For the more information about the air resources of the National Park Service, please visit http://www.nature.nps.gov/air/.
Sica Hollow displays many facets of natural history, including the glacial story of the River Warren, pothole lakes on the upland of Coteau, grasslands and prairie, and ravines where eastern deciduous forests grow. The site includes the eastern face of the escarpment of the Coteau des Prairies.
Year designated: 1967
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