202 



cherry. Aspen is also present in small pure stands, while paper 

 and black birch occur in considerable numbers, but are generally of 

 small size. However, the principal trees that characterize the mixture 

 are black, scarlet, and white oaks. The proportion of hickory and 

 basswood is small. Sugar maple grows singly or sometimes in pure 

 stands of limited extent on the more favorable bluff lands. 



TABLE VI. — Showing Estimated Percentage of Species for Upland Type 

 OF Northern Illinois, by Counties. 



The bluffs along the Mississippi, with their many high cliffs and 

 fantastic rock forms, are cut by narrow, steep-sided tributary valleys 

 which are largely wooded, excepting the narrow bottoms. The same 

 type of topography on a much smaller scale is carried up along the 

 Galena and Apple rivers. While many of the stands on this rough land 

 are in good condition, the majority of them have been either very 

 heavily cut over or clear cut and now are nothing but young growth 

 of a brushy nature. The edges of the cliffs and rocky ridge tops are 

 very conspicuous because of the great number of small juniper or red 

 cedar which form open stands on such sites. 



Back of the bluffs the country is rolling, with characteristic high 

 ridges marking the chief divides. The table-lands and more moderate 

 valley slopes are under cultivation, but the steeper slopes and narrow 

 ridge tops are generally completely wooded. The stands are mostly 

 of small second growth, suitable only for products such as ties, posts. 



