[ Top ] [ Japanese ]

Karasawagawa Formation

• Coherent formation
• Oceanic arc of Paleo-Izu-Bonin arc
• Middle Miocene (15.8 - 13.5 Ma, Calcareous nannofossils)

• Sedimentary facies: Marine
• Metamorphic facies: Prehnite-Pumpellyite
• Lithofacies: Subaqueous volcaniclastics, Subaqueous lavas
• Lithofacies: Basaltic - andesitic hyaloclastite, Epiclastic debrite and turbidite
• Lithofacies (Minor): Basaltic - andesitic lavas, Pillow lavas

• Thickness: 900 - 2,200 m
• Upper limit: Conformity
• Lower limit: Conformity

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

• Distribution: Tanzawa mountains, Kanagawa pref.
• Fossils: Corals, Nautilus, Calcareous algae, Foraminifera

• Ishikawa et al. (2016) Jour. Geol. Soc. Japan, vol.122, no.7, pp.291-304, DOI
• Matsubara and Amano (2010) Jour. Geol. Soc. Japan, vol.116, no.3, pp.134-150 DOI