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Hira Granite Yoshizawa et al., 1965

• Plutonic rocks
• Ring complex of caldera associated with the eruption of Koto Rhyolites
• Late Cretaceous (72.8, 72.3 Ma, K-Ar; 78.2 Ma, Rb-Sr)
• Intruded by: Granite porphyry dike, Rhyolitic dacite dike
• Intruded in: Tamba Belt, Koto Rhyolites

• Lithofacies: Ilmenite series
• Lithofacies: Biotite granite
• Lithofacies: Granite porphyry dike, Rhyolitic dacite dike

• Distribution (Length): ca. 13 km
• Distribution (Width): 4 - 5 km
• Upper limit: Abut unconformity (Kobiwako Group)

------ Transitional, ~~~~~~ Intrusive, :::::: Fault, /--/-- Thrust, +__+__ Ground surface, ?--?-- Unknown

• Distribution: Yatsubuchi fall - Ukawa - Katsuno, Takashima city, Shiga pref.; Yobai fall - Mount Domandake - Mount Suribachiyama - Mount Shakadake - Mount Hiradake, Otsu city, Shiga pref.

• Kiji et al. (2019) Jour. Geol. Soc. Japan, vol.125, no.1, pp.107-118 DOI
• Wakita et al. (2013) Geology of the Kyoto-Tonambu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 124p. (in Japanese with English abstract 3p.)
• Collaborative Research Group for the Granites around Lake Biwa (2008) Jour. Geol. Soc. Japan, vol.114, no.2, pp.53-69 DOI
• Kimura et al. (2001) Geology of the Kitakomatsu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 102p. (in Japanese with English abstract 5p.)
• Saito and Sawada (2000) Geology of the Yokoyama District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 126p. (in Japanese with English abstract 5p.)
• Ishida et al. (1984) Geology of the Hikone-Seibu District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, 121p. (in Japanese with English abstract 6p.)