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.
Year designated: 1966
Please remember, National Natural Landmarks (NNLs) are not national parks. NNLs are owned by a variety of public and private entities and allowing visitation is at their discretion. Many NNL sites maintain public websites where additional information may be found.