Correlation of the Azuki Volcanic Ash of the Osaka Group and the Ku6C Volcanic Ash of the Kazusa Group to the Imaichi pyroclastic-flow deposit in central Kyushu, Japan. A co-ignimbrite ash erupted from Shishimuta caldera.

Kamata, H., Danhara, T., Yamashita, T., Hoshizumi, H., Hayashida, A., & Takemura, K. (1994). Correlation of the Azuki Volcanic Ash of the Osaka Group and the Ku6C Volcanic Ash of the Kazusa Group to the Imaichi pyroclastic-flow deposit in central Kyushu, Japan. A co-ignimbrite ash erupted from Shishimuta caldera. The Journal of the Geological Society of Japan, 100(11), 848–866. https://doi.org/10.5575/geosoc.100.848