Mazon River

Mazon River
Basin features
Main source	Greenfield Township, Grundy County, Illinois 41°11′02″N 88°15′13″W / 41.183921°N 88.2536703°W / 41.183921; -88.2536703 (Mazon River origin)
River mouth	Confluence with the Illinois River, Morris, Illinois 489 ft (149 m) 41°21′09″N 88°25′26″W / 41.3525319°N 88.4239563°W / 41.3525319; -88.4239563 (Mazon River mouth)Coordinates: 41°21′09″N 88°25′26″W / 41.3525319°N 88.4239563°W / 41.3525319; -88.4239563 (Mazon River mouth)
Progression	Mazon River → Illinois → Mississippi → Gulf of Mexico
Physical characteristics
Length	28 mi (45 km)
GNIS ID	413173

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The Mazon River or Mazon Creek, is a tributary of the Illinois River in the United States. The confluence is near Morris, Illinois.

The Mazon River is associated with the Mazon Creek fossils of the Francis Creek Shale, which are also exposed in strip mines and quarries near the River. This fossil bed includes well-preserved fossils from the Pennsylvanian period of the Paleozoic era and is a world-famous Lagerstätten site.

The Mazon River is approximately 28 miles (45 km) in length, with the West Fork considered the main branch.

The river was named in honor of William Mason, a pioneer settler.

The following cities, towns and villages are within the Mazon watershed:

The following counties are at least partly drained by the Mazon River:

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Wikipedia