. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. extending about 12 miles ( km), with peat mea- sured to a depth of 30 feet ( m) (Soper and Osbon 1922). Peat was being mined in this deposit for fuel long before 1877 (Bent 1877). Early soil surveys included muck soils (organic sediments—plant materials well decomposed and indistinguishable) in their total estimates of peat for each county, probably because muck and peat deposits often occurr
. The changing Illinois environment : critical trends : technical report of the Critical Trends Assessment Project. Man; Pollution; Environmental protection; Ecology; Environmental impact analysis. extending about 12 miles ( km), with peat mea- sured to a depth of 30 feet ( m) (Soper and Osbon 1922). Peat was being mined in this deposit for fuel long before 1877 (Bent 1877). Early soil surveys included muck soils (organic sediments—plant materials well decomposed and indistinguishable) in their total estimates of peat for each county, probably because muck and peat deposits often occurred within the same wetland complex. This incorporation resulted in an overestimate of peat acreage. Conversely, countless small pothole depres- sions supporting peat occurred throughout the northern third of Illinois and would not have been included in these estimates because individually they were too small; collectively, however, they composed substantial acreage. Furthermore, modern soil surveys are often at least 20 years old and no longer accurately reflect the. Bog Fen Seep Panne Figure 9. Amounts of high-quality rare wetland types in Illinois. Panne Figure 10. Locations of fens, bogs, seeps, and pannes identified by the Illinois Natural Areas Inventory as significant and relatively undisturbed remnants. Source: White 1978. Illinois Natural Areas Inventory digital database. 98. 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. Dept. of Energy and Natural Resources; Critical Trends Assessment Project. Springfield, Ill. : Ill. Dept. of Energy and Natural Resources
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