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Paleogeographic reconstruction showing the Illinois Basin area during the Middle Devonian period. [9] Almost all Silurian rocks in Illinois are deep-water limestone and dolomite deposits; reef habitats were common, and fossils of reef organisms are locally highly abundant, including corals, brachiopods, crinoids, stromatoporoids, and bryozoans. [6]
Thornton Quarry, just south of Chicago, Illinois. One of the largest aggregate quarries in the world, 1.5 miles (2.4 km) long, 0.5 miles wide, and up to 450 feet deep, site of a Silurian reef. Quarried since 1836. The quarry also acts as an emergency flood control reservoir as part of Chicago Deep Tunnel project.
Thornton Quarry is one of the largest aggregate quarries in the world, located in Thornton, Illinois just south of Chicago. The quarry is 1.5 miles (2.4 km) long, 0.5 miles (0.80 km) wide, and 450 feet (140 m) deep at its deepest point. Gallagher Asphalt Corporation has been operating on the grounds of the quarry since 1928.
The Shawnee Hills are a region within the larger Interior Low Plateaus physiographic province located in southern Illinois, southern Indiana, and western Kentucky. [1] In Illinois it rests mainly in an east–west arc roughly following the outline of the southern end of the 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.
Granite City Township is located in Madison County, Illinois, in the United States. Granite City Township was founded in 1896, close to the Mississippi River. It quickly became an industrialized city due to its access to the Mississippi River and railroads. [1] Granite City's population has long relied on its steel mill (Granite City Steel) as ...
The Mazon Creek fossils are found in the Upper Carboniferous Francis Creek Shale. [6] The type locality is the Mazon River (or Mazon Creek), a tributary of the Illinois River near Morris, Grundy County, Illinois. The 25 to 30 meters of shale were formed approximately , during the Pennsylvanian period.
Illinois has a maximum north–south distance of 390 miles (630 km) and 210 miles (340 km) east-west. Total area is 57,918 square miles (150,010 km 2), ranked 25th in size of the 50 states.