphoneis surirella, Rhopalodia gibba, Rhopalodia gibberula, Stauroneis phoenicenteron, Synedra ulnaThalassionema nitzschioides, Thalassiosira excentrica, Thalassiosira lineata
• Tephra: Ag-MzP8, Ag-MzP9, Ag-MzP10, Hk-KlP, Ko1, Ko2, Ko3, Ko4

• Sakata et al. (2018) Jour. Geol. Soc. Japan, vol.124, no.5, pp.331-346 DOI
• Nanayama et al. (2016) Geology of the Mobara District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 101p. (in Japanese with English abstract 4p.)
• Naya and Yasuhara (2014) Geology of the Konosu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 82p. (in Japanese with English abstract 3p.)
• Ooi et al. (2013) Jour. Geol. Soc. Japan, vol.119, no.7, pp.488-505 DOI
• Ooi and Yokoyama (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.103-120 DOI
• Nakazawa and Tanabe (2011) Geology of the Noda District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 72p. (in Japanese with English abstract 3p.)
• Nakazawa et al. (2009) Jour. Geol. Soc. Japan, vol.115, no.2, pp.49-63 DOI
• Nakajima and Watanabe (2005) Geology of the Futtsu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 102p. (in Japanese with English abstract 8p.)
• Komatsubara et al. (2004) Geology of the Kisarazu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 64p. (in Japanese with English abstract 3p.)
• Nakazawa and Endo (2002) Geology of the Omiya District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 41p. (in Japanese with English abstract 3p.)
• Miyazaki et al. (1996) Geology of the Makabe District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 103p. (in Japanese with English abstract 4p.)
• Tokuhashi and Endo (1984) Geology of the Anesaki District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 136p. (in Japanese with English abstract 6p.)