214 EXPERIMENT STATION EECOED. 



of an area of 14,576,000 acres, including nineteen counties, in south-central 

 Texas. Ttie greater part of the area lies in the rough stony section of the 

 Edwards Plateau. " With the exception of the small level tract in Crockett and 

 Schleicher counties, the area is as thoroughly drained as any section of equal 

 size in the State, there being more than twenty rivers within its limits carrying 

 Avater the entire year. In fact, drainage throughout much of the area is 

 excessive, . . . 



" Most of the soils are derived from calcareous materials and are relatively 

 high in lime and humus. Those derived from crystalline roclvs are low in both 

 these constituents. The soils of the Coastal Plain section consist of the dark- 

 colored Houston types, the gray-colored Blanco and Laredo types, and the 

 reddish-brown Miller and San Antonio types. On the uplands of the Edwards 

 Plateau are found the reddish-brown to black soils of the Crawford series, the 

 gray to light-brown soils of the Brackett and Miles series, and large areas of rough 

 stony land. On the terraces and in the valley basins are found the Frio and 

 Roswell series and the reddish-colored soils of the Padernales series. In the 

 Llano-Burnet basin are found four groups of soils derived from crystalline ma- 

 terials. These are the reddish-colored Tishomingo soils, the most varied group 

 in the area ; the Pontotoc soils, a bright-red series derivetl from sandstone ; the 

 grayish-brown Lancaster series; and a miscellaneous group called Katemcy 

 soils." Forty soil types are mapped, of which the Crawford stony clay and rough 

 stony land of tlie uplands of the Edwards Plateau are the predominating types. 

 " On account of the facilities for irrigation, the most valuable of these soils are 

 the Frio, Laredo, Blanco, and San Antonio types. ... A large proportion of 

 the types are too rough and stony for cultivation." 



Soil survey of the Cache Valley area. Utah, J. W. Nelson and E. C. Eck- 

 MANN {U. S. Dipt. Agr., Advance Sheets Field Operations Bur. Soiis, 1913, pp. 

 70, pis. If, fig. 1, map 1). — This survey, issued June 26, 1915, deals with the soils 

 of an area of 28S.000 acres in the northern part of Utah and extending into 

 Idaho, which is drained through the Bear River. The materials deposited in the 

 valley since its formation are grouped as lake-laid deposits and alluvial deposits. 

 Thirty-eight soil types, representing 12 series, are mapped, of which the Trenton 

 series, including fine sandy loam, clay, loam, silty clay loam, and clay loam, is 

 the most extensive. " The valley is well watered and adapted to a varied agri- 

 culture. . . . Some alkali occurs in low, poorly drained places over the valley 

 floor, and a considerable area is in need of drainage." 



Soil survey of Stevens County, Washington, C. Van Dtttne and F. W. 

 AsHTOJf (U. S. Dcpt. Agr., Advance Sheets Field Operations Bur. Soils, 191S, 

 pp. 137, pis. 5, figs. 5, map 1). — This survey, made in cooperation with the State 

 of Washington and issued November 6, 1915, deals with the soils of an area of 

 1,531,840 acres in northeastern Washington which is divided into six general 

 physiographic divisions, the Columbia-Kettle River Valley, the Colville-Chamo- 

 kane Valley, the Spokane River Valley, the Spokane Plateau, the Calispell 

 Mountain Range, and the Huckleberry Mountain Range. The greater part of 

 the county is well drained, a small total area is excessively drained, and a still 

 smaller part is poorly drained. 



With reference to the physical factors affecting the agricultural value of the 

 soils, the land is divided into poorly-drained areas, well-drained areas with 

 favorable moisture supply, excessively-drained areas subject to occasional 

 drought, hilly lands, and rough, stony, or mountainous areas, the last two areas 

 being the most extensive, covering 39.6 and 39.2 per cent of the total area, 

 respectively. With reference to origin, the .soils of the county are classified as 

 residual soils, ghuial drift soils, glacial lake and river terrace deposits, wind 

 laid deposits, alluvial fan and foot slope material, flood plain deposits, organic 



