Loose Incoherent Sands and Mock Outcrop, 45 



are by reason of their texture or present physiographic position 

 usually unproductive. These have been embraced under the fol- 

 lowing types: 



Dunesand. — Consists of loose, incoherent sand of medium to fine 

 grades to a depth of 3 feet or more, and often extending to a depth 

 of 100 feet. Occupies hillocks, rounded hills, or ridges from 2 to 

 200 feet in height. Found along shores of lakes, rivers, or oceans 

 and in deserts. Usually of no agricultural value on account of the 

 irregular surface, the loose open nature of the material, the small 

 water-holding power, and the unstable and drifting nature of the 

 soil. In arid regions, when leveled and under irrigation, it is often 

 very productive, especially for small fruits and vegetables. The 

 encroachment of these sands on cultivated fields, orchards, cran- 

 berry bogs, and even upon houses, towns, and harbors is often a 

 serious problem, and much experimentation and labor lias at times 

 been expended in binding them with grasses and trees to prevent 

 their shifting. 



12 3 4 



Soil (2) 2.5 71 2 2 



Subsoil (1) 13 83 1 1 



Acres. 



Allegan County, Mich 3, 130 



Imperial, Cal 116, 288 



Indio, Cal 8, 256 



Acres. 



Los Angeles, Cal 3, 261 



Lower Arkansas Valley, Colo . . 3, 328 

 Ventura, Cal 2, 020 



Sandhill. — Coarse, loose, incoherent sand, 10 feet or more in 

 depth. Occurs in hills from 20 to 200 feet or more in height, 

 either as long, narrow ranges or frequently as isolated hills, 

 representing old shore lines of the ocean or formed by river 

 action and wind. Soil generally more stable than the Dunesand. 

 Material is generally so loose and incoherent and so thoroughly 

 drained that it has little agricultural value. In humid regions it 

 supports a growth of stunted oak and pine. In the arid regions 

 there is some little pasturage. Occasionally valleys or low places 

 produce fair crops of vegetables. Peaches are grown to a slight 

 extent, but this type generally is unproductive. 



1 



Soil (3) 55 



Subsoil (1) 66 



Acres. 



Darlington, S. C 30, 656 



Ealeigh to Newbern, X. C 5, 320 



