Pre-Capitanian foraminiferal faunas are discriminated in 32 samples of limestone granules to cobbles of erratic limestone conglomerates in the Miharaiyama area, Yabu, Hyogo. These limestone fragments are enclosed densely or sparsely within conglomerates of arenaceous matrix different from those of calcareous argillaceous matrix having the Lepidolina kumaensis fauna. They are thought to have been derived from the Middle Formation of the Permian Maizuru Group. Based on these foraminiferal assemblages, approximate age is determined or estimated in 20 samples including the ashkirian two ones previously thought to have been originated from the basal conglomerate of the Lower Triassic Yakuno Group overlying unconformably the Middle Formation of the Maizuru Group. These 20 samples are divided into eight groups of different ages, late Visean, late Serpukhovian to early Bashkirian, late Bashkirian, middle Moscovian, early Gzhelian, late Asselian, Artinskian, and late Wordian.