Red River Gorge Natural Geological Area
Red River Gorge Geological Area
Ichetucknee Springs State Park
Starved Rock State Park
Indiana Southern Lowlands, Indiana
Oquirrh + Stansbury Mountains, Utah
O'ahu, Hawai'i
North Central Gulf Coast, Florida
High Great Plains, Kansas
Indiana Southern Lowlands, Indiana
Eastern Central Till + Lowlands, Indiana
Northern Piedmont, North Carolina