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Older Haruna Volcanic Dykes

• Type locality: southern slope of Mount Kamongatake, Harunasan town, Takasaki city, Gunma prefecture
• Volcanic rocks
• Radial dikes
• middle Pleistocene
• Intruded in: Older Haruna Volcanic Products

• Sedimentary facies: Terrestrial
• Sedimentary facies: Dykes (ca. 30 sheets)
• Lithofacies: Tholeiite
• Lithofacies: Orthopyroxene clinopyroxene andesite

• Distribution (Length): ca. 800 m
• Distribution (Length, Tsuzuraiwa dike): ca. 500 m
• Distribution (Length, Kuroiwa dike): ca. 1,200 m or longer
• Distribution (Thickness): a few dozen - ca. 120 m

• Distribution: southern slope of Mount Kamongatake - Haruna shrine, Harunasan town, Takasaki city, Gunma pref.; Numao river, Higashiagatsuma city, Agatsuma county, Gunma pref.; Harunashirakawa river, Takasaki city, Gunma pref.

• Geshi and Takeuchi (2012) Geology of the Haruna San District, Quadrangle Series, Scale 1:50,000, Geological Survey of Japan, AIST, 79p. (in Japanese with English abstract 3p.)