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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.
Basalt fiber is made from a single material, crushed basalt, from a carefully chosen quarry source. [1] Basalt of high acidity (over 46% silica content [2]) and low iron content is considered desirable for fiber production. [3] Unlike with other composites, such as glass fiber, essentially no materials are added during its production.
The Dickson Mounds Museum is a museum erected on the site in 1972 by the U.S. state of Illinois; it describes the life cycles and culture of Native Americans living in the Illinois River valley over a period of 12,000 years since the last ice age. The museum is part of the Illinois State Museum system. [5]
A map showing approximate areas of various Mississippian and related cultures. The Koster Site is located near the center of this map in the upper part of the Middle Mississippi area. The Koster Site is a prehistoric archaeological site located south of Eldred, Illinois. The site covers more than 3 acres and extends 30 feet down into the ...
Ordovician rocks in Illinois are divided into three series, each separated by an unconformity; from oldest to youngest, these are the Canadian, Champlainian, and Cincinnatian series. Ordovician features in Illinois include the now-buried Glasford Structure in Peoria County , a crater caused by a meteorite impact roughly 455 million years ago.
Watersheds of Illinois is a list of basins or catchment areas into which the State of Illinois can be divided based on the place to which water flows.. At the simplest level, in pre-settlement times, Illinois had two watersheds: the Mississippi River and Lake Michigan, with almost the entire State draining to the Mississippi, except for a small area within a few miles of the Lake.
The Illinois Salines, also known as the Saline Springs or Great Salt Springs, is a salt spring site located along the Saline River in Gallatin County, Illinois.The site was a source of salt for Illinois' prehistoric settlers and is now an archaeological site with a large quantity of organic remains.
Belknap, IL resident W. Marshall stated that the Cache River Basin was “good country for men and dogs, but powerful trying on women and oxen.” [6] Between 1810 and 1890 timber harvesting became a major industry in the Cache basin, Cypress wood was sought for its lightness and water-resistant properties. The small towns on the edge of the ...