4 BULLETIN 142, U. S. DEPARTMENT OF AGRICULTURE. 



through Bucyrus and Columbus to the vicinity of Chillicothe. The 

 line is irregular, and coincides roughly with the eastern boundary of 

 the Scioto Basin. From the vicinity of Chillicothe the southern 

 boundary extends generally westward through Hillsboro and Hamil- 

 ton, Ohio, to the Indiana State line. In southeastern Indiana the 

 southern boundary is irregular and crenulated, swinging north nearly 

 to Conhorsville, and thence southwestward through Greenburg to a 

 point seme 20 miles southeast of Columbus. Thence it extends 

 northwestward through Columbus and Martinsville nearly to Green- 

 castle. From this point the western boundary of the region ex- 

 tends in a generally northward direction, following approximately 

 the course of the Wabash Eiver, between Logansport and Coving- 

 ton. Between the Wabash and Tippecanoe Elvers a large area of 

 the soils of this series extends westward to the eastern part of 

 Pulaski County. The western boundary thence swings eastward to 

 the vicinity of Warsaw, and northward in a very irregular line to 

 Elkhart. From this point it crosses into Cass County, Mich. In 

 southwestern Michigan the soils of the Miami series are so intimately 

 associated with those of the Coloma series and with the soils of the 

 extensive outwash plains that it is almost impossible to establish 

 boundaries between sections dominated by the soils of the Miami 

 series and those in which soils of other series predominate. How- 

 ever, along the border of Lake Michigan and extending around its 

 southern end there is a belt of rolling and elevated territory within 

 which the Miami soils are decidedly important. This belt stretches 

 from the vicinity of Kalamazoo through the extreme southwestern 

 part of Michigan, around the end of Lake Michigan, but at some 

 distance from the shore. 



From Tiffin, Ohio, through Fostoria and Findlay to the north of 

 Lima, Ohio, and thence to the vicinity of Fort Wayne, Ind., the 

 soils of the Miami series are bordered to the north throughout the 

 Maumee Basin by an extensive, nearly level area, in which the soils 

 of the Clyde series are the most extensive. There are a few small 

 areas of Miami soils within this basin of the Maumee River. 



From Fort Wayne, Ind., the eastern boundary of the area within 

 which the soils of the Miami series predominate extends in an almost 

 due northeasterly direction to a point in the " thumb " of Michigan 

 immediately north of Bad Axe. To the east and south of this line 

 the soils of the Clyde series are extensively developed between the 

 area of Miami soils and the shores of the Lakes. In the Saginaw 

 Bay region the boundary of the Miami series extends southwestward 

 from near Bad Axe to the vicinity of Flint and thence westward to 

 a point a little to the northwest of St. Johns, Mich. Thence it fol- 



