IriijMrial Series. 149 



Roswell sandy loam. — Heavy gray sandy loam 12 inches deep; 

 subsoil is a light loam underlain by clay at a depth of 5 feet. 

 Level second-bottom land derived from lacustrine deposits, poorly 

 drained, often containing alkali. Recognized as good farming 



land. 



I •-' ;} 4 



Soil (3) 1 48 24 16 



Acres. 

 Pecos Valley, N. Mex 9, 090 



Roswell loam. — Loam, 4 feet deep, underlain by clay loam and 

 clay. Level, low bench land. Lacustrine deposit. Soil is natur- 

 ally poorly drained and contains alkali, ])ut when well drained 

 and free from alkali it is recognized as good soil for general farm 



crops. 



Acres. 

 Pecos Valley, X. Mex 2, 730 



IMPERIAL SERIES. 



This is an important group of soils found in the Colorado Delta. 



Imperial gravelly loam. — A gravelly loam about 2 feet deep, 

 underlain by clay to a depth of 6 feet or more. In some areas the 

 interstitial material becomes quite sandy. The gravel consists of 

 agate, quartz, chert, limestone, granite, obsidian, and indurated 

 clay, varying in size from 1 inch to 5 or 6 inches in diameter. 

 Represents old beach lines or alluvial cones. In the lighter phases 

 the soil contains little alkali, but elsewhere the alkali content is 

 high. Too rough for cultivation. Subject in places to destructive 

 erosions by mountain floods. Much of it lies too high for culti- 

 vation. When irrigable and not too alkaline, siatable for fruits 

 and vegetables. 



II 3 4 



Soil (1) •'3 53 7 16 



Subsoil (1) 7 17 25 51 



Acres. 

 Imperial, Cal 43,328 



Imperial sand. — Fine sand 5 feet deep, underlain by loam or clay. 

 The sand is generally well drained and free from harmful quan- 

 tities of alkali, but the loam or clay subsoil contains alkali in 

 excess, Avhich will rise to the surface, to the detriment to the land. 



