KODA, Y. & KOIKE, W. & ANDO, H. & UYENO, T. & USUI, K. (2007)
Carcharodon megalodon tooth set collected from calcareous concretions in the Miocene Kokozura Formation, Takaku Group, Kitaibaraki city, Ibaraki Prefecture, Japan. Palaeontological Society of Japan, 81: 1–2