Late Pliocene to Holocene movement of west coast area in Shika Town, central Noto Peninsula based on terrace, marine erosional feature, and fossils

Abstract

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.