1:45 PM - 3:15 PM [O03-P35] Evidence for the formation of an ancient caldera lake system estimated from analyzing tuff samples from Hyogo, Japan *Haruka KAWACHI, *Natsuka NISHIDA, *Sayaka YAMAMOTO, Akiho SENBA, Noriyuki TSUJI, Natsumi HASEGAWA, Yuma FUKUMORI
