Abstract
Two kinds of pumices and many sorts of decomposed pumices are found in the west-northern part of Kwanto district. One of the not decomposed pumices is an erupted material from Mt. Asama and the other is from Futatsudake in Mt. Haruna. Many kinds of decomposed pumices, probably from Mt. Asama are found in the vicinity of Mt.Haruna ; and other kinds from Mt.Asama, Mt.Haruna and Mt.Akagi are also found at the foot of Mt. Akagi. Socalled "Kanuma Soil''seems to be an erupted material from Mt.Akagi and "Imaichi Soil" is an eruption from Mt.Nantai. From the mineralogical view point, above pumice-soil seems to be roughly classified as follows;[table]
