Holocene Volcanic Ash Layer Derived from Hakusan Volcano Discovered in Kanazawa City, Central Japan

A volcanic ash layer was discovered in two sediment cores from the Kaga coastal plain, Ishikawa Prefecture. Three radiocarbon dates, obtained from wood and molluscan shells above and below the ash layer, indicate that its eruption occurred between ca. 8, 800 and ca. 8, 270yrs BP. From the age, distribution and mineral assemblage of the ash layer, it is considered to correlate with the Midagahara ash layer derived from Hakusan volcano, located 50km south of the Kaga coastal plain.