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頭川 砂岩層 (望月, 1928) 角ほか, 1989

ずかわ

Zukawa Sandstone Member (Mochizuki, 1928) Sumi et al., 1989

別名 (無効): 頭川層

• 模式地: 富山県 高岡市 頭川 (ずかわ)
• 整然層
• 前期 - 後期 鮮新世
• 指交: 大桑 砂岩層
• 対比: 薮田 シルト岩層, 十二町層

• 堆積相: 海
• 水深 (上部): 上部浅海
• 水深 (下部): 下部浅海
• 岩相 (上部): 礫を含む砂岩
• 岩相 (上部, 少量): 礫岩
• 岩相 (下部): 石灰質砂岩
• 堆積構造: 平行葉理, 斜交層理
• 古流向: 北東 - 東へ

• 層厚: 約150 - 250 m以上
• 上部と下部は漸移, 五十辺2火山灰層 (IK2)の基底が境界
• 上限: 不整合 (板屋 砂岩シルト岩層)
• 下限: 不整合 (谷内層, 音川層)

------ 整合, ~~~~~~ 不整合, ~~~--- 部分不整合, '''/,, 指交, :::::: 断層, /--/-- 衝上断層, +__+__ 地表, ?--?-- 不明

• 分布: 富山県 高岡市 頭川 (ずかわ) - 五十辺 (いからべ), 富山県 小矢部市 法楽寺 (ほうらくじ)
• 化石 (石灰質ナンノ化石): Braarudosphaera bigelowii, Coccolithus pelagicus, Discolithina japonica, Gephyrocapsa spp., Helicosphaera carteri, Helicosphaera hyalina, Helicosphaera sellii, Rhabdosphaera stylifera, Reticulofenestra sp., R. spp., Sphenolithus abies, Syracosphaera pulchra
• 化石 (頭川 動物群, 貝): Acesta goliath, Acila (Truncacila) insignis, Anadara (Andara) cf. amicula, Anisocorbula venusta, Anomia chinensis, Antiplanes contraria, Arca boucardi, Astarte hakodatensis, Astarte (Tridonta) alaskaensis, Astarte (Tridonta) borealis, Bittium sp., Boreoscala greenlandica, Buccinum sp., Cadella luburica, Callista (Ezocallista) brevisiphonata, Callithaca adamsi, Calyptraea yokoyamai, Cancellaria (Sydaphera) spengleriana, Cardiomya gouldianaCetoconcha sp., Chlamys (Chlamys) cosibensis, Chlamys (Chlamys) farreri, Chlamys (Leochlamys) tanassevitschi, Chlamys (Swiftopecten) swiftii, Clinocardium fastosum, Crassatella (Indocrassatella) oblongata, Crassostrea sp., Crenella yokoyamai, Crithe cotamago, Cryptobranchia kuragiensis, Cryptonatica clausa, Cryptonatica janthostoma, Cryptonatic ajanthostomoides, Cycladicama cumingii, Cyclocardia ferruginea, Cymatiidae gen. et sp. indet, Enida japonica, Ennucula niponica, Entodesma sp., Euspira sp., Ezocallista brevisiphonata, Felaniella ohtai, Felaniella usta, Ginebis crumpii, Glycymeris (Glycymeris) nipponica, Glycymeris (Glycymeris) yessoensis, Glycymeris (Tucetilla) pilsbryi, Homalopoma amussitatum, Irus? sp., Lepeta caeca pacifica, Limatula (stabilima) japonica, Limatula vladivostokensis, Lima vulgatula, Limopsis (Crenulilimopsis) cretata, Limopsis (Enpleconia) cumingi, Limopsis oblonga, Limopsis tokaiensis, Liocyma fluctuosa, Lunatia pila, Macoma (Macoma) calcarea, Macoma (Macoma) contabulata, Macoma (Macoma) incongrua, Macoma (Macoma) nipponica, Mactridae gen. et sp. indet, Megacardita ferruginosa, Megacrenella columbiana, Mercenaria stimpsoni, Miodontiscus nakamurai, Miodontiscus prolongatas nakamurai, Mitrella (Mitrella) bicincta, Mizuhopecten poculum, Mizuhopecten tokyoensis hokurikuensis, Mizuhopecten yessoensis yokoyamae, Modiolus difficilis, Monia macroschisma, Monia umbonata, Myadora japonica, Mya (Mya) cuneiformis, Mytilus sp., Nassarius (Zeuxis) caelatus, Naticidae gen. et sp. indet, Nemocardium samarangae, Neptunea (Golikovia) cf. nikkoensis, Neptunea (Neptunea) insularis, Neverita (Glossaulax) didyma, Nipponoacmaea sp., Niveotectura pallida, Nuculana (Nuculana) pernula, Nuculana (Thestyleda) yokoyamai, Ocinebrellus sp., Olivella spretoides, Ophiodermella kakumensis, Ophiodermella ogurana, Ostrea sp., Panomya nipponica, Panopea japonica, Pecten (Notovola) albicans, Peronidia zyonoensis, Polynemamussium intuscostatum, Portlandia (Megayoldia) thraciaeformis, Profulvia kurodai, Pteropurpura sp., Puncturella nobilis, Reticunassa sp., Retusa (Coleophysis) succincta, Ringicula (Ringiculina) yokoyamai, Rissolina (Rissolina) costulata, Searlesia japonica, Securella sp., Serpulorbis cf. medusae, Solen sp., Spisula (Mactromeris) grayana, Spisula (Mactromeris) vogi, Suavodrilla declivis, Sulcerato callosa, Swiftopecten swiftii, Tachyrhychus onoyamai, Tachyrhynchus venustellus, Thracia kakumana, Thracia kamayasikiensis, Thyasiratokunagai, Tridonta alaskensis, Tridonta borealis, Trophon (Boreotrophon) candelabrum, Turcica coreensis, Turritella (Neohaustator) saishuensis etigoensis, Turritella (Neohaustator) saishuensis motidukii, Turritella (Neohaustator) saishuensis saishuensis, Umbonium (Suchium) akitanum, Venericardia ferruginea orbicularis, Venericardia myogadaniensis, Venericarida (Megayoldia) ommaensis, Yabepecten tokunagai, Yoldia (Cnesterium) notabilis
• テフラ: 雫谷火山灰層 (しずくだに, SZp = T3), 五十辺1火山灰層 (いからべ, IK1), 五十辺2火山灰層 (いからべ, IK2)

• 天野ほか (2012) 地質学雑誌, vol.118, no.12, pp.810-822 DOI
• 角ほか (1989) 石動地域の地質, 地域地質研究報告 (5万分の1地質図幅), 地質調査所, 118p.