All river transects were located in soil region “H" (soil regions described 
below), and the rivers sampled were as follows: 
1R Muscatatuck River, southeastern Indiana, 21 miles 
eR White River (Hast Fork), southwestern Indiana, 17 miles 
SR Wabash River, west-central Indiana, 12 miles 
4R Kankakee River, northwestern Indiana, 21 miles 
5R Elkhart River, northeastern Indiana, 17 miles 
Investigative car transects were laid out in 11 counties in northern 
Indiana, and one was run in the sinkhole country of south-central Indiana. 
Due to the drainage pattern of most of the counties censused, transect stops 
were made on dredge ditches and small streams at the bridges. At each stop, 
visibility each direction from the bridge was estimated in yards so that the 
actual mileage of ditch covered could be computed for each county. Potholes 
occurring along transect routes were also censused, often on foot, depending 
on visibility. In the rolling, pothole country of northeastern Indiana, car 
transects were found inapplicable, while dredge ditch sampling may hold some 
promise in the relatively flat northwestern counties. Practically all car 
transects were run in soil regions “A" ang "D", 
Semi-intensive foot coverage of selected study areas in 9 northern 
counties was carried out. 5mall areas were waded at intervals by the investi- 
gator while larger areas were censused by canoe. Although this type of 
coverage gave worthwhile resulte, the lack of personnel and the time required 
restricted the amount of such acreage that could be censused. The majority 
of study areas was situated in soil region "A", 
Areas 
Region Ai This region consists of sand ridges, plains, and marshes 
which are now artificially drained. There is a sandy or gravelly subetratum 
and the main soil types are more or less sandy loams of the Maumee, Plainfield, 
Tracy, and Door series. Mucks are also present. 
The Maumee series includes low, level, black soils which have been 
reclaimed from marshes by ditching. Plainfield fine sand is a light-colored, 
timbered, loose, thin, droughty soil which often forms sand dunes. Black oaks 
comprise the major type of vegetation on such dunes. 
Tracy soils are light-colored, while the (prairie) Door soils are darker. 
These types, together with associated soils, have loamy topsoils with somewhat 
heavier sub-soils which help to reduce the droughtiness due to the porous sub- 
stratum. These types lie on a level plain. 
Muck includes black, loose, deep organic soils of varying depths which 
will burn when dry and much of this area has been drained by ditches. 
Region Di This is a region of irregular topography with many lakes and 
pelts of rolling hills. There is much local variation in soils, most of which 
are usually loamy or sandy in texture. Miami and Bellefontaine loams are found 
on the more rolling land. Both of these series have a light grayish-brown top- 
soil. Crosby loam may be found on flat land as a brownish-gray soil. The 
above types are considered "high ground" soils. Moderately low ground is 
commonly Brookston loam, while Clyde loam is deeper, darker, black land found 
in more poorly drained areas. On the lowest ground, muck is found. 
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