September, 1943 Brown & YEAGER: SURVEY OF FuR RESOURCE 445 
Fig. 9—Sand Prairie habitat type, typical of several small regions in northern Illinois. 
Relatively unproductive soil and a general scarcity of marshes and streams account for the low 
fur yield for most species in the Central Sand Prairie Region. 
loams and clays, suggests the name. Many § est river in the region, the Embarrass, was 
of the larger and most of the smaller reduced to water holes during the fall of 
streams are intermittent. Rapid runoff, 1940. Much of the land is too poor for 
due to extensive clearing, a rolling topog- profitable farming, and a percentage un- 
raphy and tight gumbo subsoils, is largely usual in Illinois has reverted to unculti- 
responsible for this condition. The larg- vated fields and brushland, fig. 10. As 
Fig. 10.—Gray Prairie habitat type. Characterized by good upland cover but a poor water 
supply, this type is comparatively low in fur production. Extensive woodland and non-intensive 
agriculture here favor most fur animals, but only a few permanent streams offer satisfactory 
range to such species as raccoons, minks and muskrats. 
