Recognition of the marine oxygen isotope stage 10 fluvial terrace in drainage of the Aga River, southern Aizu area, Fukushima Prefecture

Abstract

     Well-developed fluvial terraces are distributed in drainage of the Aga River, southern Aizu area, Fukushima Prefecture. This study classified the higher terraces into H1 Surface(H1), H2 Surface(H2) and H3 Surface(H3) based on stratigraphy, which is A₂Pm originated from Hida Mountains, TyP and Tsurugaike Debris Avalanche Deposit(Tsurugaike-DAD) in descending order.
     H1 consists of subrounded gravel bed covered with Tsurugaike-DAD. H2 and H3 are strath terraces of Tsurugaike-DAD. H2 is covered with the loam comprising TyP, whereas TyP does not cover H3, which emerged before A₂Pm fell.
     Therefore, H1 and H2 formed before MIS11(MIS: marine oxygen isotope stage) and H3 emerged during MIS10.