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Late Triassic radiolarians and conodonts from a chert pebble within the Lower Pleistocene Higashihigasa Formation of the Kazusa Group, Boso Peninsula, Japan

Late Triassic and conodonts from a chert pebble within the Lower Pleistocene Formation of the Kazusa of the Geological Survey of 73(3) p. 93–101, 1 Abstract: Radiolarians and conodonts were obtained from a chert pebble within the conglomerate of the Higashihigasa Formation, Kazusa Group, Boso Peninsula, Japan. Based on the occurrence of radiolarians ( Praemesosaturnalis sp. cf. P. heilongjiangensis ) and conodonts ( Mockina sp.), the chert pebble is considered to be Late Triassic (middle to late Norian) in age. This chert pebble is presumably derived from a Jurassic accretionary complex distributed in its provenance.