Late Pleistocene buried humic soils within a tephra-soil sequence near Unzen volcano, Kyushu, Japan

Enhancing tephrochronology and its application (INTREPID Project): Hiroshi Machida commemorative volume. A product from the INternational focus group on Tephrochronology And Volcanism (INTAV) of the International Union for Quaternary Research (INQUA). This resulted from the inter-congress meeting "Active Tephra" which was held in Kirishima, Japan, from 9 to 17 May, 2010 and co-supported by PAGES.