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Hata Vent Breccia

• Type locality: Ninokura, Hatazawa, Yamakita city, Ashigarakami county, Kanagawa prefecture
• Volcanic rocks
• Explosion crater
• early Pleistocene (1.33 - 0.89 Ma, K-Ar)
• Intruded in: Hata Formation

• Sedimentary facies: Vent-fill breccia
• Lithofacies: Poorly-sorted hornblende andesite breccia with a matrix of crushed hornblende andesite

• Distribution (East and west): 1.3 km
• Distribution (North and south): 0.8 km

• Distribution: Ninokura, Hatazawa, Yamakita city, Ashigarakami county, Kanagawa pref.

• Odawara et al. (2011) Jour. Geol. Soc. Japan, vol.117, Supplement, pp.135-152 DOI