94 SOIL PHYSICS AND MANAGEMENT 



careous clays, chalk beds and rotten limestone, of Cretaceous age. 

 The soils of this series are very productive and are devoted chiefly 

 to cotton and corn, but alfalfa will grow on some of the types. The 

 area mapped comprises 6,300,000 acres. 



Lake Charles Series. The soils of this series are gray to 

 black in color, with mottled yellow and red subsoils carrying lime 

 and iron concretions. The surface is marked by low sandy mounds 

 or hummocks. The subsoil is quite resistant to the movements of 

 moistures, and drainage is poorly established. The soils are best 

 suited to sugar cane and grass. The series occurs on both prairie 

 and tree-covered areas and consists mainly of reworked loessial 

 material. The sand mounds are inclined to be drouthy. Some 

 rice is grown. 



Leonardtown Series. The soils of this series are gray to pale 

 yellow in color. The subsoils are mottled gray, yellow and red and 

 ordinarily carry clay lenses and pockets of sand. They are gently 

 rolling to rolling. They are best suited to general farm crops. 



Lufkin Series. The surface soils are light gray and underlain 

 by impervious, plastic and gray to mottled gray and yellow sub- 

 soils. The difference in texture between the surface soil and sub- 

 soil in the case of the sandy members is very marked. The to- 

 pography is flat and drainage is poor. The soils are locally known 

 as " flatwoods" land. The timber growth consists largely of scrubby 

 oak and post oak. About two million acres have been mapped. 



Maverick Series. The soils are light gray to brownish in 

 color and the subsoils yellowish brown to drab and of heavier tex- 

 ture. They are formed by the mixing of limestone and sandstone 

 with calcareous clays. 



Monroe Series. These soils are gray to brown, with mottled 

 yellow and red friable structure of the subsoils. They occupy nearly 

 level to rolling uplands throughout the Atlantic and Gulf Coastal 

 Plains and have been derived mainly from the Piedmont-Appa- 

 lachian material. The soils are usually deficient in organic matter. 

 They are variously adapted to early, medium and late truck crops. 

 The area mapped comprises thirteen and one-half million acres. 



Nueces Series. The soils and subsoils of this series 'are gray 

 and are underlain by a stratum of stiff, mottled, grayish clay. The 

 soils are derived from wind-blown material originally from the 

 residual prairies, which has drifted inland from the coast. The 

 surface is prevailing flat, with a few dunes. They are poor agri- 

 culturally. The soils are devoted to corn, truck crops, and pasture. 



