The article discusses the United States National Natural Landmarks (NNL) program, which promotes the conservation of important geological and ecological sites across the country. There are 599 NNLs, with Iowa having seven designated landmarks. These include:
- Anderson Goose Lake: A privately owned glacial pothole lake, important for waterfowl habitat.
- Cayler Prairie: A 155-acre state-owned grassland with unique flora and adjacent wetlands for wildlife.
- Cold Water Cave: An extensive cave system known for low oxygen and high carbon dioxide levels.
- Dewey’s Pasture and Smith’s Slough: A state-owned site with diverse habitats for numerous waterfowl.
- Hayden Prairie State Preserve: The largest remnant tallgrass prairie outside the Loess Hills.
- Loess Hills: A privately owned site showcasing unique loess topography.
- White Pine Hollow State Forest: Home to Iowa’s last remaining white pine.
Designations reflect geological and ecological significance, promoting public appreciation of natural heritage.
