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over the Thornton Quarry.]] Thornton Quarry is one of the largest stone Quarries in the world, located near Thornton, Illinois on the south side of Chicago . Work at the quarry began in 1924 by Colonel Hodgkins, and since 1938 has been operated by the Material Service Corporation. The quarry is 1.5 miles (2.5 km) long, 0.5 miles (1 km) wide, and 400 feet (125 m) deep As part of the Chicago Deep Tunnel project, both Thornton Quarry and McCook Quarry will serve as reservoirs to reduce the backflow of stormwater and sewage from Chicago area rivers into Lake Michigan. {Link without Title} Thornton Transitional Reservoir contributes a 3.1 billion gallon capacity to the system. The quarry contains Silurian reefs which formed when the Michigan Basin was covered in sea water more than 400 million years ago. {Link without Title} EXTERNAL LINKS
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