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Geode State Park is a state park in Henry County, Iowa bordering Des Moines County. It is managed by the Iowa Department of Natural Resources. While it is named for Iowa's state rock, the geode, few can be found in the park. A display of geodes, with their mysterious crystal formations in their hollow cavities, can be seen at the park office.
Geodes are found in southeast Iowa and are the official state rock. They consist of grey to pink cobbles within limestone that when cut or smashed open reveal a hollow crystal-filled interior. Geodes are common around Geode State Park in Henry County. [18]
Geodes are common in some formations in the United States (mainly in Indiana, Iowa, Missouri, western Illinois, Kentucky, and Utah). Geodes are also abundant in the Mendip Hills in Somerset, England, where they are known locally as "potato stones". [3] The term geode generally describes hollow formations.
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
In 1986, California named benitoite as its state gemstone, a form of the mineral barium titanium silicate that is unique to the Golden State and only found in gem quality in San Benito County. [ 80 ] ^ Colorado is the only state whose geological symbols reflect the national flag's colors: red (rhodochrosite), white (yule marble), and blue ...
The Warsaw Formation is a geologic formation in Illinois, Iowa and Missouri. It preserves fossils dating back to the Mississippian subperiod. See also
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The forest is located in the Driftless Area of Iowa, a region that was not glaciated during the last ice age. The geology of the region shows ancient Silurian period formations. The Yellow River and Paint Creek have rugged, steep walled canyons, showing millennia of erosion, where glacial action would have otherwise smoothed out the features.
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