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The Illinois side includes Henry County, Mercer County, and Rock Island County. [4] In extreme northwestern Illinois the Driftless Zone, a region of unglaciated and therefore higher and more rugged topography, occupies a small part of the state. Charles Mound, located in this region, is the state's highest elevation above sea level.
The earliest Carboniferous rocks sit conformably on top of the youngest Devonian in Illinois; Carboniferous rocks in the state are areally extensive, regionally very well-exposed, and form a large percentage of the state's bedrock. Illinois remained marine for much of the Carboniferous, with limestones making up most of the rock deposited ...
Illinois Caverns is a state natural area in the New Design Precinct of Monroe County, Illinois. It features Illinois Caverns which is alternatively known as Mammoth Cave of Illinois (also Burksville Cave, Egyptian Cave, Eckert Cave). Illinois Caverns is the second-largest cave in Illinois and has more than 9.6 km of passages. [1]
Sunset on the Garden of the Gods Wilderness Passage between the Wilderness' rocks. The Garden of the Gods Wilderness is a 3,318-acre (13.43 km 2) parcel of land listed as a Wilderness Area of the United States. It is located within the Shawnee National Forest in Hardin, Pope, Saline, and Gallatin counties in the U.S. state of Illinois.
Natural Landmarks in Illinois range from 53 to 6,500 acres (21.4 to 2,630.5 ha; 0.1 to 10.2 sq mi) in size. Owners include private individuals or organizations, and several county, state and federal agencies. [2] The National Natural Landmarks Program is administered by the National Park Service, a branch of the Department of the Interior. The ...
William W. Powers State Recreation Area is an Illinois state park administered by the Illinois Department of Natural Resources on 580 acres (230 ha) in the Hegewisch community area of the City of Chicago in Cook County, Illinois, United States. [1]