. Comprehensive plan for the Illinois Nature Preserves System. Nature conservation; Wilderness areas. THE NATURAL DIVISIONS OF ILLINOIS INTRODUCTION The "Natural Divisions of Illinois" is a classi- fication of the natural environments and biotlc communities of Illinois based on physiography, flora, and fauna. The general approach was first applied to Illinois by Vestal (1931), who developed a preliminary vegetation map of the State based mainly on topography, soil type, and natural vege- tation (Figure 2). Smith (1961) found that patterns of herpetofaunal distribution reinforced many
. Comprehensive plan for the Illinois Nature Preserves System. Nature conservation; Wilderness areas. THE NATURAL DIVISIONS OF ILLINOIS INTRODUCTION The "Natural Divisions of Illinois" is a classi- fication of the natural environments and biotlc communities of Illinois based on physiography, flora, and fauna. The general approach was first applied to Illinois by Vestal (1931), who developed a preliminary vegetation map of the State based mainly on topography, soil type, and natural vege- tation (Figure 2). Smith (1961) found that patterns of herpetofaunal distribution reinforced many of Vestal's vegetational divisions. He developed a map of the herpetofaunal divisions of Illinois (Fig- ure 3) based on a modification of Vestal's map. Lindsey, Schmelz, and Nichols (1969) used the natural divisions concept in Indiana. The natural divisions of Illinois (Figure 1) have been derived through an expansion of Vestal's approach. Factors considered in delimiting the 14 natural divisions are topography, soils, bed- rock, glacial history, and the distribution of. |^!55?^. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois Nature Preserves Commission; Illinois. Framework Advisory Committee; Illinois Archeological Survey; Illinois. Dept. of Conservation. Rockford, Ill. : Illinois Nature Preserves Commission
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