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  2. Geology of Illinois - Wikipedia

    en.wikipedia.org/wiki/Geology_of_Illinois

    The geology of Illinois includes extensive deposits of marine sedimentary rocks from the Palaeozoic, as well as relatively minor contributions from the Mesozoic and Cenozoic. Ice age glaciation left a wealth of glacial topographic features throughout the state.

  3. Illinois Basin - Wikipedia

    en.wikipedia.org/wiki/Illinois_Basin

    The Illinois Basin is a Paleozoic depositional and structural basin in the United States, centered in and underlying most of the state of Illinois, and extending into southwestern Indiana and western Kentucky. The basin is elongate, extending approximately 400 miles (640 km) northwest-southeast, and 200 miles (320 km) southwest-northeast.

  4. Prairie Research Institute - Wikipedia

    en.wikipedia.org/wiki/Prairie_Research_Institute

    The Illinois State Geological Survey conducts basic and applied geological research, creates new geologic maps, and gathers and manages the state's geological data. [22] ISGS houses the legislatively mandated Illinois Geological Samples Library, a repository for drill-hole samples in Illinois, including cores drilled for mineral exploration and ...

  5. Geography of Illinois - Wikipedia

    en.wikipedia.org/wiki/Geography_of_Illinois

    Nearly the entire western boundary of Illinois is the Mississippi River, except for a few areas where the river has changed course. Illinois' southeastern and southern boundary is along the Wabash River and the Ohio River, whereas its northern boundary and much of its eastern boundary are straight survey (longitudinal and latitudinal) lines ...

  6. Sandwich Fault Zone - Wikipedia

    en.wikipedia.org/wiki/Sandwich_Fault_Zone

    The Sandwich Fault Zone is a fault zone that runs northwest from Oswego to Ogle County, transecting Lee County in Northern Illinois.The fault has generally not been active, although a minor earthquake was reported in 2002 and 2010. [1]

  7. Pope Mega Group - Wikipedia

    en.wikipedia.org/wiki/Pope_Mega_Group

    The Pope Mega Group is a geologic unit found in the Illinois Basin of southern Illinois, southwestern Indiana, and western Kentucky. [1] [2] In Indiana and Kentucky its equitant is the Buffalo Wallow Group. This unit grades from sandstones at its base into mix of limestones and sandstone and then a shale at its top. [3]

  8. Crab Orchard Wilderness - Wikipedia

    en.wikipedia.org/wiki/Crab_Orchard_Wilderness

    As with other wilderness areas in southern Illinois, ... U.S. Geological Survey Map at the U.S. Geological Survey Map Website. Retrieved April 8, 2023.

  9. List of National Natural Landmarks in Illinois - Wikipedia

    en.wikipedia.org/wiki/List_of_National_Natural...

    The National Natural Landmarks (NNLs) in Illinois include 18 of the almost 600 such landmarks in the United States. They cover areas of geological, biological and historical importance, and include lakes, bogs, canyons and forests. Several of the sites provide habitat for rare or endangered plant and animal species.