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Iowa State Preserves tend to be small parcels of land with some historic or environmental significance. The arrangement is alphabetic. This is based on information found at a website maintained by the Iowa Department of Natural Resources.
Bixby State Preserve is a nature reserve located in southwestern Clayton County, Iowa, in the midwestern United States. It is located 3 miles (4.8 km) north of Edgewood . It is operated by the Iowa Department of Natural Resources as one of the Iowa state preserves .
Commemorates the site of a fort built to protect the Iowa border during the Dakota War of 1862. Geode State Park: Henry County: Danville: 1,641 664: Skunk River, Lake Geode: Features a 187-acre (76 ha) recreational reservoir and a display of geodes, the Iowa state rock. George Wyth Memorial State Park: Black Hawk County: Waterloo: 1,200 490: 1940
Bat Cave; Carter Caves State Park; Cascade Caverns; Colossal Cavern; Diamond Caverns; Eleven Jones Cave; Fisher Ridge Cave System; Glover's Cave; Goochland Cave; Great Onyx Cave; Great Saltpetre Cave; Horse Cave also known as "Hidden River Cave" Lost River Cave; Mammoth Cave; Martin Ridge Cave System; Oligo-Nunk Cave System
Maquoketa Caves State Park is a state park of Iowa, United States, located in Jackson County. It stands northwest of the city of Maquoketa . In 1991 111 acres (45 ha) on the east side of the park were listed as a historic district on the National Register of Historic Places .
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The cave system has some unusual features such as its expansion rate, which is higher than most caves. It also has relatively low amounts of oxygen and high amounts of carbon dioxide. In 1987, the Cold Water Cave was designated as a National Natural Landmark by the National Park Service. [1] There are two entries; both are on private property.
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