Paleogeography and geological evolution since the Late Pliocene in and around the Horonobe area, northern Hokkaido

Niizato, Tadafumi  ; Funaki, Hironori ; Yasue, Kenichi

The tectonic framework in the northern part of Hokkaido has been controlled by interrelationship between the Amurian Plate and Okhotsk Plate since the Late Pliocene. The developments of the geological structure of fold-and-thrust belt with westward vergence and migration of depositional axis from east to west have been progressed in the framework since Late Pliocene. On the basis of distribution of fossil-periglacial phenomena and its origin, northern part of Hokkaido was located in the southern margin of the continuous permafrost zone or the northern margin of the discontinuous zone during the Last Glacial Maximum. This field trip includes the minor deformation structures and sedimentary facies developed in the Tertiary to Quaternary sedimentary formations, aeolian deposits from MIS7 to MIS5e, periglacial deposits in the LGM. It also includes the periglacial landform distributed in the Horonobe area.