All the volcanic ashes have been formed by certain developmental processes, which are continuous. Brown volcanic ash is accumulated at the foot of the Kurikoma volcanoes, but no black volcanic ash with colored minerals was found there. In the west areas at the feet of the volcanoes, the brown volcanic ash is changed into glei soil which shows a gray white color due to the underground water. Some of glei solis are formed by melting water of the remaining snow in the southern part of the summit of the volcanoes. Rusy mottles are shown in the upper part of glei horizon. The relation between gleization and the remaining snow area is an interesting phenomenon.
