( 54 



\ 



, , Flat lands 



Formations. Mountains. (below 15 Total area. 



inclination) 



cho cho cho 



Plutonic rocks 3,862,082.0 774,183.6 4.638,266.5 



Volcanic rocks 5,655,850.2 1,959,69.19 7,615,542.1 



Archean rocks 1,244,027.6 228,480.8 1,472,518.4 



Paleozoic rocks 4,488,836.2 , 802,935.0 5,291,771.2 



Mesozcic rocks 2,370,631.5 638,426.5 3,009,056.0 



Tertiary 4,005,492.7 3,496,152.6 7,501,645.3 



Old Quaternary 78,787.5 2,542,578.6 2,621, 365. i 



Young Quaternar y 171,779.2 4,331.195.8 4,502.975.0 



Total 21,877,487.8 14,775,654.8 36,653,142.6 



N.B. "cho " is nearly equivalent to 2.5 acres. 



As shown in the table, the volcanic rocks occupy the 

 largest area and the Tertiary formations follow next, whilst 

 the area of the former as flat land is far less than that of the 

 Tertiary. Paleozoic and Plutonic Rocks occur widely, but 

 their area as flat land is comparatively little. The Old and 

 Young Quaternary formations appear to occupy rriore &at land 

 than slopes. 



I. SOILS FROM VOLCANIC ROCKS. 



of volcanic rocks, andesite, basalt, trachyte, volcanic tuff 

 and ashes prevail in this country occupying the widest area. 

 But the larger part of the land occupied by them has large 

 inclinations, that is, flat land with an inclination of less than 15 

 degrees is 349^ of its total area. These flat lands remain still 

 uncultivated as grasslands in north Japan, 



Though widely differing in the nature of the rocks from 

 which they were derived and their chemical constituents, most 

 of them are rich in potash^ phosphoric acid, lime, magnesia. 



