160 Soils of the Far West. 



Salt River adobe. — Clay loam with adobe properties, 2 feet deep, 

 underlain by sandy loam or loam. Low-lying land, containing 

 alkali, and rather poorly drained. Sediment of prehistoric irri- 

 gation with muddy water. Generally adapted to alfalfa and small 

 grain. 



12 3 4 



Soil (5) 4 30 31 28 



Subsoil (3) 2 4-1 25 24 



Acres. 

 Salt River Valley, Ariz 13, 665 



Sierra adobe. — Sandy adobe containing small amounts of gravel 

 to a depth of 2 or 3 feet, generally underlain by red sandstone, 

 hardpan, or granite rock. Low foothills. Residual soil derived 

 from decomposition of underlying granite, used to some extent 

 for dry-farming wheat and barley. 



12 3 4 



Soil (2) 11 42 33 14 



Subsoil (1) 12 27 33 28 



Acres. 



Fresno, Cal 13, 376 



Los Angeles, Cal 6, 976 



GYPSUM SOILS. 



Gypsum. — Light-brown or reddish-brown sandy loam or loam 

 soil, underlain by soft saccharoidal gypsum at a depth of from a 

 few inches to 6 feet. Gypsum is often present at the surface. 

 Level bench land. Derived from disintegration of gypsum depos- 

 its and possesses remarkable power of transmitting seepage waters 

 by capillary and gravitational flow. With high salt content of 

 irrigation water it is not desirable land for agricultural purposes. 

 Often contains large quantities of alkali. 



12 3 4 



Soil (2) 3 50 24 18 



Subsoil (5) 3 33 19 38 



Acres. 



Pecos Valley, N. Mex <' 11, 630 



Laramie, Wyo 2, 304 



a Mapped as Pecos gypsum, which name will not be used hereafter. 



