For the more information about the air resources of the National Park Service, please visit http://www.nature.nps.gov/air/.
Giant City Geological Area
Located within Giant City State Park, Giant City Geological Area is an exceptional example of gravity sliding, consisting of massive joint-bounded sandstone blocks of Pennsylvanian age. The site supports a rich flora including xeric oak woodlands, oak-hickory and mesic forests dominated by sugar maple.
Location: Union County, IL
Year designated: 1980
Please remember, National Natural Landmarks (NNLs) are not national parks. NNL status does not indicate public ownership, and many sites are not open for visitation.
Last Updated: June 28, 2012