Earth Science (Chikyu Kagaku)
Online ISSN : 2189-7212
Print ISSN : 0366-6611
Volume 73 , Issue 4
Showing 1-2 articles out of 2 articles from the selected issue
Research Article
  • Shiro ISHIDA, Atsuo KOTAKI, Natsumi ITOMOTO
    Type: research-article
    2019 Volume 73 Issue 4 Pages 195-204
    Published: October 25, 2019
    Released: June 04, 2020
    JOURNALS FREE ACCESS

    In northern Kyoto Prefecture, marine terraces are distributed over the coast of the Sea of Japan. Middle terraces are distributed widely around there and their terrace surfaces are well-preserved. Their former shoreline altitudes have been used to examine the crustal movements by geomorphologists. The marine sediments of the middle terraces are overlain by the Daisen Kurayoshi Pumice (DKP), and it is considered the middle terrace deposits were formed in the last interglacial stage.

    We examined middle terrace deposits using sedimentary facies analysis and particle size analysis. Successions of their terrace deposits consist of foreshore gavel, shoreface, foreshore, backshore and dune sand and loess in ascending order. Thus we could estimate depositional environments of terrace deposits. In this paper we demonstrate the formation process of marine terrace in a sea level change at the last interglacial age.

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  • Research Group of active fault in the western coast, Noto Peninsula
    Type: research-article
    2019 Volume 73 Issue 4 Pages 205-221
    Published: October 25, 2019
    Released: June 04, 2020
    JOURNALS FREE ACCESS

    The crustal movement from late Pleistocene to Holocene was investigated in the western coastal area in Shika Town, central Noto Peninsula. Middle terraces are distributed in this coastal area. The sedimentary facies of these terrace deposits were observed and described, and further the altitude of terrace surface was examined. As a result, it became clear that marine sediments are continuously distributed north from Fukuura port in Shika Town. In addition, the altitude is gradually higher from Akasumi in the south toward the Urukami in the north, and the altitude is lowered on the right bank of the Togi River. This suggests that the fault along the Togi River has been active since 100 〜120 thousand years ago. Furthermore, the wave-cut notch carved on the sea cliff and emerged fossil of tubes made by Pomatoleios kraussii in this rocky coast. Discontinuous altitude of wave-cut notches and fossil assemblages shows intermittent uplift motion in the Holocene. However, the fault movement caused this movements never clear from this research.

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