Geological Study of the Oiso District, Kanagawa Prefecture, South Kanto, Japan

Abstract

The stratigraphic succession of the rocks of the Oiso district is in descending order as follows : 10) Alluvium 9) Simobara beds K 8) Terrace deposits J₃ 7) Kanto volcanic ash, 6) Takao formation, 5) Kuroiwa conglomerate J₂∼J₃ 4) Tutizawa group J₁ 3) Ninomiya group I₂ 2) Miura group and Asigara group H₁ 1) Koraizan group F₁ base unknown 1) In the eastern part of Terugasaki, the Koraizan group unconformably underlies the Miura group., It may be correlated with the Hayama group in the Miura Peninsula., 2) The Nisikoiso formation is considered to be a fossil enclosure within the Oiso formation of the Miura group, as already suggested by S., IZIRI and Y., HUZITA., 3) The conglomerate at Kozu and Simosoga belongs to the Tutizawa group and not to the Ninomiya formation as formerly considered by Y., OTUKA., 4) A conformable relationship is ascertained between the Kanto volcanic ash and the Tutizawa group at several places in the area, while elsewhere the relation between the two is unconformable.,