616 EXPERIMENT STATION EECOED. 



" The topographic features of the county are quite varied and fall into four 

 main divisions, tlie Tennessee River and creelc flood plains, the mountain areas, 

 the valley section, and the Coastal Plain. . . . Drainage is well established 

 throughout the county." The soils are of residual and alluvial origin. Thirty 

 soil types of 11 series are mapped, of which the Decatur clay loam is the most 

 extensive type, with the Dekalb silt loam and stony loam second and third 

 in extent. 



Soil survey of Pottawattamie County, Iowa, A. L. Goodman, P. Hanson, 

 and II. W. Reid {U. S. Dcpt. Agr., Advaiwe Sheets Field Operations Bur. Soils, 

 1914, pp. 30. fig. 1, map 1). — This survey, made in cooperation with the Iowa 

 Experiment Station and issued February 10, 1916. deals with the soils of an 

 area of G12.4S0 acres in southwestern Iowa. " About three-fourths of the county 

 consists of smoothly rolling to hilly loessial uplands, and the remaining 27 per 

 cent of the area consists of flat to very gently imdulating alluvial plains, 

 mostly first bottoms. . . , The county as a whole is drained toward the .south- 

 west through the main tributaries of the Missouri River, including Boyer and 

 East and West Nlshnabotna rivers, and Mosquito and Pigeon creeks. The over- 

 flowed bottom lands along these drainage ways are comparatively wide and 

 comprise some of the most fertile lands in the county." 



The soils of the county range from very fine sand to clay in texture and are 

 of sedimentary, eolian, colluvial, and alluvial origin. Nine soil types of six 

 series are mapped, of which the Marshall silt loam covers G8 per cent of the 

 area and the Wabash silt loam 13.4 per cent. 



Soil survey of Harrison County, Missouri, E. S. Vanatta and E. W. Knorel 

 {U. S. Dcpt. Agr., Advamc Shcdn Fixld Operations Rur. Soils, 191J,, pp. 86, 

 fig. 1, map 1). — This survey, made in cooperation with the Missouri Exi^eri- 

 ment Station and issued January 15, 191G, deals with the soils of an area of 

 461,440 acres in northwestern Missouri. 



" There are three main topographic divisions in the county, the uplands, 

 terraces, and bottom lands. The surface configuration of the first is gently 

 undulating to broken, of the .second gently undulating, and of the third flat to 

 gently undulating. The bottom lands are subject to overflow. The eastern third 

 of the county is drained by Thompson Fork of Grand River and its tributaries, 

 the central lialf by Big Creek and its tributaries, and the western sixth by 

 several minor creeks." 



The upland soils are of glacial origin and are loams and silts in texture. 

 The terrace soils are silts and the first bottom soils very fine sand to clay. Ten 

 soil types of eight series are mapped, of which the Shelby hiam iS nmch the 

 most extensive, with the Grundy silt loam second, and the Wabash silt loam 

 with a colluvial phase third in extent. 



Soil survey of the Freeliold area. New Jersey, H. .Tennings, J. B. R. Dickey, 

 and Iv. L. Lee {U. S. Dcpt. Agr., Advaiice Sheets Field Operations Bur. Soils, 

 1913, pp. 51, pi. 1, fig. 1. map 1). — This survey, made in cooperation with the 

 New Jersey Geological Survey and the New Jersey Experiment Station and 

 issued February 4, 1916, deals with the soils of an area of 195.520 acres in 

 eastern New Jersey, which lies in the Coastal Plain and includes northern Mon- 

 mouth County and part of eastern Middlesex County. The topography of the 

 area varies in general from level to undulating, with some comparatively hilly 

 sections. The area is drained by small streams. 



The soils vary greatly in texture and in the materials from which they are 

 derived. Including several miscellaneous types, 38 soil types of eight series 

 are mapped, of which the Sassafras series, including loam, loamy sand, fine 

 sandy loam, sand, sandy loam, fine sand, and coarse sand, is the most extensive. 



