92 SOIL PHYSICS AND MANAGEMENT 



York to the southern extremity of Florida and along the Gulf of 

 Mexico to the mouth of the liio Grande. There is a broad gap in 

 the Gulf Plain represented hy the Mississippi bottoms and the belt 

 of loessial soils adjoining the bottoms on the east. 



In its general aspect, the Atlantic and Gulf Coastal Plains 

 Province consists of a broad plain which rises gradually either from 

 sea level or low bluffs along the coast to the border of the high 

 inland regions of different topographic forms. The inner boundary, 

 representing the highest part of the main province, varies from 

 200 to 500 or 600 feet above sea level. This region, although 

 formerly a plain changing to a gradual slope from the sea inland, 

 has been eroded since its uplift above sea level to its present vary- 

 ing topographic features of low to moderate relief as compared with 

 the much more uneven surface of the Appalachian and Piedmont 

 regions. The most important series are as follows: 



Acadia Series. The surface soils are light gray or white, with 

 mottled gray and yellow, or gray, yellow and red friable subsoils, 

 carrying lime nodules and iron concretions. They are derived 

 mainly from reworked loessial material. The surface is gently 

 rolling, and the series is now timbered with pine, oak, gum, hickory 

 and some cypress. It is adapted to the production of corn, cotton, 

 peas, and oats. 



Brennan Series. This series consists of gray calcareous soils 

 containing a small amount of humus and a large amount of lime. 

 They have been derived from Pleistocene deposits in broad valleys. 

 They are of higher agricultural value than the former. 



Caddo Series. The soils are gray to yellow in color. The sub- 

 soils are mottled gray and yellow, or gray, yellow and red, and of a 

 rather stiff structure. In some places the subsoil has a pronounced 

 grayish color, while in others it is a mottled yellow and gray. Low 

 sandy mounds or hummocks are a feature of the series. Cotton 

 and corn are the principal crops. These soils are most 'extensively 

 developed in northwestern Louisiana and northeastern Texas and 

 are derived from reworked loessial material. 



Coxville Series. The series comprises dark gray to nearly 

 black soils derived from the quiet or deep-water deposits' of the 

 Columbia formation. The subsoils range from a moderately mellow 

 friable clay in the upper portion to yellowish plastic compact clay 

 mottled with drab and bright red in the lower portion. The 

 topography is prevailingly flat. They are well adapted to cotton, 

 corn, oats, and certain varieties of strawberries. 



