Fusulinaceans Contained in Pebbles of the Intraformational Conglomerate of the Kanyo Formation, North of Itsukaichi, Southern Kwanto Mountains, Japan

Abstract

The Kanyo Formation, distributed in the southern Kwanto Mountains, is the uppermost lithostratigraphic unit of the Middle Carboniferous to Lower Jurassic Nishitama Group. In north of Itsukaichi, this formation intercalates a remarkable intraformational conglomerate containing clasts of pebble- to boulder-size acidic to intermediate igneous rocks and prolific sedimentary rocks. The limestone clasts yield Moscovian to early Artinskian foraminifers, mostly of fusulinaceans. This paper describes the stratigraphy of this formation in north of Itsukaichi and two fusulinaceans: Biwaella omiensis Morikawa and Isomi and Biwaella sp. among the 52 listed foraminiferal species.