Mazon Creek Fossil Beds

Also known as: Mazon River, Benson Farm, Fossil Bed Farm
Benson Rd., 3 mi. SE of Morris, Morris, Illinois



The Mazon Creek Fossil Beds are important in the history of U.S. geology. When they were discovered in the mid-19th century, the beds provided the best and earliest representations of the oldest plants and animals known. Sites where fragile fossils are common and well preserved (here in distinctive ironstone nodules) are exceedingly rare. The Mazon Creek beds continue to be a prolific source of fossils. -- National Historic Landmark statement of significance, September 25, 1997

National Register information 

Posted to the National Register of Historic Places on September 25, 1997
Reference number
Area of significance
Level of significance
Evaluation criteria
A - Event; B - Person
Property type
Historic function
Natural feature
Current function
Natural feature
Periods of significance
1850-1874; 1875-1899; 1900-1924; 1925-1949