. Comprehensive plan for the Illinois Nature Preserves System. Nature conservation; Wilderness areas. a NORTHERN SECTION The Northern Section is distinguished by its forest composition, the presence of wet prairies and marshes, and the absence of the coastal plain trees of the Southern Section. The bottomlands of this section near St. Louis are called the "Ameri- can Bottoms". PRINCIPAL NATURAL FEATURES FOREST: Bottomland. PRAIRIE: Wet, mesic. MARSH TOPOGRAPHY: River floodplain, meander scars. AQUATIC HABITATS: Oxbow lakes, Missis- sippi River. b SOUTHERN SECTION The bottomland fores
. Comprehensive plan for the Illinois Nature Preserves System. Nature conservation; Wilderness areas. a NORTHERN SECTION The Northern Section is distinguished by its forest composition, the presence of wet prairies and marshes, and the absence of the coastal plain trees of the Southern Section. The bottomlands of this section near St. Louis are called the "Ameri- can Bottoms". PRINCIPAL NATURAL FEATURES FOREST: Bottomland. PRAIRIE: Wet, mesic. MARSH TOPOGRAPHY: River floodplain, meander scars. AQUATIC HABITATS: Oxbow lakes, Missis- sippi River. b SOUTHERN SECTION The bottomland forests of the Southern Sec- tion contain a greater number of tree species, in- cluding some bottomland swamp species typical of the coastal plain. The composition of the forests in this section varies with the soils. PRINCIPAL NATURAL FEATURES FOREST: Bottomland on heavy soils, bottom- land on light soils, bottomland swamp. TOPOGRAPHY: River floodplain, meander scars. AQUATIC HABITATS: Oxbow lakes, Missis- sippi River. SPECIAL FEATURE: Springfed swamps. 13 SHAWNEE HILLS DIVISION The Shawnee Hills ex tend across the southern tip of the State from Fountain Bluff on the Mississippi River to the Shawneetown Hills near the mouth of the Wa - bash River. This un- glaciated hill country is characterized by a high east-west escarp- ment of sandstone cliffs forming the Greater Shaw- nee Hills and a series of lower hills underlain by lime- stone and sandstone known as the Lesser Shawnee Hills. Ori. ginally this division was mostly forested and con- siderable forest remains to the present time. There are a number of distinctive plant species restricted to this division of Illinois. BEDROCK The Greater Shawnee Hills form a band along the northern edge of the division and consist of massive Pennsylvanian sandstone strata that dip northward toward the Illinois Basin. The range of hills averages 10 miles wide and borders the Les- ser Shawnee Hills to the south. The Lesser Shaw- nee Hills are under
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