CLASSIFICATION BY THE BUREAU OF SOILS 91 



range in color from brown to grayish yellow, while the subsoils are 

 usually yellow to pale yellow. The series is developed in the deep 

 drift-covered areas of Wisconsin, Michigan, and Minnesota, and 

 are derived from sandy and gravelly glacial debris washed out from 

 the fronts of the glaciers. The type is also found in deep filled-in 

 valleys. The greater part of the material of the series has been 

 considerably assorted by glacial waters and consists mainly of sand 

 and gravel. 



Sioux Series. This series occurs in the glaciated region of 

 the central and northwestern states and comprises the dark brown 

 to black terrace soils and with a bed of gravel within three feet of 

 the surface. It occurs as narrow areas along streams instead of 

 bnjad outwash plains. 



~ Superior Series. The surface soils are gray, brown or reddish, 

 with pinkish red to light chocolate red rather dense clay subsoils. 

 The series comprises a group of glacial-lake soils developed 

 mostly along the margin of Lake Superior. The topography is 

 usually level to slightly undulating. The series is well adapted to 

 the production of grasses, grains and the general farm crops. 



Vergennes Series. This series is marked by brown, yellowish 

 or gray soils underlain at varying depths by drab to blue or light 

 gray clay subsoils, often calcareous. Jt consists of deep-water sedi- 

 ments known as the Champlain clays deposited in post-glacial times 

 over glacial drift during a period of submergence. Since the uplift 

 these clays have been more or less modified by the stream action 

 and colluvial wash from the surrounding highlands. The surface 

 is level to gently rolling. 



^ Waukesha Series. The Waukesha series is characterixed In- 

 dark brown to black surface soils underlain by yellow subsoils in 

 which fine gravel is usually present. They are derived from water- 

 assorted glacial debris deposited in broad filled-in valleys or as out- 

 wash plains and terraces, and are sandy and gravelly in general 

 character. They are more productive than 1'lainlield soils. 



VI. ATLANTIC AND (JTLK COASTAL PLAIN'S IMiOVI NCIC 



The Atlantic and (Julf Coastal Plains Province constitutes one 

 of the most important physiographic divisions of the Tinted States. 

 This province comprises approximately :}(>.">, 000 square miles of the 

 predominantly flat to smoothly rolling region bordering the Atlantic 

 Ocean and extending from the northern end of Long Island in New 



