For the more information about the air resources of the National Park Service, please visit http://www.nature.nps.gov/air/.
Comprised of deep erosion canyons with rugged rims, Rainbow Basin is an outstanding example of geologic processes. The site contains significant fossil evidence of insects, larger Miocene mammals and mammal tracks.
Location: San Bernardino County, CA
Year designated: 1966
For additional information see:
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